No. 22.] HYMENOPTERA OF CONNECTICUT. 259 



Praon Haliday. 

 Key to Species. 



1. Length 3 mm.; bright yellowish red, smooth and polished 



humulaphidis 

 Length 2 mm.; at least head and thorax mostly blackish; 

 abdomen mostly blackish 2 



2. Clypeus, mandibles and legs brownish stramineous; wings 



hyaline, faintly smoky, with blackish veins alaskensis 



Blackish, except part of abdomen, thorax beneath, and face, 

 which are brownish, and first, second, and third antennal 

 joints, which are yellowish testaceous; otherwise as in 

 preceding species pequodorum 



P. humulaphidis Ashmead. 

 Parasitic on the hop plant aphis. 

 P. alaskensis Ashmead. 



West Haven, 27 June, 1905, taken in sweeping through a culti- 

 vated field (H. L. V.). 



*P. pequodorum Viereck (new species). 

 Type locality: New Haven, 4 July, 1905 (H. L. V.). Bred 

 from aphids on black birch, 1 July, 1913 (L. B. Ripley). 



Aphidius Nees. 

 Key to Species. 



1. Fore wings without a recurrent vein 2 



Fore wings with one recurrent vein represented in a disco- 

 cubital vein, wings without brown bands; mesopleurae with- 

 out a furrow; mesonotum not distinctly punctate; median 

 longitudinal carina of propodeum dividing near middle to 

 form a petiolarea; stigma not attenuated, hardly five times 



as long on margin of wing as wide between the latter mar- 

 gin and origin of radius; joints of flagel at least twice as 

 long as thick 7 



2. Fore wings without either part of the cubitus or transverse 



cubitus 3 



Fore wings with a transverse cubitus and part of cubitus; 

 propodeum without carinas; thorax polished, black; mid 

 and hind legs usually blackish; female antennae usually 

 13-jointed, sometimes 11- or 12-jointed; male antennae 14- 

 or 15-jointed .testaceipes 



3. Hypopygium in female developed into a process with two 



prongs 4 



