G4 DIPTERA OF NORTH AMERICA. [PART IV. 



Hab. Washington ; in June. 



I found fourteen specimens of this species upon one occasion 

 in Washington. If it was not for the difference in the structure 

 of the male forceps, I would have taken this species for a darker 

 variety of D. immodesta. The venation of both is exactly the 

 same. 



4. I>. diversa 0. S. % and 9 • — Ochracea, antennis fuscis, basi 

 pallidis ; alis hyalinis, stigmate pallido ; areola discoidali clausa ; venula 

 subcostalis transversa ab auxiliaris apice stigmatis longitudine remota ; 

 venas auxiliaris apex initio praefurcse plus minusve oppositus. 



Ochraceous, antennae brown, pale at the base ; wings hyaline, stigma pale ; 

 discal cell closed ; subcostal cross-vein removed from the tip of the 

 auxiliary vein at a distance equal to the length of the stigma ; the tip 

 of the auxiliary vein is more or less opposite the origin of the praefurca. 

 Long. corp. 0.2 — 0.25. 



Stn. Dicranomyia diversa 0. Sacken, Proc. Ac. Nat. Sc. Phila. 1859, p. 212. 



The body is ochraceous ; the head above, the halteres and the 

 abdomen are mfuscated ; genitals ochraceous. Antenna? more 

 or less infuscated, basal joints pale. The tip of the auxiliary 

 vein is more or less opposite the origin of the praefurca ; the sub- 

 costal cross-vein is at a considerable distance from the tip of the 

 auxiliary vein, this distance being at least equal to the length of 

 the stigma ; the discal cell is closed ; the stigma has a slight 

 brownish tinge. 



Hab. Washington, D. C. ; Maryland ; in the spring. 



This species is much smaller than D. immodesta, and more- 

 over is easily distinguished from it by its closed discal cell ; the 

 verticils of its antennae are much shorter. 



I possess three specimens collected by Mr. R. Kennicott, near 

 Fort Resolution, H. B. T. ; they are very like B. diversa, but 

 have the thorax darker, the feet more brown above, and the 

 halteres paler. They may belong to a different species. 



5. D. piidica 0. S. % and 9. — Pallide ochracea tota ; oculis nigris, 

 tarsorum apicibus fuscis ; alis pallide flavescentibus ; venis pallidis ; 

 venre auxiliaris apex initio prsefurcae parum anterior ; venula sub- 

 costalis transversa ab auxiliaris apice parum remota. 



Altogether pale ochraceous ; eyes black ; tip of the tarsi fuscous ; wings 

 with a pale yellowish tinge ; veins pale ; the tip of the auxiliary vein 



