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• The butterflies:
• Skippers
  • Spread-wing Skippers
  • Skipperlings
  • Grass-Skippers
• Spread-wing Skippers
  • Silver-spotted Skipper
  • Hoary Edge
  • Southern Cloudywing
  • Northern Cloudywing
  • Hayhurst’s Scallopwing
  • Dreamy Duskywing
  • Sleepy Duskywing
  • Juvenal’s Duskywing
  • Horace’s Duskywing
  • Mottled Duskywing
  • Funereal Duskywing
  • Columbine Duskywing
  • Wild Indigo Duskywing
  • Persius Duskywing
  • Common Checkered-Skipper
  • Common Sootywing

Dreamy Duskywing

(Erynnis icelus)

There are nine species of Duskywings that have been found in Wisconsin. From a distance of 20 yards, without binoculars, they are all essentially little black skippers. On closer inspection, the Dreamy and Sleepy can easily be distinguished from the others by a lack of white spots in the forewing. Technically this is incorrect, as the Dreamy Duskywing sometimes has a single white spot, which is lacking in the Sleepy Duskywing, although this doesn’t mean that these species are then easily distinguishable from each other. Looking at photos online of these two species has given me many headaches and provided much confusion. I am sure that there are numerous photos online and in books of these two species that have been misidentified, which is understandable given how these two species resemble each other. In fact, I am certain that I have misidentified these species, assuming that the ones in central Wisconsin were just Sleepy Duskywings as I really didn’t notice any size differences, and the habitats that I found them in were similar. It will be a priority of mine in 2006 to take as many photos of these two Duskywings as I can and try to get a better understanding of these two species.

Identifying characteristics: A small black skipper, usually described as without white apical spots in the forewing above, but that sometimes does have a single white spot, and which holds it wings spread straight out while at rest. Above, there is a postmedian band of dark markings. Below this species has two rows of light spots on both wings. This species is best described as it compares to the Sleepy Duskywing (see the discussion below).

Similar species: This species, in Wisconsin, should only be confused with the Sleepy Duskywing. In the field and in photographs these two species are very difficult to tell apart without experience with each species. Some differences include: 1) The Dreamy Duskywing is smaller than the Sleepy Duskywing, a characteristic that is difficult at best without being extremely familiar with both species. 2) The Dreamy has a more defined silvery light patch at the on the leading edge of the forewing, that is usually more obvious than in the Sleepy. This characteristic also varies greatly, and more worn Dreamy Duskywings may appear to have a less prominent silvery patch than fresh Sleepy Duskywings. 3) The Dreamy has the last segment of the palps longer than in the Sleepy, a characteristic that also varies greatly and photos are not conclusive. There are many photos online of Sleepy Duskywings that appear to have very long palps (possible misidentifications?). 4) Cech & Tudor in their book “Butterflies of the East Coast” state that the Dreamy Duskywing has a single white spot near the leading edge, even obvious in the field, that is absent in the Sleepy Duskywing. This characteristic needs more scrutiny. As far as I know, Larry Weber in “Butterflies of the North Woods” is the only other author that mentions this characteristic. How did others miss this if it is so diagnostic? Is this characteristic of all Dreamy Duskywings, or just some populations? Not all photos of Dreamy Duskywings show this white spot. Why? 5) In many books, they refer to the postmedian bands of dark markings as chainlike bands. I had no idea what they were referring to until I read “The Butterflies of North America” by William H. Howe (1975) who referred to this band having a “chain-linked” aspect. Thus the dark part of the bands can be thought of as representing the chain. This darker part of the bands is not as distinct in the Dreamy as it is in the Sleepy and usually the second, inner band is also more obvious in the Sleepy Duskywing. This seems, to me, to be the best characteristic to help differentiate fresh individuals of these two species, but worn individuals still pose identification troubles. 6) The male Dreamy Duskywing has a hair plume on the hind tibia that is lacking in the Sleepy Duskywing. This characteristic is not very useful in the field, but may be of use to document this species from a photograph. Click on the second and third photos to observe this characteristic.

Habitat: Dreamy Duskywings host plants are mainly willows and poplar in Wisconsin, and as such are often found in moister habitats than the Sleepy Duskywing. Especially when nectaring they can be found in many of the same drier habitats where Sleepy Duskywings are found. In several other states, they may also use oaks as a host plants, so more study is needed to see if they may use oak species in Wisconsin.

Flight: One brood. Usually flies slightly after the Sleepy Duskywing, but both species fly primarily during May and June. Both species have been observed in April and in July in Michigan.

Abundance: Not usually seen in large numbers and like the Sleepy Duskywing it is far more likely that you will see single individuals.

Recent Dreamy Duskywing Sightings

Date seen	County	Reported by
07–06–2008	Bayfield	Ryan Brady
07–01–2008	Bayfield	Mike Reese

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