LONG S SECOND EXPEDITION. 257 



SARGUS Latr. Meig. 



1. S. decorus. — Front blue; thorax green ; tergum greenish 

 golden ; feet pale yellow. 



Inhabits Pennsylvania and East Florida. 



Hypostoma and vertex blackish ; proboscis yellow ; antenna- 

 dusky yellowish ; third joint darker; frontal tubercles with a 

 white reflexion ; wing dusky, stigma distinct; poisers pale yel- 

 low; pleura blackish-piceous ; feet yellow; posterior tarsi dusky ; 

 abdomen slender, widest at tip, gradually [377] 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. aura/us 

 Fabr., but it is smaller, and the feet are dissimilar ; it may, how- 

 ever, 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. 



Stemmata approximate on the vertex ; eyes brown, when re- 

 cent brassy-green tinged with red or purplish, a broad, green, 

 longitudinal line across the middle; antenna; whitish at base; 

 feet white ; tarsi black at the tip ; anterior and posterior tibiae 

 black above ; wings dusky nervures deep brown, carpus distinctly 

 marked by an oblong, opake, brown spot ; abdomen oval, mid- 

 dle of the two or three basal 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 ner- 

 vures 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 specimen. In general form it resemble S. po- 

 litics Linn. 



[Is a Beris according to Wiedemann. — Sacken.] 



PARAGUS Latr. 



P. 4-fasctatus. — Black; tergum with four yellow bands; 

 costal margin of the wings fuscous. 



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