226 PROCEEDINGS OP THE ACADEMY OF 



4. Surface of the wing naked, the veins alone being hairy, 5 

 The whole surface of the wing hairy ; its color is pale brown ; lower fork 



shorter than the upper one; the upper branch of lower fork forms a curve 

 near its origin; the lower branch is straight; body dark cinereous ; stripes 

 on thorax obsolete ; halteres and base of femora pale ; ovipositor ferru- 

 ginous. Length 2J lin. Washington, two 9 spec, (nob.) E. holotricha. 



5. Body pale green ; antennae, halteres, veins, genital organs, etc., also pale 



greenish ; eyes black. Long. lin. 22\. Common $ 9 Washington, 



Dalton, Ga. (nob.) E. chlorophylla. 



Body yellow or brown, 6 



6. Knob of halteres brown ; body ochraceous ; front whitish, infuscated in the 



middle; praescutum with more or less distinct, confluent brown stripes, the 

 intermediate one is dark brown on the collare, and the anterior part of the 

 pra?scutum ; tergum infuscated, antennae, except the base, and palpi brown ; 

 wings hyaline, slightly cinereous, immaculate, veins dusky ; hairs much 

 shorter than in the other species of the genus ; feet pale yellow ; length 2 2 

 lin. Sharon Springs, N. Y. (nob.) Maine, (Mr. Packard.) Six J 1 and $ 

 specimens. E. septemtrionis. 



Knob of halteres pale, 7 



T. Body brown ; a sulphureous spot on the shoulder extended into a pale stripe 

 towards the basis of the wing; base of femora pale; tip of halteres with a 

 fine, silky, golden yellow pubescence ; horny appendages of the tf forceps 

 pale, with brown tips; wings dusky; hairs long; long. lin. 2. Middle 

 States (nob.) Single (J 1 specimen. E. villosa. 



Body yellow, 8 



8. Wings immaculate, slightly yellowish cinereous ; veins pale, hairs of moder- 



ate length ; palpi and antennse brown ; the first 3 or 4 joints of the fla- 

 gellum pale; (the two basal joints of the antenna are generally infuscated, 

 especially the tip of the second;) thorax of a saturate reddish yellow on 

 the back, paler, almost sulphureous on the shoulders; pleura pale, slightly 

 hoary ; tips of the tarsi and of the horny parts of the ^ forceps brown ; 

 lin. 21 2 long, common ; Washington D. C. Florida, (nob.) Wisconsin, 

 (Mr. Kennicott.) E. vespertina. 



Wings yellowish, with two brown dots on the anterior margin ; (one across 

 the stigmatical cross-vein ; the other at the tip of the subcostal vein ;) 

 veins pale yellow, infuscated at all their tips and anastomoses, cross-veins 

 infuscated; great cross-vein nearer to the base of the wing, than the other 

 central cross-vein ; a fringe of golden yellow hairs at the tip of the wing, feet brown, 

 clothed with brown hairs ; base of femora yellow, which color extends 

 nearly to the tip of the posterior femora; antennse of the tf clothed with a 

 dense pubescence, besides the verticils ; length lin. 2 21. Washington, 

 D. C. three % spec, (nob.) E. chrysocoma. 



9. Surface of the wing naked, the veins alone being hairy. 10 

 Whole surface of the wing pubescent; a brown spot in the region of the, stigma ; 



indistinct nebulosities on the central cross-veins; upper branch of the 

 lower fork straight ; lower branch arcuated, almost angular near its origin ; 

 great cross-veins a little nearer to the base of the wing than the other 

 central cross-veins; body cinereous ; antennas brown ; those of the <^ densely 

 pubescent besides the verticils ; stem of the halteres dusky ; the latter part 

 of the knob pale yellow ; feet blackish tawny, pale at base, knees pale, 

 length lin: 2-2. Middle States, eight specimens <J 9, (nob.) 



E. Meigenli. 



10. Wings fuscous, with numerous round, white spots on the surface, and six 



large square spots of the same color along the anterior margin ; thorax with 

 two fuscous lines above and one on each side, before the wings; femora 



[Aug 



