Key to the genera of Ptiloneuridae

(Modified from García Aldrete 2006)

1. Hindwing M one-branched............................................................................. 2

-. Hindwing M two to five-branched........................................................................ 8

2. Forewing 2A joining wing margin; no crossveins between 2A and wing margin................................... 3

-. Forewing 2A joining 1A; one crossvein between 2A and wing margin; two crossveins between 1A and wing margin......................................................................................... Timnewia García Aldrete

3. Forewing areola postica high, with apex rounded............................................................. 4

-. Forewing areola postica low, very long............................................... Perucania New & Thornton

4. Labral sclerites incomplete, not reaching anterior margin of labrum.............................................. 5

-. Labral sclerites complete, reaching anterior margin of labrum.............................. Willreevesia García Aldrete

5. Forewing M three-branched, occasionally M3 forked.................................. ……………………………...6

-. Forewing M more than three-branched..................................................................... 7

6. Hypandrium formed by a central sclerite, which may bear central or lateral apophyses, with one or two smaller sclerites on each side............................................................................. Triplocania Roesler

-. Hypandrium formed by a single sclerite, with postero-lateral, slender projections................ Belicania García Aldrete

7. Forewing M four-branched............................................................. Euplocania Enderlein

-. Forewing M six-branched........................................................... Omilneura García Aldrete

8. Forewing areola postica free, high, with apex rounded........................................................ 9

-. Forewing areola postica high, rigidly triangular, joined to M by a crossvein…….................... Ptiloneuropsis Roesler

9. Forewing 2A simple, pterostigma long, smooth............................................................. 10

-. Forewing 2A with one crossvein to wing margin, pterostigma long, distinctly spurred.......... Loneuroides García Aldrete

10. Forewing M five to seven-branched; hindwing M two to five-branched.......................................... 11

-. Forewing M eight-branched; hindwing M five-branched; hypandrium a broad sclerite projected posteriorly to form a wide, almost rectangular lobe, with a dense field of setae on each postero-lateral corner; a dense field of setae on each side of central projection............................................................................ Ptiloneura Enderlein

11. Forewing M five to seven-branched; hindwing M two to five-branched; hypandrium a central sclerite with one or two smaller ones on each side; central sclerite with one central or with two lateral posterior projections; phallosome V- or Y-shaped................................................. Loneura Navás (= Brisacia Azar, Nel & Waller n. syn.; see discussion)

-. Forewing M five to six-branched; hindwing M two to four-branched; hypandrium of one sclerite, without projections. Phallo- some closed anteriorly, rounded, U-shaped, with lateral extensions of the phallobase, posterior pair of endophallic sclerites basally fused to form a V-shaped structure, each arm of the V distally forked or rounded, enclosing a membrane with numerous pores................................................................................. Brasineura n. gen.