76 ACADEMY OF NATURAL SCIENCES 



dusky on the tarsi ; poiscrs white; tergum rather darker than the 

 thorax. 



Length less than three-twentieths of an inch. 



The central nervure of the wing is nearly rectilinear, being 

 hardly perceptibly reflected. 



5. D. FEMORATUS. — Green ; tibia and tarsi whitish. 

 Inhabits Pennsylvania. 



Body brilliant green, with bluish reflexions ; front pruinose ; 

 antennae blackish; proboscis yellowish; wings hyaline; scutel 

 blue ; thighs green, and excepting the posterior ones, whitish at 

 tip, tibia white, tarsi dusky; tergum, ultimate joints cupreous at 

 their bases. 



Length three-twentieths of an inch. 



The brilHancy and shade of green in this insect are similar to 

 D. sipho ; when living, and in the sun's rays, it resembles bur- 

 nished gold, nervures nearly as in siplio. 



[Belongs to Psilopus. — Sacken.] 



6. D. CUPREUS. — Green, varied with cupreous ; feet whitish, 

 tipped with dusky. 



Inhabits Maryland. 



Front pale, with minute silvery hairs ; vertex purple-blue ; 

 antenna} pale, yellowish, black on the upper edge and at tip; 

 palpi and proboscis pale-yellowish ; thorax cupreous ; scutel 

 greenish-brassy ; feet whitish, dusky at tip ; tergum green, varied 

 with cupreous, posterior margins of the segments cupreous. 



Length one-fourth of an inch. [87] 



This species is more robust than the preceding ones. I ob- 

 tained several specimens on the eastern shores of INIaryland and 

 Virginia. Central nervure abbreviated, but angularly connected 

 near its tip to its jjarallcl branch, by a short nervure, which in- 

 clines a little towards the base of the wing. 



[Name changed by Wiedemann to D. cuprinus, as there was 

 previously a European D. cupreus Fall. — Sacken.] 



7. D. rATiBULATLs. — Green; wings bifasciate; feet black. 



Inhabits E. Florida. 



Body green, brilliant ; hypostoma pruinose ; antennae and palpi 

 black; proboscis piceous-black ; wings with two brown or fuligi- 

 ginous bands beyond the middle, perpendicular to the costal 

 edge, not attaining to the inner margin, and connected on the 



[Vol. III. 



