A Dichotomous Key to Species of Erasmoneura

1. Pygofer with dorsal appendage bifurcate. Aedeagus without distal processes.

2

1'. Pygofer with dorsal appendage not bifurcate. Aedeagus with distal processes.

4

2(1). Pygofer dorsal appendage bifurcate far from base, branches very short; dorsal branch slightly curved upward.

E. vulnerata Fitch

2'. Pygofer dorsal appendage bifurcate closer to base, branches longer than basal part of appendage; dorsal branch straight or curved downward.

3

3(2). Branches of pygofer appendage subequal in length.

E. fulmina McAtee

3'. Dorsal branch of pygofer appendage about twice as long as ventral.

E. variabilis Beamer

4(1). Aedeagus with ventral processes.

E. bipentagona Beamer

4'. Aedeagus without ventral processes.

5

5(4). Third point of style apex shorter than half distance between other two points.

E. nigra Gillette

5'. Third point of style apex longer than half distance between other two points.

6

6(5). Third point of style apex more than 2X longer than distance between other two points.

E. nigerrima McAtee

6'. Third point of style apex as long as or only slightly longer than distance between other two points.

7

7(6). Ground color of dorsum dark brown or black.

8

7'. Ground color of dorsum yellow, reddish, or light brown.

9

8(7). Distal processes of aedeagus longer than dorsal distal lobe. Dorsum with pale spots.

E. atra Johnson

8'. Distal processes of aedeagus not longer than dorsal distal lobe. Dorsum without pale spots.

E. caerula Beamer

9(7). Aedeagal shaft depressed in crossection, broad in ventral view.

10

9'. Aedeagal shaft round in crossection, slender in ventral view.

12

10(9). Distal processes of aedeagus extended to or laterad of widest part of shaft in ventral view; dorsal distal lobe very short; preatrium longer than aedeagal shaft.

11

10'. Distal processes of aedeagus not extended laterad of widest part of shaft in ventral view; dorsal distal lobe longer; preatrium not longer than aedeagal shaft.

E. margaritae Dmitriev & Dietrich

11(10). Aedeagal shaft straight in lateral view, distal processes shorter, not more than 3X as long as wide in lateral view. Vertex pale; forewing yellow or pink.

E. rubricata Van Duzee

11'. Aedeagal shaft curved ventrad in lateral view, distal processes longer, more than 3X as long as wide in lateral view. Vertex and forewing reddish brown.

E. latiloba Dmitriev

12(9). Aedeagal shaft curved dorsad in lateral view; dorsal distal lobe longer than distal processes.

E. emeljanovi Dmitriev & Dietrich

12'. Aedeagal shaft curved ventrad in lateral view; dorsal distal lobe not longer than distal processes.

E. mixta Beamer