450 AMERICAN HYMENOPTERA. 



3. Pleura with lower portion dark brown or black 4. 



Pleura bearing light or yellow pile to, or very nearly to, bases of 



legs 6. 



4. Scutellum with a large amount of yellow pile 5. 



Scutellum black crawfordi. 



5. Abdomen with some dorsal segments bearing considerable yellow 



pile on the sides 10. 



Abdomen with no segment bearing yellow pile variabilis. 



6. Area between ocelli and bases of antennae with a considerable 



amount of yellow pile 7. 



This area with little or no yellow pile 8. 



7. Abdomen entirely black intrudens. 



Abdomen with considerable yellow pile on some segments. 



insularis. 



8. Fourth dorsal abdominal segment with much yellow pile 9. 



Fourth segment with little or no yellow pile laboriosus. 



9. Apical abdominal segment very pointed and very strongly re- 



curved ; the tip of the hypopygium extending considerably 

 beyond the tip of the epipygium ; the fifth dorsal abdominal 

 segment often with considerable ferruginous pile on the sides. 



fernaldse. 



Apical abdominal segment mod^ately pointed and moderately 

 recurved ; the tip of the hypopygium extending but little 

 beyond the tip of the epipygium ; the fifth dorsal segment 



never with ferruginous pile insularis. 



10. Apical abdominal segment extremely pointed and verystrongy re- 

 curved ; the tip of the hypopygium extending considerably 

 beyond the tip of the epipygium ; the fifth dorsal abdominal 

 segment often with considerable ferruginous pile on the sides. 



fernaldae. 



Apical segment moderately pointed and moderately recurved ; the 

 tip of the hypopygium extending but little beyond the tip 

 of the epipygium ; the fifth dorsal segment never with ferru- 

 ginous pile bicolor. 



MALES. 



1. Anal segment of abdomen with a large amount of ferruginous pile 



on dorsum tricolor. 



Anal dorsal segment black or yellow 2. 



2. Pleura covered with yellow pile to the bases of the legs 3. 



Lower portion of pleura covered with dark brown or black pile.. 4. 



3. Fourth dorsal abdominal segment covered with entirely black pile. 



laboriosus. 



Fourth dorsal segment either on the sides or entirely covered with 



yellow pile 5. 



