No. 22.] HYMENOPTERA OF CONNECTICUT. 481 



anterior ocellus than to each other; head distinctly broader than 

 thorax, densely and finely punctate, with a greenish metallic 

 luster, bulbs of antennae black, scape and pedicel honey-yellow, 

 flagel yellowish brown and often with a darker metallic tinge, 

 especially at the sutures; thorax mostly concolorous with the 

 head, and similarly punctate on the pro- and mesonotum ; all legs 

 honey-yellow except coxse, which are slightly metallic at base, 

 and tarsi and sometimes distal end* of tibiae, which are whitish ; 

 abdomen ovate, acuminate, glabrous, mostly black. 



Listed as an American parasite of the cosmopolitan Hessian 

 fly, from the final larva of which it has been bred in Missouri. 



Pachyneuron Walker. 



*P. nigrocyaneum (Norton). Chiropachys nigrocyaneus 

 Norton. 



Length 2.5 mm. Female: mostly dark blue-black, varying to 

 purple; head wider than thorax, antennae 13- jointed, the first and 

 second joints together nearly as long as the rest combined, yellow, 

 scape blackish, third joint not much shorter than fourth or fifth ; 

 prothorax transversely narrower than rest of thorax ; legs yellow, 

 except coxae, which are black; abdomen polished, flattened, oval- 

 triangular. 



Bred from the cocoons of Diprion abietis and D. simile. 



Type locality: Connecticut. New Haven, 1915 (W. E. B.). 



°P. apidivorum Ashmead. 



Female: length i mm. or a little longer; head metallic green, 

 sviffused with purple and purplish black on vertex, shagreened, 

 the sculpture coarser between the eyes; mandibles tridentate, 

 antennas brown, pubescent, scape and pedicel darker ; thorax pur- 

 plish black with bronzy and cupreous reflections, with a reticulate 

 sculpture, scapulae golden green, scutel convex, rounded, meta- 

 thorax wrinkled; wings hyaline, iridescent, pubescent except at 

 base, their veins pale yellow, the marginal vein brownish, stigmal 

 vein slightly longer than the marginal, with seven long hairs 

 along outer edge; legs pale yellowish, coxae black, anterior and 

 middle femora dusky near base above and beneath, at least for 

 two-thirds of their length ; abdomen flat, oval, blue-black, metallic 

 at base, and with bronze tingings toward apex, darker beneath. 



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