417 



8. Fore femora mostly brown, fore and hind tibial entirely so (female) 

 or brown at bases and apices (male) 8. nepJiopterus. 



— Fore femora at apices, fore and hind tibiae at bases, and the latter 



at apices brown 9. tceniapennis. 



GROUP B 



Wings witJiout spots or hands, at most with 

 the cross vein infuscated 



Section I 



Abdominal segments in both sexes with 

 depression on dorsal surface 



The only species in this section has a distinct depression on basal 

 half of dorsal sej?ments 2 to 7 in both sexes which is slightly 

 dilated posteriorly except on 6 and 7, where it is more elongated 

 and parallel-sided 10. lobiferus. 



Section II 

 Abdominal segments without dorsal depression 



Subsection 1 



Fore tarsi witli the basal joint not more 

 than 1.5 as long as fore tibia' 



1. Femora dark brown, the mid and hind pairs each with preapical 



yellow band 2 



— Femora either unicolorous black, yellow, or yellow with apices dark- 



ened, never with pale preapical band 3 



2. Fore femora with preapical yellow band ; hind tibige with central 



brown band in addition to the brown on bases and apices; male 

 fore tarsi with long hairs, the basal joint slightly longer than fore 

 tibiffi 11. flavicingula. 



— Fore femora without preapical yellow band ; hind tibiae without cen- 



tral brown band; male fore tarsi without long hairs, basal joint 

 more than a third longer than fore tibige 12. devinctus. 



3. Black species; thorax entirely black or blackish bro^^^l, with or 



without distinct shining vittfe ; abdomen rarely yellow 4 



— Thorax with the ground color yellow or green ; abdomen variable in 



color but never entirely black 27 



4. Males 5 



— Females 17 



5. Thorax deep black ; at least the basal half of abdomen pale green or 



whitish 6 



