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



Chorineus Holmgren. 

 Key to Species. 



1. Metapleurse entirely smooth, or with two or three short 



carinse converging to the junction with hind coxae 2 



Metapleuras longitudinally pitted; mesopleurae longitudinally 

 or diagonally pitted above mid coxae; three distinct carinae 

 on third dorsal abdominal segment; upper part of meta- 

 pleurae smooth and polished, hind femora reddish. Length 

 4-6 mm. (female and male) costatus 



2. Second dorsal abdominal segment scabrous, with one or more 



carinae, no constriction between this segment and third; 

 face yellow. Length 6-7 mm. (female and male) . . . .carinatus 

 Second dorsal abdominal segment with a median and two 

 distinct lateral carinae; propodeum with six or seven carinae; 

 basal dorsal abdominal segment with five carinae; face 

 yellow or reddish yellow. Length 6-7 mm (female and 

 male cariniger 



*C. costatus Davis. 



C. cariniger Walsh. 

 *C. carinatus Cresson. 



Alcocerus Foerster. 



°A. trifasciatus Cresson. 



Female and male : length 9-10 mm. ; mostly black, with yellow 

 markings as follows: antennae, palpi, tegulae, scutel, apical third 

 of first, second and third dorsal abdominal segments, genitalia, 

 more or less of coxae and femora, trochanters, tarsi, and tibiae ex- 

 cept tips of hind pair ; wings dusky hyaline. 



Periope Curtis. 



P. aethiops Cresson. 



Male : length 7 mm. ; mostly black, with the tegulae, a stripe 

 beneath the latter, fore legs beyond the middle of their femora, 

 basal half of mid and hind tibiae, apex of mid femora, and most 

 of venter, yellow ; tarsi of mid and hind legs yellowish brown ; 

 areolet present, triangular. 



Pseudometopius Davis. 



°P. hageni Cresson. 

 Female and male: length 14 mm. Female: mostly black, with 

 yellowish white markings as follows: short line along ih.i margin 



