C4 DIPTERA OF NORTH AMERICA. [PART IV. 



Ilab. 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. imniodesta. The venation of both is exactly the 

 same. 



4. D. 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 ; 

 venae auxiliaris apex initio prsefurcae plus miuusve oppositus. 



Ocliraceous, antennre 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 prsefurca. 

 Long. Corp. 0.2—0.25. 



Syn. Dlcranomyia diversa 0. Sacken, Proc. Ac. Nat. Sc. Phila. 1859, p. 212. 



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

 abdomen are iiifuscated ; genitals ochraceous. Antennse 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 antennas are much shorter. 



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

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

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

 halteres paler. They may belong to a different species. 



5. I>. pildica 0. S. % and 9- — Pallide ochracea tota ; oculis nigris, 

 tarsorum apicibus fuscis ; alis pallide flavescentibus ; venis pallidis ; 

 vense auxiliaris apex initio praefurcse parum anterior ; venula sub- 

 costalis transversa ab auxiliaris d^ice 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 



