No. 22.] HYMENOPTERA OF CONNECTICUT. 693 



2. Propodeum emarginate posteriorly Bembidula p. 693 



Propodeum not emarginate posteriorly, straight or convex. . 3 



3. Anterior ocellus round or reniform; maxillary palpi 6-jointed, 



labial palpi 4-jointed Stictia 



Anterior ocellus linear; maxillary palpi 4-jointed, labial palpi 

 2-jointed Bembex p. 694 



Microbembex Patton. 



M. monodonta (Say). 



Under this name a number of distinct forms have been 

 grouped. The species has been recorded from the State and has 

 been taken in July and August. At present it is impossible to 

 tell to which form the record applies. The true monodonta is 

 black with greenish-white markings ; the pleurse black, and meso- 

 scutum also ; the wings are slightly dusky. 



Nothing has been published on the habits of these wasps. 

 Some of the western forms appear to nest in colonies, while it 

 seems probable that the eastern monodonta, nests singly or in 

 very small colonies. 



Bembidula Burmeister. 

 This genus is readily separated from the other genera of Bem- 

 becinse by the emarginate propodeum. The maxillary palpi are 

 6-jointed, the labial palpi 4-jointed. The anterior ocellus is linear 

 or transverse and curved. The habits of our species have as yet 

 not been worked out. 



Key to Species. 

 Length about 18 mm.; metanotum black; abdominal spots 



much wider at the sides quadrifasciata 



Length about 14 mm.; metanotum with yellow spots; ab- 

 dominal spots not, or but very slightly, wider at sides . . . 



ventralis 



B. quadrifasciata Say. 



Last dorsal abdominal segment of the female is ridged later- 

 ally ; intermediate femora of the male simple. 



This species is widely distributed and should occur in the 

 State. 



B. ventralis Say. 



Last dorsal abdominal segment of the female is not ridged 

 laterally ; the intermediate femora of the male are produced into a 

 tooth beneath. 



