22 U.S. NATIONAL MUSEUM BULLETIN 261 



21. Forewing with an anteapical discal plexus of veins. 



8. Mareba Distant (p. 60) 

 Forewing without an anteapical discal plexus of veins. ... 22 



22. Antennal ledges not foveate; pygofer with two pairs of processes 



each resembling a clump of setae (fig. llOj). 



22. Cicciana Metcalf (p. 115) 

 Not as above 23 



23. Crown of head with a median fovea; forewing with anteapical 



supernumerary veins to costa; male plates separate throughout 



their length 24 



Crown of head without a median fovea; forewing without such 

 veins; male plates occasionally fused in basal half their length 26 



24. Clypeus in profile bulbously expanded (fig. 112b) 25 



Clypeus in profile not expanded . . 25. Acrocampsa StSl (p. 123) 



25. Male pygofer moderately produced, posterior margin concave; 



style truncate apically 24. Yotala Melichar (p. 122) 



Male pygofer strongly produced, posterior margin not truncate; 

 style not truncate apically. . 23. Peltocheirus Walker (p. 1 18) 



26. Male plates fused in basal half their length. 



53. Anacuerna, new genus (p. 253) 

 Male plates separate throughout their length. 



52. Cuerna Melichar (p. 251) 



27. Crown of head inflated . . . . . 31. Ochrostacta StM (p. 145) 

 Head not so 28 



28. Male abdominal conjunctiva IX-X in caudal aspect with a pair 



of sclerites (fig. 74j) 29 



Male abdominal conjunctiva IX-X without sclerites 30 



29. Male plates fused basally; aedeagus with an unpaired ventral 



process in apical half ... 14. Depanana, new genus (p. 85) 



Male plates separate throughout their length; aedeagus with 



paired processes only ... 15. Depanisca, new genus (p. 87) 



30. Head produced apically in a broad troughlike or scooplike process 



(fig. 127a) 28. Ichthyobelus Melichar (p. 135) 



Head with or without apical process; when present not as 

 above 31 



31. Head with a distinct apical process. 



29. Catorthorrhinus Fowler (p. 140) 

 Head without an apical process 32 



32. Male plates fused basally; paraphyses absent. 



13. Procama, new genus (p. 83) 



Male plates separate throughout their length; paraphyses 



present 33 



