long's second expedition. 251 



BERIS Latr. 



B. VIRIDIS. — Bright green ; tergum black-brown ; venter pale ; 

 ieet yellowish. 



Inhabits Pennsylvania. 



Head brassy-green polished ; antennae obscure yellowish, 

 brownish at tip ; proboscis and pulpi whitish; stethidium green, 

 polished ; scutel with four yellowish spines ; wings hyaline ; stig- 

 mata large, fuscous ; nervurcs fuscous, those of the costal margin 

 anterior to the stigmata whitish ; central areola destitute of an 

 abbreviated nervure, two nervures passing off from the tip, and a 

 third from very near its base ; poisers white; feet pale yellowish, 

 tarsi dusky at [369] tip, posterior tibiae fuscous at tip ; tergum 

 black-brown, incisures and lateral edge yellowish; venter pale yel- 

 lowish, dusky at base. 



Length to the tip of the wings one-fourth of an inch. 



This species seems to be allied to the tibialis of Europe, but 

 the posterior tibia are not very obviously clavated, the central 

 cellule of the wings is destitute of the small abbreviated nervure, 

 and the inferior of the three nervures which radiate from this 

 cellule issues out very nearly from its base, and not from the 

 inferior middle as in that species. 



ODONTOMYIA Meig. Latr. 



0. VERTEBRATA. — Black ; abdomen white, with dorsal black 

 spots. 



Inhabits North-west Territory. 



Mouth deep black, pale within; hypostoma with an elevated 

 testaceous knob ; antennae deep black, terminal joint beneath 

 dusky testaceous ; thorax blackish, with hardly perceptible hairs ; 

 scutel dull testaceous, black at base; tip a little hairy; spines 

 horizontal, white ; wings white ; poisers white, with a whitish- 

 glaucous capitulum : feet yellowish-white ; abdomen subquadrate, 

 much depressed, white ; tergum with a series of large black spots 

 almost connected together. 



Length -^ rather more than three-tenths of an inch. 



COENOMYIA Latr. Meig. 

 C. PALLIDA. [Ante p. 42.] 



