Erynnis icelus

{{Short description|Species of butterfly}}

{{Speciesbox

| name = Dreamy duskywing

| image = Dreamy Duskywing.jpg

| status = G5

| status_system = TNC

| status_ref = {{cite web |title=NatureServe Explorer 2.0 Erynnis icelus Dreamy Duskywing |url=https://explorer.natureserve.org/Taxon/ELEMENT_GLOBAL.2.111347/Erynnis_icelus |website=explorer.natureserve.org |accessdate=27 September 2020}}

| taxon = Erynnis icelus

| authority = (Scudder & Burgess, 1870)

| synonyms = {{hidden begin|title = List}}

• Nisoniades icelus Scudder & Burgess, 1870
• Nisoniades icelus Lintner, 1872
• Nisoniades bautista Plötz, 1884
• Nisoniades hamamaelidis Scudder, 1889
• Thanaos icelus (Scudder & Burgess, 1870)

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Erynnis icelus, also known as the dreamy duskywing or aspen dusky wing, is a species of butterfly in the family Hesperiidae. It is found in boreal North America.

The wingspan is 29–38 mm. There is one generation with adults on wing from April to early July. There might be a rare second generation in the southern Appalachian Mountains.{{citation needed|date = February 2019}}

The larvae are pale green with multiple white dots. Its heart is visible as a green, middorsal stripe.{{cite book |last1=Wagner |first1=David L. |title=Princeton Field Guide to Caterpillars of Eastern North America |date=25 July 2005 |publisher=Princeton University Press |isbn=0691121443 |page=63}}

The larvae feed on Salix, Populus and sometimes Betula species. Adults feed on nectar from flowers of blueberry, wild strawberry, blackberry, Labrador tea, dogbane, New Jersey tea, winter cress, purple vetch and lupine.{{citation needed|date = February 2019}}