24 U.S. NATIONAL MUSEUM BULLETIN 261 



43. Head with a tlireadlike apical process. 



35. Rhaphirrhinus Laporte (p. 157) 

 Head without such a process 44 



44. Connective very elongate, stem extending farther posteriorly 



than apex of style . . . .33. Deselvana, new genus (p. 151) 

 Connective not extending posteriorly as far as style apex. 



34. Omagua Melichar (p. 156) 



45. Hindwing with vein R2+3 entire (fig. Ig) 46 



Hindwing with vein R2+3 incomplete (exception: Molomea per- 



sonata (Signoret)) 48 



46. Length 1 7 mm. or more ; crown of head with a longitudinal carina 



laterad of each ocellus; hindleg with length of first tarsomere 

 greater than combined length of second and third tarsomeres. 



40. Cyrtodisca St^l (p. 174) 

 Length less than 14 mm.; crown of head without such carinae; 

 hindleg with length of first tarsomere equal to, or less than com- 

 bined length of second and third tarsomeres 47 



47. Head subangulate at transition from crown to face, disc of crown 



concave, clypeus flattened medially; forewing with numerous 

 shallow pits in clavus and corium (Central American species). 



49. Quichira, new genus (p. 233) 



Head with crown rounded to face, disc of crown convex, clypeus 



convex medially; forewing without such pits (South American 



species) 48. Hyogonia China (p. 230) 



48. Apex of head curved slightly dorsally and angulate at transition 



from crown to face (fig. 247b) ; male pygofer very long, exceed- 

 ing wing apices with wings at rest position. 



55. Acrogonia StSl (p. 257) 

 Without above combination of characters 49 



49. Metepimeron with shelflike projection upon which forewing rests 



when in rest position; male plates separate throughout their 



length 50 



Metepimeron without such a projection or with a very weak one; 

 male plates often fused basally 57 



50. Abdomen not constricted basally 51 



Abdomen constricted basally 56 



51. Clypeus with texture of dorsomedian area granular 52 



Clypeus with texture of dorsomedian area rugose, glabrous, or 



otherwise, but not granular 53 



52. Forewings hyaline or translucent; pygofer processes when present 



not arising on ventral margin before apex (exception: speculifera 



(Walker)) 41. Egidemia China (p. 176) 



Forewings opaque; pygofer processes arising on ventral margin 

 before apex 47, Oncometopia StM (p. 220) 



