2 PROCEEDINGS OF THE NATIONAL MUSEUM vol.71 



The genera allied to Diatraea may be separated as follows : 



KEY TO THE GENERA HERE CONSIDERED 



Fore wing with vein 7 from cell ; vein 11 anastomosing with vein 12 



1. Ocelli absent 2 



Ocelli present 6 



2. Vein 10 stalked with veins 8-9 lesta Dyar (p. 4) 



Vein 10 from cell 3 



3. Fore wing with veins 4^5 stalked ; antennae of male pectinate. 



Trinidadia Dyar and Heinrich (p. 5) 

 Fore wing with veins 4-5 not stalked ; male antennae simple 4 



4. Hind wing with veins 4-5 connate or short stalked 5 



H^nd wing with veins 3, 4, and 5 separate at end of cell. 



Hemiplatytes Barnes and Benjamin (p. 28) 



5. Labial palpi short, not exceeding the maxillary. 



Xanthopherne Dyar and Heinrich (p. 29) 

 Labial palpi very long Diatraea Guilding (p. 6) 



6. Hind wing with vein 6 arising below apex of cell, remote from veins 7-8. 



Silveria Dyar (p. 31) 

 Hind wing with vein 6 arising from apex of cell, close to veins 7-8 7 



7. Wings trigonate, normal Haimbachia Dyar (p. 32) 



Wings long and narrow Alamogordia Dyar and Heinrich (p. 38) 



GENITALIC CHARACTERS 



The genitalia of the Crambinae offer excellent characters for the 

 separation of species and to some extent (especially in the males) of 

 genera. The generic characters, however, are more in habitus than 

 definable structural differences; and are further obscured by the 

 fact that in the genus Chilo most of the types of the other allied 

 genera are repeated. We are unable to give any genitalic description 

 that will hold for all the members of the Diatraea group and exclude 

 genera with veins 11 and 12 of fore wing free or with 7 stalked with 

 8 and 9. The following general characters apply to the Crambinae 

 as a whole : 



Male genitalia with vinculum enlarged ventrally and strongly 

 chitinized. Harpe simple and elongately triangular or divided and 

 with costa produced as a free strongly chitinized arm, lobe, or hook; 

 costa most strongly chitinized part ; cucullus not differentiated from 

 median area, both areas weakly chitinized and finely haired; sac- 

 culus much reduced, rather weakly chitinized and without hair tufts 

 or strong spines, never produced as a free arm. Uncus strongly 

 chitinized, stout, broad at base; articulation to tegumen strongly 

 marked. Gnathos strongly chitinized; closely hinged to base of 

 uncus; movable; produced into a strong hook or tongue; never 

 divided. Uncus and gnathos, together, cheliform in appearance. 

 Socii absent. Transtilla absent; or represented only by its divided 



