GONIOMYIA. 181 



strongly converging towards the anterior branch of the fourth 

 vein ; cliscal cell closed in the majority of the specimens. 



Common, in summer; Washington, D. C. ; Trenton Falls, N. Y., 

 etc. Among fifteen specimens which I had before me, when I 

 first described this species, only one had the discal cell open. 



2. G. cognatella 0. S. % and 9 .— Sulphureo-fiava, fusco variegata, 

 antennis basi aurantiacis, in mare dense pubesoentibus, verticillis brevi- 

 bus ; pedibus nnicoloribus ; cellula discoidali aperta. 



Sulphur yellow, variegated with brown ; antennae orange yellow at the 

 basis, densely pubescent and with short verticils in the male ; feet uni- 

 colorous ; discal cell open. Long. corp. 0.2 — 0.25. 



Syn. Gonomyia corjnatella 0. Sacked, Proc. Ao. Nat. Sc. Phil. 1859, p 230. 



Very like the preceding, but easily distinguished by the follow- 

 ing characters : The antenna? of the male are covered on every 

 joint with a short, dense pubescence, which, being interrupted at 

 the articulations, makes the antenna? appear moniliform ; the 

 halteres (b®th stem and knob) are infuscated ; the pleura? are 

 yellow, with a brown stripe ; the feet are uniformly pale tawny, 

 only the tips of the tarsi darker ; the discal cell is open (at least 

 in the normal specimens) ; the inner angle of the marginal cell is 

 more acute, the prsefurca running obliquely from the first longi- 

 tudinal vein ; the anterior branch of the second longitudinal vein 

 is more oblique, and therefore somewhat longer; the distance 

 between the tips of both branches of this vein is about twice the 

 length of the distance between the tip of the anterior branch and 

 that of the first longitudinal vein ; the third vein is straight, 

 although, in its whole course, somewhat converging towards the 

 anterior branch of the fourth ; the second submarginal cell is 

 somewhat longer than the first posterior. The forceps of the male 

 (Tab. IV, fig. 18) has a somewhat different structure from that of 

 G. sulphur ella. 



Eab. Washington, D. C. I had seven specimens. 



3. G. siibcinerea 0. S. % and 9. — Sulphureo-fiava : mesonoto 

 cinereo-fusco ; antennis nigris ; pedibus unicoloribus; cellula discoidali 

 (in speciminibus typicis) clausa. 



Sulphur yellow ; mesonotum grayish-brown ; antennre black ; feet uni- 

 colorous ; discal cell (in the normal specimen) closed. 



Syn. Gonomyia subcinerea 0. Sacken, Proc. Ac. Nat. Sc. Phil. 1859, p. 231. 



