OF PHILADELPHIA. 77 



costal margin by a dilated line of the same color ; feet black ; 



thio-hs and coxas blackish-blue. 



o 



Length rather more than three-twentieths of an inch. % . 



This species closely resembles D. sipho, but it is much smaller, 

 the bands of the wings without any obliquity, and the feet en- 

 tirely colored. 



[Belongs to Psilopus. — Sacken.] 



S ARGUS Latr. Melg. 



S. viRiDis. — Body green, polished ; wings dusky ; eyes above 

 brassy. 



Inhabits the United States. 



Body green, polished, vai-ied with brassy, and in a certain 

 light purplish, and covered by very short hair ; eyes very large, 

 brown, when recent deep green, polished beneath, above tinged 

 with brassy, sub-opaque, [88] and separated from the green of 

 the inferior portion, by a red line ; antennae black ; labia pale ; 

 tibia blackish. 



Length seven-twentieths of au inch. 



Var. a. Bluish-purple. 



Var. b. Bluish-purple ; abdomen green. 



A very pretty species ; I found it near Cincinnati, perched 

 upon a leaf j it is also an inhabitant of the Atlantic States. It 

 has a bright-green appearance, although covered with very short 

 hairs, but these are hardly discernible to the unassisted eye. It is 

 closely allied to S. xantho^iterus Fab., but the joints of its feet 

 are not yellowish, as those of that species are. 



SC^EVA Fabr. Latr.* 



1. S. POLITA. — Thorax with a yellow line each side, and a 

 cinereous dorsal one; tergum with band and quadrate spots 

 yellow. 



Inhabits the United States. 



Head yellow, above the antennae dusky silvery; thorax some- 

 what olivaceous, a yellow line above the wings, and a dorsal 

 cinereous one : scutel dusky yellowish, with a paler margin; feet 

 whitish ; tergum black, basal segment with a basal lateral edge; 

 182.3.] 



*The name now adopted for this genus is Syrphus Linn. — Sacked, 



