APPENDIX. 377 



dually attenuated to the base, and with pale yellowish- 

 brown hair. 



Length about three-tenths of an inch. 



This species is very closely allied to the S. auraius, 

 Meig. Fabr. but it is smaller and the feet are dissimilar; it 

 may, however, prove to be a variety of that species. 



2. S. dorsalis Black, eyes brassy, with a green line ; 

 feet white, tibiae and tarsi above blackish. 



Inhabits Kentucky. 



SteniTnata approximate on the vertex; eyes brown, 

 when recent brassy-green tinged with red or purplish, a 

 broad, green, longitudinal line across the middle; antennse 

 whitish at base;yee/ white; tarsi black at the tip; anterior 

 and posterior tibise black above ; loings dusky, nervures 

 deep brown, carpus distinctly marked by an oblong, opake, 

 brown spot; abdomen oval, middle of the two or three ba- 

 sal segments of the tergum and venter whitish. 



Length of 9 one-fifth of an inch, ^ rather less. 



The male is very similar to the female, but is a little 

 smaller. This species is allied to the genus Vappo, Latr. 

 by the nervures of the wings, the nervure between the 

 three which radiate from the central joint being altogether 

 wanting, but the second joint of the antennae resembles 

 that of a Sargus, the third joint is deficient in my speci- 

 mens. In general form it resembles S. politvs, Linn. 



PARAGUS, Latr. 



P. 4-/asciatus. Black; tergum with four yellow bands ; 

 costal margin of the wings fuscous. 



Inhabits North-west Territory. 



Hec^ pale yellowish; hypostoma slightly impressed 

 with a black line, and another dilated black line descends 



