Sleepy Duskywing
(Erynnis brizo)
Sleepy Duskywing sightings, by week (about)
Click to enlargeWest of Wazee Park, Jackson Co., WI, May 7, 2005.
Click to enlargeSandhill Wildlife Area, Wood Co., WI. May 22, 2005.
Click to enlargeWest of Wazee Park, Jackson Co., WI, May 7, 2005.
The Sleepy Duskywing is one of the earliest butterflies, not hibernating as adults, on the wing in the spring and has been seen as early as April 9 in Michigan. In central Wisconsin they are most often seen flying in May and become scarce in June. This species and the Dreamy Duskywing are easily distinguished from the other Duskywings by the lack of white spots near the leading edge of the forewing above. I most often see this species flying with the Juvenal’s Duskywing, which is larger and has fairly large, offset white spots.
Identifying characteristics: A black or dark brown skipper without white spots near the leading edge of the forewing, a postmedian band of lighter coloring surrounded by black markings that form an irregular chain-link pattern. This same pattern occurs as another band, not so distinct, closer towards the body. The hindwing above has two rows of light dots that are also present below.
Similar species: The Sleepy Duskywing should only be confused with the Dreamy Duskywing. See the discussion about the differences between these two species on the Dreamy Duskywing page.
Habitat: Forest edges, open woodlands, and oak barrens where its larval host plants, various species of oaks, are found.
Flight: One brood. Flies mainly in May and June, but may occasionally be seen in April and early July.
Abundance: More common than the Dreamy Duskywing in the southern half of the state, but unlikely to see more than 1–2 at once, unless there is a terrific
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Sleepy Duskywing
Erynnis brizo