OP PHILADELPHIA. 75 



I obtained an Individual at Engineer Cantonment^ less tlian 

 half the above mentioned size. 



DOLICHOPUS Fab. 



D. SIPHO. — Green ; wings bifasciate ; feet whitish. 



Inhabits the United States. 



Body green brilliant ; hypostoma pruinose ; front blue ; an- 

 tennae and palpi black ; proboscis yellowish ; thorax tinged with 

 blue ; scutel blue ; wings with two brown or fuliginous, somewhat 

 oblique bands beyond the middle, which do not attain the thinner 

 margin, and are connected on the costal margin by a dilated line 

 of the same color, forming a siphon-like mark ; pectus on each 

 side with a somewhat silvery reflection ; feet whitish ; tarsi dusky. 



Length one-fourth of an inch. 



Not uncommon ; the terminal segments of the tergum of the 

 male are tinged with golden, but the ultimate segments in each 

 sex is blue. Central nervure furcate, the exterior branch widely 

 angulated and terminating near the tip of the preceding ner- 

 vure. 



[Belongs to Pstlojms Meig. — Sacken.] 



2. D. UNIPASCIATUS. — Bluish-green ; a white band at the base 

 of the abdomen. 



Inhabits Pennsylvania. 



Body- bluish-green, polished, slender : antennae, palpi and pro- 

 boscis whitish ; scutel blue ; wings immaculate ; feet whitish ; 

 tergum, first segment and half of the second whitish, posterior 

 half of the second segment and third segment much tinged with 

 blue, remaining segments green. 



Length one-fourth of an inch. 



Central nervure of the wing furcate, the exterior branch 

 widely angulated and terminating near the tip of the preceding 

 nervure, which is curved very considerably inwards, towards its 

 tip. 



[Also a Pdlopus ; the name is changed to P. Sayi by Wiede- 

 mann. — Sacken.] 



4. D. OBSCURUS. — Blackish-brassy ; wings dusky ; feet pale. 

 Inhabits Pennsylvania. [86] 



Head dark-silvery; antennae black-brown; mouth blackish; 



thorax and scutel dark-brassy ; wings dusky ; feet white, a little 



1823.] 



