No. 22.] HYMENOPTERA OF CONNECTICUT. 633 



As this key is founded only on the females the following 

 tabulation based on easily recognized characters is given. 



Key to Species. 



1. Abdomen marked with reddish yellow atrox 



Abdomen entirely black 2 



2. Posterior margin of pronotum arcuately emarginate 3 



Posterior margin of pronotum angulately emarginate 5 



3. Third cubital cell triangular; wings darker apically; length 



about 12 mm tenebrosus 



Third cubital cell not triangular, although narrowed above; 

 wings nearly uniformly black; length more than 16 mm. . . 4 



4. Clypeus of female deeply emarginate; last dorsal abdominal 



segment of male regularly, rather narrowly rounded, .aethiops 

 Clypeus of female gently incurved; last dorsal abdominal seg- 

 ment of male broadly rounded and sightly emarginate 



relativus 



5. Wings much darker apically; tarsal comb of female obsolete 



virginiensis 

 "Wings nearly uniformly blackish; tarsal comb of female 

 present 6 



6. Large, 12 mm. or more in length; clypeus of female deeply 



emarginate philadelphicus 



Small, 10 mm. or less in length ; clypeus of female gently 

 incurved 7 



7. Tarsal claws of male cleft; apical ventral abdominal segments 



of male with much erect hair; abdomen bluish; prothorax 



of female almost nude luctuosus 



Tarsal claws of male toothed; apical ventral abdominal 

 segments of male without erect hair; abdomen black; 

 prothorax of female with much black erect hair . . . . scelestus 



P. (Anoplius) virginiensis Cresson. 



Recorded from the State, but without definite locality. 



P. (Psammochares) luctuosus Cresson. 



Said to occur all over the State. New Haven, 30 June, 1905 

 (B. H. W.) ; Colebrook, 21 July, 1905 (H. L. V.) ; New Canaan, 

 14 September, 1905 (W. E. B.). 



P. (P.) relativus Fox. 



Branford, 19 September, 1904 (H. W. W.). 



P. (P.) scelestus Cresson. 



Recorded from Connecticut and probably was collected at 

 Farmington by Norton ; New Haven, 18, 24 June, 1902 (E. J. 

 S. M.). 



