OF PHILADELPHIA. 73 



joint yellowish-rufous, the extreme point dusky, style situate near 

 the tip, porrect, black; rostrum nearly as long as the body, black- 

 ish, at base white ; thorax margined with white ; pleura, pectus, 

 and anterior pairs of feet [ 82 ] white ; poisers fuscous ; posterior 

 thighs tinged with rufous on the middle, and with a brown an- 

 nulus each side of the middle, posterior tibia at tip, together 

 with their tarsi, fuscous ; tergum reddish-yellow, posterior mar- 

 gins of the segments brown ; venter narrow, white ; 9 oviduct 

 fuscous on its posterior half. 



Length nearly -j, three-tenths, 9 more than seven-twentieths 

 of an inch. 



The habitus of this insect is entirely different from others of 

 the genus. The body is slender, and not incurved, the rostrum 

 much elongated, and the oviduct of the female resembles an at- 

 tenuated continuation of the abdomen. 



[According to Wiedemann, who compared typical specimens; 

 this is M. stylata Fabr. — Sacken.] 



CONOPS Fabr. Latr. 



1. C. MARGINATA. — Black, slightly hairy; an interrupted line 

 upon the thorax before, and abdominal sutures yellow; costal 

 moiety of the wings fuscous. 



Inhabits Missouri. 



Body black, with fine hairs ; head yellowish-white ; vertex 

 black, a longitudinal line bifarious at the antennae, and trans- 

 verse above; hypostoma with an impressed black sagittate spot, 

 near the inferior tip of which, on each side, is a small black tri- 

 angular spot ; eyes chestnut ; proboscis black ; antennie black, 

 basal and terminal joints pale beneath ; vertex black, hardly ele- 

 vated above the eyes ; thorax, a yellow, anterior, transverse line 

 interrupted in the middle ; scutel ferruginous ; wings, costal 

 moiety black; halteres [83] whitish; feet pale reddish-brown: 

 abdomen clavate, incurved at tip, segments, excepting the ulti- 

 mate one, margined at tip with yellow ; central connecting ner- 

 vure of the wing minute. 



Length more than two-fifths of an inch. , 



2. C. SAGITTARIA. — Black, slightly hairy; humeral tubercle 

 ferruginous ; nearly two-thirds of the wing fuscous. 



Inhabits Pennsylvania. 

 1823.] 



