Geographic Range
        
         Erynnis persius
        
        , or the
        
         Persius duskywing
        
        , also known as the
        
         hairy duskywing
        
        , is found coast to coast in North America. The eastern subspecies,
        
         Erynnis persius persius
        
        , is found sparsely in the northern states from southeastern Minnesota to Maine and
            south into the Appalachians in Virginia. Another subspecies,
        
         Erynnis persius borealis
        
        , has a more western distribution, being found from the western Dakotas and Manitoba
            west to Alaska and south to New Mexico and California.
        
Habitat
        
         Erynnis persius
        
        is found in open woodlands, mountain grassland, marshes, sand plains, seeps, and
            alongside streams.
        
         Eyrnnis persius persius
        
        is found in areas where its larval host plant, the wild blue lupine (
        
         Lupinus perennis
        
        ) occurs. This includes sandy areas within oak savannas and pine barrens.
        
- Habitat Regions
- temperate
- terrestrial
- Terrestrial Biomes
- savanna or grassland
- forest
- Wetlands
- marsh
- Other Habitat Features
- urban
- suburban
- agricultural
- riparian
Physical Description
Erynnis persius is a member of the family Hesperiidae , a type of butterfly called skippers, that is small and very dark. The wings are rounded with a wingspan of 29 to 42 mm, with a brown-black upperside and a lighter underside. The upper forewings have light markings that look grey and mottled near the tip and a row of translucent spots before the mottled grey. They have a robust body and antennae are slender with a hooked club tip. Males have dark hindleg plumes and raised white hairs on the forewing. Males also have yellow scent scales in a costal fold. Females have a more predominate mottle grey color on the tip of the forewing and larger translucent spots near the middle of the forewing, which are diminished or absent on the male. Females have a patch of scent cells on the seventh abdominal segment.
        
         Erynnis persius
        
        resembles many other duskywing species and care should be taken with identification
            in regions of overlapping range.
        
Eggs are pale yellow-green or pale yellow and will turn reddish.
Larvae are pale green with tiny white dots, with a dark green middorsal line and yellowish dorsal line. The head is yellowish to dark reddish brown.
        Pupae are a dull, olive green, mottled with pale dots. The abdomen is pinkish brown.
        
- Other Physical Features
- ectothermic
- heterothermic
- bilateral symmetry
- Sexual Dimorphism
- sexes colored or patterned differently
Development
        Like other species of butterflies, Persius duskywings undergo complete metamorphosis.
            Females will lay a single egg under the host plant leaf. Once the egg hatches, the
            larvae (commonly known as caterpillars) will eat leaves of the host plant and live
            in nests of rolled or tied leaves. Full grown larvae will hibernate in shelters made
            of leaves and pupate in early spring or as late as July, eventually emerging as adults.
        
- Development - Life Cycle
- metamorphosis
Reproduction
        Males perch on hilltops, low vegetation, twigs, or bare spots to wait for receptive
            females. Once a female passes the male, he will pursue her and both will hover near
            each other. The male will hover over the female until she eventually lands, and the
            male will continue to hover over her until he also lands and they then mate. Both
            males and females have scent cells on them (the male on his wings and the female on
            her abdomen). These likely produce pheromones and play a role in attracting mates.
            There is limited knowledge on the dispersal behavior of females after mating.
        
        Persius duskywings produce one brood annually with one flight season from April to
            June. A single egg is laid on the underside of a leaf on the host plant.
        
- Key Reproductive Features
- seasonal breeding
- gonochoric/gonochoristic/dioecious (sexes separate)
- sexual
- fertilization
- oviparous
        Females provide provisioning in the eggs, as well as lay the eggs on a host plant.
            This host plant will provide food for the hatched larvae. Otherwise,
        
         Erynnis persius
        
        provides no further parental care, never returning to the egg or offspring after
            ovipositiing.
        
- Parental Investment
- 
         
          pre-hatching/birth
         
         - 
           
            provisioning
           
           - female
 
 
- 
           
            provisioning
           
           
Lifespan/Longevity
        The specific lifespan for
        
         Erynnis persius
        
        is not known, but like many butterfly species, it likely lives a few days to several
            weeks after emerging from pupation as an adult. Butterflies are susceptible to harsh
            weather conditions and can be killed by hail and freezing temperatures.
        
Behavior
        
         Erynnis persius
        
        are motile insects and spend much of their time flying. They are diurnal. Males are
            not territorial. Adults are often seen flying near wild lupine and will fly erratically
            when startled.
        
- Key Behaviors
- flies
- diurnal
- motile
- hibernation
Communication and Perception
        Persius duskywings use pheromones to communicate, particularly during courtship. Males
            and females have scent cells, on their wings and abdomen, respectively. While there
            is little information available for this species, it is likely that these skippers
            use vision, touch, and chemoreception to gather information about their environment.
        
- Other Communication Modes
- pheromones
Food Habits
        Adults feed on nectar from a variety of plants and flowers. Historically,
        
         E. persius
        
        larvae were thought to feed primarily on various species of willow,
        
         Salix
        
        spp., and poplar,
        
         Populus
        
        spp. However, current research shows that these are not the host plant persius duskywing
            are dependent on. The larval form of
        
         E. persius persius
        
        is dependent on the wild blue lupine,
        
         Lupinus perennis
        
        , as a host plant. It may also use wild indigo species,
        
         Baptisia
        
        spp. The western population of
        
         E. persius
        
        utilizes members of the pea family,
        
         Fabaceae
        
        , as a larval host plant.
        
- Primary Diet
- herbivore
- Plant Foods
- leaves
- nectar
Predation
        Predators of butterflies are typically other arthropods including spiders, ant, wasps,
            and some beetles. Vertebrates such as lizards, frogs, toads, rodents, and birds will
            also prey upon butterflies. To defend against ground predators,
        
         Erynnis persius
        
        can simply fly away. Additionally, butterflies in general produce odor. Unpleasant
            odors can provide protection from predators.
        
Ecosystem Roles
        
         Erynnis persius
        
        is prey to a variety of vertebrate and arthropod predators. Butterflies play a small
            role in pollination of some flowers as they gather nectar, but are typically very
            inefficient. The presence or absence of certain butterflies can be used as an indication
            of ecosystem health.
        
- Ecosystem Impact
- pollinates
Economic Importance for Humans: Positive
        Some butterfly species may help in pollination. Any economic importance for
        
         E. persius
        
        is not reported specifically. However, the decline in population numbers of
        
         E. persius persius
        
        has encouraged many eastern states to conduct research on the presence and status
            of this subspecies.
        
- Positive Impacts
- research and education
Economic Importance for Humans: Negative
        Larvae of some butterfly species can be a nuisance to cultivated plants through the
            defoliation of the leaves of those plants, though there is nothing to suggest that
        
         Erynnis persius
        
        is one such species.
        
Conservation Status
        
         Erynnis persius borlealis
        
        is secure in most of its range, however,
        
         E. persius persius
        
        is vulnerable to presumed extirpated in most of its range. Persius duskywings are
            in severe decline across their eastern range and apparently extirpated in Ontario.
        
         Erynnis persius persius
        
        has Endangered status under state laws in Connecticut, Massachusetts, Minnesota,
            New Hampshire, New York, and Ohio. It is also listed as threatened in Michigan.
        
        One cause for the decline of Persius duskywings is suppression of fire that has allowed
            for dense woodland and forest to overtake areas of open oak scrub land that they depend
            on for lupine growth. As areas are shaded through natural succession, lupine growth
            is limited and consequently
        
         E. persius
        
        habitat is decreased. Additionally, much of their open savanna habitat has been destroyed
            or degraded by urban and agricultural development. Fragmentation of its habitat has
            also played a role in its decline. Pesticide spraying for the control of gypsy moths
            has also been linked to the decline of
        
         E. persius persius
        
        in New England.
        
Additional Links
Contributors
Bridgett Winkels (author), Minnesota State University, Mankato, Robert Sorensen (editor), Minnesota State University, Mankato, Angela Miner (editor), Animal Diversity Web Staff.
- Nearctic
- 
          living in the Nearctic biogeographic province, the northern part of the New World. This includes Greenland, the Canadian Arctic islands, and all of the North American as far south as the highlands of central Mexico.   
- native range
- 
          the area in which the animal is naturally found, the region in which it is endemic. 
- temperate
- 
          that region of the Earth between 23.5 degrees North and 60 degrees North (between the Tropic of Cancer and the Arctic Circle) and between 23.5 degrees South and 60 degrees South (between the Tropic of Capricorn and the Antarctic Circle). 
- terrestrial
- 
          Living on the ground. 
- tropical savanna and grassland
- 
          A terrestrial biome. Savannas are grasslands with scattered individual trees that do not form a closed canopy. Extensive savannas are found in parts of subtropical and tropical Africa and South America, and in Australia. 
- savanna
- 
          A grassland with scattered trees or scattered clumps of trees, a type of community intermediate between grassland and forest. See also Tropical savanna and grassland biome. 
- temperate grassland
- 
          A terrestrial biome found in temperate latitudes (>23.5° N or S latitude). Vegetation is made up mostly of grasses, the height and species diversity of which depend largely on the amount of moisture available. Fire and grazing are important in the long-term maintenance of grasslands. 
- forest
- 
          forest biomes are dominated by trees, otherwise forest biomes can vary widely in amount of precipitation and seasonality. 
- marsh
- 
          marshes are wetland areas often dominated by grasses and reeds. 
- urban
- 
          living in cities and large towns, landscapes dominated by human structures and activity. 
- suburban
- 
          living in residential areas on the outskirts of large cities or towns. 
- agricultural
- 
          living in landscapes dominated by human agriculture. 
- riparian
- 
          Referring to something living or located adjacent to a waterbody (usually, but not always, a river or stream). 
- ectothermic
- 
          animals which must use heat acquired from the environment and behavioral adaptations to regulate body temperature 
- heterothermic
- 
          having a body temperature that fluctuates with that of the immediate environment; having no mechanism or a poorly developed mechanism for regulating internal body temperature. 
- bilateral symmetry
- 
          having body symmetry such that the animal can be divided in one plane into two mirror-image halves. Animals with bilateral symmetry have dorsal and ventral sides, as well as anterior and posterior ends. Synapomorphy of the Bilateria. 
- metamorphosis
- 
          A large change in the shape or structure of an animal that happens as the animal grows. In insects, "incomplete metamorphosis" is when young animals are similar to adults and change gradually into the adult form, and "complete metamorphosis" is when there is a profound change between larval and adult forms. Butterflies have complete metamorphosis, grasshoppers have incomplete metamorphosis. 
- seasonal breeding
- 
          breeding is confined to a particular season 
- sexual
- 
          reproduction that includes combining the genetic contribution of two individuals, a male and a female 
- fertilization
- 
          union of egg and spermatozoan 
- internal fertilization
- 
          fertilization takes place within the female's body 
- oviparous
- 
          reproduction in which eggs are released by the female; development of offspring occurs outside the mother's body. 
- diurnal
- 
          - active during the day, 2. lasting for one day.
 
- motile
- 
          having the capacity to move from one place to another. 
- hibernation
- 
          the state that some animals enter during winter in which normal physiological processes are significantly reduced, thus lowering the animal's energy requirements. The act or condition of passing winter in a torpid or resting state, typically involving the abandonment of homoiothermy in mammals. 
- visual
- 
          uses sight to communicate 
- chemical
- 
          uses smells or other chemicals to communicate 
- pheromones
- 
          chemicals released into air or water that are detected by and responded to by other animals of the same species 
- visual
- 
          uses sight to communicate 
- tactile
- 
          uses touch to communicate 
- chemical
- 
          uses smells or other chemicals to communicate 
- herbivore
- 
          An animal that eats mainly plants or parts of plants. 
- nectarivore
- 
          an animal that mainly eats nectar from flowers 
References
Barton, B. 2007. "Special animal abstract for Persius duskywing ( Erynnis persius persius ). Michigan Natural Features Inventory. Lansing, MI. 2 pp." (On-line). Accessed March 28, 2013 at http://mnfi.anr.msu.edu/abstracts/zoology/Erynnis_persius_persius.pdf .
Macy, R., H. Shepard. 1941. Butterflies: A handbook of the butterflies of the United States, Complete for the Region North of the Potomac and Ohio Rivers and East of Dakotas . Minneapolis: The University of Minnesota Press.
Minnesota Department of Natural Resources, 2013. " Erynnis persius (Scudder, 1863) Persius Duskywing" (On-line). Accessed March 24, 2013 at http://www.dnr.state.mn.us/rsg/profile.html?action=elementDetail&selectedElement=IILEP37170 .
NatureServe, 2013. "NatureServe Explorer: An online encyclopedia of life [web application]. Version 7.1. NatureServe, Arlington, Virginia" (On-line). Accessed March 26, 2013 at http://www.natureserve.org/explorer/servlet/NatureServe?sourceTemplate=tabular_report.wmt&loadTemplate=species_RptComprehensive.wmt&selectedReport=RptComprehensive.wmt&summaryView=tabular_report.wmt&elKey=118199&paging=home&save=true&startIndex=1&nextStartIndex=1&reset=false&offPageSelectedElKey=118199&offPageSelectedElType=species&offPageYesNo=true&post_processes=&radiobutton=radiobutton&selectedIndexes=118199&selectedIndexes=120580&selectedIndexes=740442&selectedIndexes=120042 .
Opler, P., L. Kelly, N. Thomas. 2012. "Butterflies and Moths of North America" (On-line). Accessed March 25, 2013 at http://www.butterfliesandmoths.org/species/Erynnis-persius .
Scott, J. 1986. The Butterflies of North America . Stanford, CA: Stanford University Press.
Shepherd, M. 2005. "Skippers: Persius duskywing ( Erynnis persius persius )" (On-line). The Xerces Society for Invertebrate Conservation. Accessed March 24, 2013 at http://www.xerces.org/persius-duskywing/ .
Shuey, J., J. Calhoun, D. Iftner. 1987. Butterflies that are Endangered, Threatened, and of Special Concern in Ohio. Ohio J. Sci. , 87 (4):: 98-106.
