72 ACADEMY OF NATURAL SCIENCES 



cepting the base and tip, also very pale rufous ; anterior tibia 

 spinous before, and beyond the middle and at tip. 



Length to the tip of the wings nearly one-quarter of an inch. 



Distinguishable from sjnnipes by its inferiority in size, and from 

 stigmaterus by its dark colored wings, &c. 



MYOPA Fab. Latr. 



1. M. VESICULOSA. — Head beneath vesicular and white; wings 

 whitish at base. 



Inhabits Pennsylvania. 



Body rather robust ; rostrum dark reddish-brown ; hypostoma 

 and cheeks vesicular, white, slightly tinged with yellow; front 

 and occiput yellowish-brown, the former with two dilated dark 

 lines ; antennae reddish-brown, third joint yellowish-white ; tho- 

 rax reddish-brown, obscure, varied with blackish, beneath the 

 scutel deep black; poisers pale yellow; [81] wings a little dusky, 

 slightly darker on the middle of the costal margin, base whitish ; 

 pleura and pectus reddish-brown ; feet dark reddish-brown, knees, 

 base of the tibia and tarsi, excepting the points of the articula- 

 tions, yellowish-white ; tergum blackish-brown, paler on the 

 margin ; S 9 • 



Length nearly three-tenths of an inch. 



2. M. LONGicoRNis. — Body black, hairy ; wings dusky, pale at 

 base : antennje as long as the head. 



Inhabits Missouri. 



Antennae pale on the inner side and beneath ; hypostoma pale 

 with a silvery reflexion ; front and vertex dusky ; proboscis 

 black ; thorax with two obsolete pale lines ; wings blackish, pale 

 towards the base ; poisers whitish ; anterior pairs of feet with 

 the thigh beneath, at base and leg, pale ; anterior pair of tro- 

 chanters pale, with a silvery reflexion ; posterior feet, thighs pale 

 on the basal moiety ; abdomen clavate and hamate at tip. 



Length about three-tenths of an inch. 



3. M. BiANNULATA. — Thorax dark-brown ; tergum pale tes- 

 taceous, annulate with dusky ; hind thighs biannulate with brown. 



Inhabits Pennsylvania. 



Hypostoma pure silvery ; front yellowish rufous ; vertex black- 

 ish-brown, obscure in the middle ; antennae white at base, third 



[Vol. III. 



