Horace's Duskywing

Media
Photo of a Horace's Duskywing
Scientific Name
Erynnis horatius
Family
Hesperiidae (skippers)
Description

In Horace's duskywing, both males and females have white spots on the forewing, including a white spot in the forewing cell (the oval space between veins that is toward the leading edge of the forewing, near the body); white spots are larger on females. The overall color is brown without a hint of gray. Males have a bold white line over the eye.

As a spread-winged skipper, this species most often rests with all four of the wings held out flat to the side.

Larvae are bluish green with tiny, light-colored spots; the head is brown with orange blotches around the margin; the body tapers at the end.

Similar species: The ventral (lower) side is the easiest way to separate this species from Juvenal’s duskywing (E. juvenalis): Juvenal’s has two pale spots toward the tip of the ventral hindwing. Also, by late May, the Juvenal’s duskywing has disappeared; after that, Horace’s is the only duskywing in Missouri with a white spot in the forewing cell.

Size
Wingspan: 1¼–1½ inches.
Where To Find
image of Horace's Duskywing Distribution Map
Statewide.
Flies in forest clearings and edges, brushy fields, roadsides, and yards. The adults are often seen on flowers and at mud puddles.
Larvae feed on the leaves of oaks. The adults frequent flowers that are about 4 feet tall, including buttonbush, dogbane, goldenrod, and others in the sunflower family, plus mints and mustards.
Resident with multiple broods.
Life Cycle
Flies from late March until mid-October. The life history is similar to other duskywings. Males visit puddles shortly after emerging, then perch on twigs to intercept passing females. Females lay eggs singly; caterpillars feed on young leaves, taking shelter in leaf nests when not actively feeding. Fully grown caterpillars overwinter in their nests in the leaf litter below the tree and pupate in their nests in spring.

Skippers are grouped in the same superfamily as butterflies, although in the past they have been considered separate from both butterflies and moths. Taxonomists are biologists who study the names of organisms and the relationships among them. Today taxonomists use the tool of DNA evidence to refine our knowledge.

The names of the closely related Horace's and Juvenal's duskywings reference two of ancient Rome's greatest poets and satirists. Back in the late 1800s, several other species in this genus received names based in Greek and Roman literature. Their namers, Samuel Scudder and Edward Burgess, grew up at a time when classical (ancient Greek and Latin) literature was considered the foundation for an educated mind.

The caterpillars are herbivores that graze on vegetation. The adults serve a role in pollination. All stages provide food for predators.
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About Butterflies and Moths in Missouri
Butterflies, skippers, and moths belong to an insect order called the Lepidoptera — the "scale-winged" insects. These living jewels have tiny, overlapping scales that cover their wings like shingles. The scales, whether muted or colorful, seem dusty if they rub off on your fingers. Many butterflies and moths are associated with particular types of food plants, which their caterpillars must eat in order to survive.