No. 22.] HYMENOPTERA OF CONNECTICUT. 659 



5. Petiole shorter than hind femora pauper 



Petiole as long as hind femora cressoni 



°P. (Mimesa) niger Packard. 



Black; wings dusky; tarsi brownish. 

 °P. (M.) kohlii (Fox). 



Black ; tarsi testaceous ; wings hyaline ; pygidium narrow, with 

 large separate punctures. 



®P. (M.) myersianus Rohwer. 



Similar to kohlii but smaller and more shining. 

 °P. (M.) nigrescens Rohwer. 



Black ; flagellum beneath and tarsi testaceous ; wings hyaline ; 

 slender ; petiole shorter than hind femora. 



P. (M.) pauper (Packard). 



Black; flagellum beneath and tarsi testaceous; second and 

 third abdominal segments red. 



Prospect, 15 August, 1906 (W. E. B.). 



P. (M.) cressoni (Packard). 



First (beyond petiole), second, third and base of fourth 

 abdominal segments red; wings hyaline; flagellum beneath and 

 tarsi testaceous, 



Salisbury, 29 August, 1904; Westville, 9 September, 1907 

 (W. E. B.). 



OXYBELIN^. 



The wasps belonging to this subfamily are easily separated 

 from all other Sphecoid wasps by the remarkable processes on 

 the dorsum of the thorax and by having the first cubital and first 

 discoidal cells confluent. The wasps nest in sand and provision 

 their nests with flies. 



• Key to Genera. 



Process at dorsal middle of propodeum broad and deeply 



emarginate at tip Notoglossa p. 660 



Process at dorsal middle of propodeum spine-like, acute at 

 apex Oxybelus p. 659 



Oxybelus Latreille. 



O. quadrinotatus Say. Howard, Insect Book, PI. iii. 

 Fig. 22. 



Length about 6 mm. ; squamae curved ; abdomen shining, 

 sparsely punctate ; wings hyaline. For an account of the habits of 



