Nikon 7900 pocket camera, hand-held image. Day six of my “Butterfly week” and it is a recent shot of a new species for me. Unfortunately I can not pin down an exact ID yet. Btw – although it does have some wing damage, it is not missing an antennae, the right side one is just turned down, lol. With 17 species in North America and 13 in Canada,the genus Erynnis (Duskywings) is probably the most difficult group of North American butterflies to identify in the field. However, the identity of a particular individual can often be narrowed to a few possibilities by noting the habitat and examining the range maps for each species. I think I have it down to two possible species. Unfortunately, the distinction between Erynnis juvenalis and E. horatius seems to partially depend upon the presence (or absence) of two spots on the underside of the hindwings and I did not see the underside. Variation is high in both species and sexual dimorphism further complicates things. On the juvenalis there are 8 to 9 small pale white spots going downward from the costal wing margin next to the large light patch near the top of the forewing - usually 4 then break then 4, or 4, then very small spot, then lower 4. In E.horatius there are only 6 small pale white spots next to the large pale forewing patch - 4 from the costal wing margin and 2 slightly lower. Notice also in horatius, the bottom 2 would-be pale spots are completely darkened (or sometimes absent in the male). These can be tricky to ID, but this is one way to help distinguish these two species. Note: Male forewing has long white hairs scattered across (need magnifying glass or strong macro), whereas horatius does not. Kingdom Animalia (Animals) Phylum Arthropoda (Arthropods) Class Insecta (Insects) Order Lepidoptera (Butterflies and Moths) Superfamily Papilionoidea (Butterflies) Family Hesperiidae (Skippers) Subfamily Pyrginae (Spread-wing Skippers) Genus Erynnis (Duskywings) Species juvenalis (Juvenal's Duskywing) Eastern half of US and adjacent Canada. Larvae feed on oaks. I also would like to mention that a lot of my posted bug info usually comes from BugGuide.com (a very very good site for North American insect species identifications). Thanks to those who take the time to comment, Lee