BY ROWLAND E. TURNER. 79 



! 5 . Without spines on the sides of the fifth or sixth 

 ventral segments. 

 a 6 . Hypopygium rounded or truncate, with a single 

 spine. 

 a 7 . Hypopygium rounded at the apex. 

 a 8 . Abdomen black and yellow. 



a 9 . Abdomen broadly banded with yellow. 



polybioides. 44 



b 9 . Abdomen marked with yellow on the 



sides only. rostratus. 58 



b 8 . Abdomen ferruginous marked with white. 



combustus fern. 60 

 b 7 . Hypopygium truncate at the apex. 



a 8 . Hypopygium narrowly truncate; abdomen 



yellow and ferruginous. optimus Sm. 45 



b 8 . Hypopygium broadly truncate; abdomen 

 almost entirely black. 

 a 9 . Abdomen marked with yellow on the 



sides. dispersus. 56 



b 9 . Abdomen entirely black. 



a 10 . The sides of the epipygium dilated 



near the apex. zelebori Sauss. 53 



b 10 . The epipygium truncate, the sides not 

 dilated. 

 a 11 . The scutellum narrowly truncate at 



the apex. truncatus Sm. 54 



b 11 . The scutellum broadly truncate at 

 the apex. 

 a xl& . Legs black. iridipennis Sm. 55 



b 12 . Legs ferruginous. collaris Guer. 57 

 b G . Hypopygium tridentate, the apical spine much 

 the longest. 

 a 7 . Clypeus rostrate. arenicolus, 59 



b 7 . Clypeus not rostrate. 

 a 8 . Scutellum not strongly elevated in the 

 middle. 

 a 9 . Abdomen slender, the segments not 

 strongly constricted, black or black 

 and yellow. 

 a 10 . Abdomen banded with yellow. 

 a lx . The yellow bands not interrupted. 



jardinei. 47 



b 17 . The yellow bands interrupted. 





