LONG S SECOND EXPEDITION. 219 



middle; near the neck black ; thorax transversely wrinkled, and 

 with three longitudinal impressed distant lines, of which the in- 

 termediate one is black, and the lateral ones black on the exte- 

 rior side ; scutel scabrous, abruptly elevated at tip, and emar- 

 ginated; [326] metathorax scabrous, black on the disk ; wings 

 fuliginous-black ; pleura and pectus blackish, the former with an 

 obsolete, longitudinal line beneath the wings; thighs piceous in 

 the middle; posterior pair black in the middle; abdomen com- 

 pressed almost to flatness, piceous-black, margins of the segments 

 paler ; elongate-oval ; rounded, but sharp-edged at tip ; tergum 

 and venter also with sharp edges. 



Length nearly seven-tenths of an inch. 



This species is not of very common occurence. It is very 

 "dosely allied to Banclms cultellator Fabr. 



CHALCIS Fabr. Latr. 



1. C. MICROGASTER. — Slender, black ; anterior pairs of feet 

 and posterior tarsi, yellowish; peduncle as long as the abdo- 

 men. 



Inhabits Pennsylvania. 



Stethidium with dilated, dense punctures ; metathorax with 

 an angulated line above the insertion of the abdomen ; wings 

 hyaline, costal nervure fuscous ; posterior feet black ; tarsi yel- 

 lowish ; first joint of the coxae with a small acute tooth above 

 near the tip; thighs as large as the abdomen, with numerous, 

 small, regular teeth on the posterior edge ; tibiae, terminal spine 

 longer than the first joint of the tarsi; abdomen polished, a little 

 compressed, triangular, the superior angle rounded. 



Length less than one-fifth of an inch. 



2. C. OVATA. — Robust, black; feet yellow, thighs black at 

 base, head with a golden reflection. 



Inhabits Ohio and Pennsylvania. 



Head black, with golden sericeous hair, which is indistinct on 

 the vertex; antennae testaceous beneath towards the tip; stethi- 

 dium with dilated, dense punctures, a little [327] sericeous with 

 golden hair ; scale covering the base of the wings yellow ; wings 

 hyaline; nervures fuscous, at base pale yellowish ; feet bright yel- 

 low ; basal half of the anterior pairs of thighs black ; posterior 

 thighs smaller than the abdomen, black, with a yellow spot on 



