■UNITED STATES NATIONAL MUSEUM BULLETIN 207 



Hind wing with vein 3 closely approximate to or from the angle of cell; veins 7-8 approxi- 

 mate or very weakly and shortly anastomosed beyond cell; 2 and 3 both long, the 

 divergent element of 3 nearly as long as 2; cell distinctly less than halt the length of 

 wing Venational division D (key, p. 8) 



Venational division B 



1. Hind wing with discoceUular vein oblique 2 



Hind wing with discoceUular vein ciirved 3 



2. Forewing with subbasal ridge of raised scales; hind wing with cell somewhat less than 



one-third the length of the wing; eighth abdominal segment of male with midven- 



tral hair tuft Mildrixia (p. 26) 



Forewing smooth; hind wing with cell one-fifth the length of the wing; eighth abdominal 

 segment of male with sternite developed as a sclerotized, digitate pocket. 



Drescoma (p. 88) 



3. Hind wing with vein 3 from before, but near, lower outer angle of cell 4 



Hind wing with vein 3 from the angle or the stalk of veins 4-5 8 



4. Hind wing with veins 4-5 connate; vein 6 of forewing always straight 5 



Hind wing with veins 4-5 approximate, contiguous, anastomosed or stalked for a short 



distance from ceU, if sometimes connate (on individuals of Hypsipyla) vein 6 of fore- 

 wing slightly bent towards base 6 



5. Basal segment of male antenna triangulate Acrobasis (p. 11) 



Basal segment of male antenna simple (cyHndrical) Rhodophaea " (p. 24) 



6. Forewing with subbasal ridge of raised scales; antenna of male pubescent (cUia distinctly 



shorter than width of shaft) Anabasis (p. 25) 



Forewing smooth; antenna of male ciHate (cUia distinctly longer than width of shaft) . 7 



7. Forewing with vein 6 straight, remote from veins 8-9 at base . . Sematoneura (p. 27) 

 Forewing with vein 6 bent, shortly separated from 8-9 at base . . . Hypsipyla (p. 27) 



8. Vestiture of head, thorax, labial palpi, and femora a mixture of scales and hairs; male with 



harpe short (stubby), clasper absent, apical process of gnathos an inverted heart- 

 shaped lobe with short, slender spine; female with ventral surface of genitalia sclero- 

 tized throughout its length, ductus seminalis from near junction of bursa and ductus 



bursae Polopeustis (p. 120) 



Vestiture entirely of scales; or, if occasionally mixed with hair (Sarata atrella), male with 

 harpe elongate, clasper present, knoblike, apical process an elongate, stout hook; 

 female with ductus bursae unsclerotized, ductus seminaHs from bursa remote from 

 junction of bursa and ductus bursae 9 



9. Forewing with subbasal ridge of raised scales 10 



Forewing smooth 16 



10. Hind wing with vein 3 from the stalk of veins 4-5 Passadena (p. 175) 



Hind wing with vein 3 approximate to but not from the stalk of veins 4-5 11 



11. Labial palpus porrect, beaklike Etiella (p. 98) 



Labial palpus oblique or upturned 12 



12. Forewingwith vein 6 from the upper angle of the cell, bent towards base 



Hypargyria (p. 37) 

 Forewing with vein 6 from well below the angle of cell, straight 13 



13. Forewing with veins 4 and 5 sHghtly separated at base and approximate for a short dis- 



tance beyond ■,-,, 14 



Forewing with vein^ 4 and 5 connate or stalked ; if sometimes shortly separated at base 

 not approximate beyond 15 



' The genus Trachycera is omitted from our key as the male is unknown except from Ragonot's descrip- 

 tion. The female before me has the venation of Rhodophaea. It is distinguished from other females of 

 Division B in having two scobinate, cuplike signa similar to those of Davara in division D. (See p. 25.)]"; 



