No. 22.] HYMENOPTERA OF CONNECTICUT. 559 



C. anomaliventris Ash mead. 

 Black, shining, head and thorax finely alutaceous. Antennae 

 brown-black. Legs reddish yellow, the posterior coxae dark at 

 base. Tip of abdomen in female compressed, widely gaping 

 open so that the valves of the ovipositor project. Length 2.5 

 mm. 



C. ambiguus Ashmead. 



Black, shining, finely alutaceous. Scape and legs brownish 

 yellow, the posterior coxae dark basally. Wings nearly hyaline, 

 the stigmal vein less than twice the length of the stigma. Length 

 1 .2-1.6 mm. 



C. schwartzii Ashmead. 



Black, finely shagreened, the scutellum smooth. Scape and 

 legs brownish yellow, antennal scape brownish yellow, the 

 flagellum piceous. Wings hyaline, the stigmal vein one and one- 

 half times as long as the stigma. Length 1.6 mm. 



Sachem's Head, 3 August, 1904, West Haven, 27 June, 1905, 

 New Haven, 4 July, 1905 (H.L.V.). 

 C. harringtonii Ashmead. 



Black, the head and thorax with a fine reticulate punctation. 

 Legs dull yellow ; the posterior coxae black and the others dusky. 

 Scape and pedicel yellow, flagellum black. Length 2-2.5 mm - 



C. ottawensis Ashmead. 



Smooth, shining black. Scape, pedicel, and first three flagellar 

 joints yellow. Legs honey-yellow. Wings usually short, reach- 

 ing only to the middle of the abdomen, but sometimes well 

 developed. Length 2-2.5 mm - 



Eumegaspilus Ashmead. 



E. erythrothorax Ashmead. 



Head and abdomen black or fuscous. Face, scape, thorax 

 and petiole rufous or brownish yellow. Legs pale yellow. Wing- 

 less. 



In nest of Lasius umbratus tnixtus aphidicola. 



Colebrook, August, 1900 (W. M. W.). 



Ceraphron Jurine. 



Key to Species. 



I. Head, thorax, and abdomen black 3 



