NATURAL SCIENCES OP PHILADELPHIA. 227 



with two blackish rings ; length 1 \~2\ lines. Common in the United 

 States; occurs also in Cuba. Say, Journ. Acad. Philada. iii. 17. 



E. callptera Say. 

 Wings hyaline, slightly cinereous ; about ten brown spots along the margins of 

 the wing, at the tips of the longitudinal veins; the spots along the anterior 

 margin are larger; cross-veins infuscated ; thorax yellow, with two brown 

 stripes ; similar stripes on the pleura ; feet pale, with a brown ring before 

 the tip of the femora; abdomen brown ; length 1-1 J lines. Washington, 

 D. C, Savannah, Ga. Ten ^ 9 specimens (nob.) E. parva. 



11. Surface of the wing naked, the veins alone being hairy. 12 

 Whole surface of the wing hairy ; body cinereous; a brown stripe over the 

 thorax; antennae fuscous, paler at the base of flagellutu; verticils short ; 

 palpi black; halteres pale, slightly infuscated at the base of the knob 

 the tip of which is clothed with a short, golden yellow pubescence; feet % 

 dark tawny, paler at base of femora, brown at tip of tarsi; brown ring 

 before the tip of femora; knees whitish ; wings greyish-white, with grey 

 nebulosities; they form two more or less marked bands across the apical 

 areolets ; a third band passes over the cross-veins ; there is one nebula in 

 the centre of the praebrachial area; another in the axillary, and some neb- 

 ulosities in the subaxillary area; length 2 \~ 2f lin. Washington, D. C, 

 common in April ; on the 15th of this month I caught several pairs in 

 copula. ' E. nubila. 



12. Wings with numerous brown spots. 13 

 Wings pale yellowish with two brown bands ; the first begins at the origin 



of the petiole, is broadest in the middle, and reaches the posterior margin 

 at the tip of the axillary veins ; the other is parallel, runs from the anterior 

 to the posterior margin, and includes at each end a small transparent spot ; 

 sometimes the spot at the anterior margin is connected with the yellow of 

 the apical part of the wing; in this case a brown spot at the tip of the 

 subcostal vein is isolated from the band ; second lower discal cross-vein 

 slightly colored ; small brown dots at the tips of the upper branch of the 

 radial fork and of both branches of the lower fork; body brown; thorax 

 yellow; pleura brown; feet and halteres pale; femora with brown rings; 

 length, lin. 2}-2. Trenton Falls, N. Y., and Virginia Springs (nob.); 

 Connecticut (Mr. Norton) ; 12 $ 9 specimens. E. venuata. 



13. Feet pale; thorax cinereons, without stripes; abdomen fuscous; posterior 

 margins of segments pale; five or six brown spots at the anterior margin 

 of the wing; the second spot from the base does not touch this margin; 

 tips of all the veins along the posterior margin clouded with brown ; theie 

 is a nebulosity in the subaxillary area; cross-veins clouded; great cross- 

 vein nearer to the base of the wing than the other central cross-veins; the 

 second externomedial vein is prolonged in the shape of a stump, inside of the 

 discal areolet ; sometimes this stump reaches the opposite side of the areolet, 

 and thus divides it in two ; length, lin. 21-2J. Washington in the Spring 

 (nob.); Wisconsin (Mr. Ulke) ; 16 tf and 9 specimens. E. armata. 



Feet varigated with brown, which forms two broad rings on the anterior 

 femora, occupying the whole surface; posterior femora brown, with a pale 

 ring before the tip ; tips of tibiae and tarsi brown; thorax yellowish cine- 

 reous, a brown, capillary often indistinct stripe on the praescutum ; a 

 broad, dark brawn stripe reaches from the humeri to the metathorax, 

 passing inside of the base of the wing; a similar stripe on the pleurae; 

 abdomen brown; halteres pale; antennae brown, with pale base; (those 

 of the $ densely clothed with a short pubescence); palpi brown ; tips of 

 the longitudinal veins, cross-veins, etc., clouded ; costal vein infuscated at 

 six intervals, especially opposite the petiole, where a spot occurs, one 

 branch of which nearly reaches the praebrachial vein; pobracbial vein 

 infuscated and clouded twice before the great cross-vein, which is arcuated 

 and nearer to the base of the wing than the other central nervures; some 



1859.] 



