OF PHILADELPHIA. 79 



inferior part of the abdomen to the rails of a fence. This in- 

 cluded insect was evolved on the 22d of April. 



4. S. QUADRATA. — Thorax bluish-bronzed ; abdomen with 

 eight very large quadrate yellowish spots. 



Inhabits the United States. 



Head bluish-bronze, with short cinereous hair ; frontal eleva- 

 tion dusky ; antennae dark reddish-brown ; thorax and scutel 

 bluish-bronze, polished, immaculate ; feet testaceous ; anterior 

 tibia and tarsi of the male dilated, the joints of the latter much 

 shortened; first and last joints of the posterior tarsi blackish; 

 tergum with eight very large, quadrate, fulvous spots, occupy- 

 ing nearly all the surface, leaving only a dorsal line and inci- 

 sures black, the two spots of the penultimate segments are hardly 

 separated, sometimes united into a continuous band, and the ul- 

 timate or anal segment is immaculate, somewhat livid ; venter 

 yellow, whitish at base. 



Length one-third of an inch nearly. 



This insect is very nearly related both in form and colors to 

 >S^. mellina Fab., but the spots of the tergum occupy a far greater 

 portion of that part. [91] 



5. S. EMARGINATA. — Thorax dark green, with a yellow mar- 

 gin; tergum banded with yellow. 



Inhabits East Florida. 



Front yellow ; antennae on the superior margin fuscous ; a 

 double blackish spot above the base of the antennae; thorax 

 dark-green, a yellow line each side ; scutel yellow ; feet yellow, 

 posterior thighs and tibia dusky in the middle; tergum black; 

 first segment yellow on the exterior edge ; second segment with 

 a transversely oblong-oval spot on each side, attaining the exterior 

 edge; third segment with the edge of the basal angles, emargin- 

 ate band on the middle, not attaining the lateral edge, and posterior 

 edge yellow ; fourth segment with the edge of the lateral angles 

 (which joins the tip of the preceding segment to form a narrow 

 band,) band on the middle not attaining the lateral edges, and 

 most profoundly emarginate behind, and posterior edge yellow; 

 fifth segment with a triangular basal spot each side, and tip, 

 yellow. 



Length to the tip of the wings half an inch. 

 1823.] 



