LONGS 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 tt 

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

 and venter also with sharp edges. 



Length nearly seven-tenths of an inch. 



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

 closely allied to Banclius miltettator Fabr. 



CHALCLS Fabr. Latr. 



1. C. microgaster. — Slender, black ; anterior pairs oi 

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

 men. 



Inhabits Pennsylvania. 



Stethidium with dilated, dense ^y^ tures; 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 coxse 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 yello wis h ; feel bright yel- 

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

 thighs smaller than the abdomen, black, with a yellow - 



