ERIOPTERA. 15T 



whereas the other veins are yellowish-brown ; costa and first 

 longitudinal veins yellowish. 



Hab. Washington, D. C, and farther north; not rare. 



4. E. vespertina 0. S. % and 9- — Oehracea, thorace superne 

 saturate rufo-fusco ; humeris sulphureo-flavis ; alis immaculatis ; venis 

 pallidis ; halteribus flavis. 



Ochraceous, thorax of a saturate reddish-brown above ; humeri sulphur 

 yellow ; wings immaculate ; veins pale ; halteres yellow. Long. corp. 

 0.22—0.25. 



Syn. Erioptera vespertina 0. Sackbn, Proc. Ac. Nat. Sc. Phil. 1859, p. 226. 



Ochraceous, with a slight brownish tinge ; front sulphur yellow, 

 brown in the middle ; rostrum yellowish, palpi brownish ; antennas 

 brownish ; two basal joints somewhat pale, but infuscated at the 

 tip ; basis of the flagellum likewise pale. Thorax reddish-brown 

 above ; the usual four stripes hardly indicated by faint, yellow, 

 dividing lines ; pleurae yellowish, very slightly hoary ; humeri 

 sulphur yellow ; halteres yellow ; feet slender, brownish-yellow ; 

 abdomen brownish-ochraceous ; horny appendages of the male 

 forceps (Tab. IV, fig. 20) brown at the tip. Wings with a slight 

 grayish tinge ; veins pale. 



Hab. Washington, D. C. ; Florida ; Wisconsin (Kennicott) ; 

 not rare. 



5. E. chlorophylla 0. S. % and 9 .— Pallide viridis tota. 

 Altogether pale green. Long. corp. 0.2 — 0.25. 



Syn. Erioptera chlorophylla 0. Sacken, Proc. Ac. Nat. Sc. Phil. 1859, p. 226. 



Body pale green ; antennae, halteres, veins, genitals, etc. like- 

 wise ; the eyes alone being black. The ovipositor of the. female 

 is rather long ; the upper valves but little curved (wing, Tab. I, 

 fig. 16). 



Hab. Middle States ; not rare. 



6. E. straminea, n. sp. % and 9 . — Pallide flava tota. 

 Altogether pale yellow. Long. corp. 0.2 — 0.23. 



The whole body, including the wing-veins, is uniformly pale 

 yellow ; the last tarsal joint slightly infuscated. 



For a long time I took this species for a mere variety of E. 

 chlorophylla ; but the upper valves of its ovipositor are shorter 

 and much more arcuated. 



