558 CONNECTICUT GEOL. AND NAT. HIST. SURVEY. [Bull. 



Megaspilus Westwood. 

 Habropelte Thomson. 

 °M. armatus Say. 



Black, more or less pilose. Wings fusco-hyaline, darker 

 beneath the stigma. First flagellar joint of the female three 

 times as long as the pedicel, in the male not longer than the 

 scape. Length 3.4-4 mm. 



°M. fuscipennis Ashmead. 



Differs from the preceding by the shorter first flagellar joint 

 of the female, which is less than three times the length of the 

 pedicel. In the male it is not longer than the scape. 



Lygocerus Foerster. 



°L. stigmatus Say. . ' 



Black, pubescent, finely punctulate, subopaque. Legs 



piceous-black, varied with honey-yellow. Male with the first 



five flagellar joints dentate, the first twice as long as thick. 



Length 1.4 mm. 



Parasitic on aphids on poplar and raspberry. 



°L. niger Howard. 



Differs from the preceding in having the first to seventh 

 flagellar joints of the male dentate, the first being two and one- 

 half times as long as wide. Length 1.6 mm. 



Parasitic on the wheat aphis (Siphonophora avence). 



Conostigmus Dahlbom. 



Megaspilus Westwood. 



Key to Species. 



Females. 



1. Face smooth, polished, and impunctate 2 



Face finely punctulate or shagreened 3 



2. Apex of abdomen compressed so that'it gapes open 



anomaliventris 

 Apex of abdomen normal ambiguus 



3. Wings short, reaching to middle of abdomen ottawensis 



Wings fully developed 4 



4. Face finely shagreened or punctulate S 



Face rather coarsely rugose barringtonii 



5. First three flagellar joints yellow ottawensis var. 



Flagellum entirely blackish schwartzii 



