220 CHAS. A. BLAKE. 



Small; length 4 lines 23. Zelaya- 



Second abdominal segment reddish-brown with a broad orange band 

 on posterior half, slightly interrupted medially; first segment 

 black with a reddish-brown band, remainder black. ...41. Castor. 

 Second segment (only) ferruginous, remainder black. 



Head larger than usual, quadrate, vertex very broad behind the 



eyes; marginal cell lanceolate, pointed at apex 18. scseva. 



Head small and of the usual form. 



Second abdominal segment bright orange-ferraginous above and 

 beneath, with short eoccineous pubescence, apical margin fringed 

 with black ])ube3eence ; first segment flattened; marginal cell 



short, broadly truncate at tip 43. Bexar. 



Second abdominal segment ferruginous ahoveavd beneath, g(^x\era.\\y 

 paler on posterior half, sometimes forming two large yellow spots, 

 with golden pubescence, except at extreme base and apex where 

 it is black; first segment nodose; marginal cell truncate at 



tip 42. fenestrata. 



Second abdominal segment above yellow, with long dense yellow 

 pubescence, beneath black; remainder of abdomen above with 

 long black pubescence; first segment nodose; marginal cell 



truncate at tip 45. macra. 



Second abdominal segment above ferruginous, with black pubes- 

 cence, fuscous at base and apex and slightly so medially ; be- 

 neath black; first segment nodose; marginal cell broadly 



rounded at apex 47. canella. 



Head and thorax black, sparsely mixed with glittering pubescence. 

 Second segment of abdomen ferruginous, with black pubescence, be- 

 neath with a broad longitudinal black band; wings fuscous, 

 marginal cell broad and broadly rounded at apex. .48. macilenta. 

 Abdomen, except first segment, ferruginous, with black pubescence, 

 dense on apical margin of segments, apical segment with pale 



golden pubescence , 49. obscura. 



Abdomen black, with pale glittering pubescence; a broad band, more 

 or less distinctly defined, of pale glittering pubescence, behind 

 second segment ; wings subhyaline, marginal cell lanceolate, not 



abrupt at apex 50. gibbosa. 



Head entirely black, mesothorax and scutellum with fulvous pubescence ; 

 second abdominal segment with two large apical yellow 



spots 37. bioculata. 



Head and prothorax above, mesothorax and scutellum entirely, with 

 ferr\jginous or fulvous pubescence. 

 First and second abdominal segments (except apex) black. 



Large; apex of second and the following segments of abdomen with 



ferruginous pubescence 24. Comanche. 



Medium ; apex of second and the following segments of abdomen 



with long, dense, bright fulvous pubescence 2S<. fulvohirta. 



Medium; apex of second and the following segments of abdomen 



with long, dense, bright scarlet pubescence 32. coccineohirta. 



Abdomen black, pex of second, the third and two apical segments with 

 dense scarlet pubescence 34. occidentalis. 



