Hodges # 8739
This species is often difficult to tell apart from Caenurgina crassiuscula in photos. I’ve done my best with my photos. The following characters can help to differentiate them:
Caenurgina crassiuscula is very brown, with a brownish ground color. It lacks white edging to the outer margin of the PM blotch-line. Inner (basal) band touches inner margin. Two dark bands nearly touch each other near the midline.
Caenurgina erechtea is mouse gray. The two dark bands don’t touch near the midline, and the inner band (basal) doesn’t touch the inner margin. On males the AM line inner boundary is curved outward well before the inner margin. In C. crassiuscula it is pretty straight. (from Jerry Fauske and Bugguide)