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Juvenal's Duskywing (Erynnis juvenalis)

Detailing the physical features, habits, territorial reach and other identifying qualities of the Juvenal's Duskywing

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Image Credit: Heather H., taken in Pope County, IL
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One of many Duskywings, the Juvenal's Duskywing is a larger yet more varied species that is commonly found in eastern and southwestern states.

Updated: 01/04/2022; Authored By Staff Writer; Content ©www.InsectIdentification.org
A fast flier, Juvenal's Duskywing is hard to identify the moment its spotted. It resembles other Duskywings and a careful study of its color and pattern are needed to get a correct identification. One version looks a lot like Horace's Duskywing. Add to that, Juvenal's Duskywing individuals have variations in colors and pattern based on what region they are in. To make it even more complicated, males and females are different in color and pattern, too.

Males perch on plants low to the ground and scan for females. They may return to a familiar perch if frightened away. Adults drink nectar from dandelions as well as plum, blueberry, lilac, wisteria, and Carolina vetch blossoms. Caterpillars eat oak tree leaves. Two generations a year is typical in warmer south and southwestern states; one generation is the norm in cooler states. They can be found mainly in the spring in woodlands, forests, parks, and gardens that have at least a few oaks nearby.©InsectIdentification.org

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General Characteristics

Capability, Shape, Texture/Pattern, Benefits, Dangers
Flying insect icon

Taxonomic Hierarchy

Species Breakdown
Kingdom: Animalia
  Phylum: Arthropoda
    Class: Insecta
      Order: Lepidoptera
        Family: Hesperiidae
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          Genus: Erynnis
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            Species: juvenalis

Identifying Information

Size, Colors, Features
Scientific Name: Erynnis juvenalis
Category: Butterfly or Moth
Size (Adult; Length): 35mm to 50mm (1.37" to 1.96")
Colorwheel Graphic Colors: brown; white; ivory
Descriptors: flying

Relative Size Comparison

Typical Size Between 35mm (1.4in) and 50mm (2.0in)
Lo: 35mm
Md: 42.5mm
Hi: 50mm

Territorial Map*

U.S., Canada, and Mexico
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Territory map graphic of the country of Mexico
Contiguous United States shape map layer graphic
Prince Edward Is.  
* MAP NOTES: The territorial heat map above showcases (in red) the states and territories of North America where the Juvenal's Duskywing may be found (but is not limited to). This sort of data is useful when attempting to see concentrations of particular species across the continent as well as revealing possible migratory patterns over a species' given lifespan. Some insects are naturally confined by environment, weather, mating habits, food resources and the like while others see widespread expansion across most, or all, of North America. States/Territories shown above are a general indicator of areas inhabited by the Juvenal's Duskywing. Insects generally go where they please, typically driven by diet, environmental changes, and / or mating habits.

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