No. 22.] HYMENOPTERA OF CONNECTICUT. 69 1 



MISCOPHINI. 



This tribe is represented in the eastern United States by the 

 genus Pleno cuius. 



Plenoculus Fox. 



P. atlanticus Viereck. 



Male: length 4.5 mm. Inner margins of the eyes distinctly 

 diverging below; anterior margin of the clypeus rounded, with 

 two widely separated teeth near the middle; median furrow 

 distinct; ocelli in an acute triangle, the postocellar line subequal 

 to the ocellocular line; antennae rather short, the third, fourth 

 and fifth joints subequal in length ; head and thorax dull, finely 

 closely punctate; dorsal aspect of the propodeum finely trans- 

 versely striate, with a median longitudinal furrow ; sides of 

 the propodeum obliquely striato-granular ; abdomen dull, finely 

 granular, the apex of the three basal segments narrowly depressed. 

 Black; clypeus, mandibles (except piceous apices), scape in front, 

 tubercules, tegulse, femora beneath toward apex, and all the tibiae 

 and tarsi yellow. Wings hyaline, iridescent; venation brown. 



Poquonock, 27 June, 1905 (H. L. V.). 



BEMBECIDAE. 



In the absence of the prepectus the wasps of this family 

 resemble most of the Apoidea. 



The family Bembecidae of the present classification is the 

 Bembecidae and Stizidae of Ashmead's arrangement or the " Gat- 

 tungsgruppe " Bembex of Kohl's system. The wasps belonging 

 to this family have a habitus of their own and are easily distin- 

 guished from all other wasps by the characters used in the table. 

 They are smooth-bodied and have a transverse head. There are 

 always three cubital cells, the second of which receives both the 

 recurrent veins and in all our species is broad on the radius. 



These wasps nest in the ground and provision their nests with 

 Diptera or in one case Homoptera. Often they nest in colonies in 

 sunny, sandy places, although many of the species are solitaray in 

 their nesting habits and often very shy. Some of the shyer 

 species are very difficult to catch and offer good sport. 



The family may be divided into two well defined, but allied 

 subfamilies. The following characters will serve to separate 

 these groups : 



