480 PROCEEDINGS OF T'SE NATIONAL MUSEUM. vol.43. 



APHIOCH^TA DUBITATA, new species. 



Female. — Black, frons nearly half again as broad as long, gray 

 dusted, lower pair of post-antennal bristles about three-fourths as 

 large as upper pair, center pair of bristles in first row lower than 

 upper pair of post-antennals and much nearer center of frons than 

 outer pair in first row, antennae rather large, black, arista swollen at 

 base, distinctly pubescent, palpi dark brown, rather numerously 

 bristled, and of rather large size; thorax dull black, mesopleural bris- 

 tles distinct, abdomen brownish black, segments subequal, not notice- 

 ably bristled anywhere, ovipositor brown; legs brownish yellow, 

 apices of anterior coxae and trochanters yellow, fore legs paler than 

 posterior, posterior tibial setulae very indistinct; costa to near middle, 

 fij^t division more than twice as long as second^ third about one-half 

 as long as second, fringe very long and delicate, fourth vein distinctly 

 bent at base and ending near to wing tip ; halteres black. 



Length, 2 J mm. 



One female, Kokanee Mountains, British Columbia, 8,000 feet, 

 August 11, 1903 (R. P. Currie).^ 



This specimen has the fork of third vein absent in one wing. 



Type.— C&t. No. 14873, U.S.N.M. 



APHIOCH^TA DIVERGENS, new spedes. 

 Plate 37, fig. 5. 



Male and female. — Black; frons about one-fourth longer than 

 broad, distinctly shining, lower post-antennal bristles nearly as large 

 as upper pair, center pair of bristles in first row below the outer pair 

 and nearer center of frons, nearly in line transversely with post-anten- 

 nals, but nearer to the outer pair in first row than to the post-anten- 

 nals, antennae brownish-black, normal, arista distinctly longer than 

 frons, shortly pubescent, palpi yellow, normal; thorax shining, meso- 

 pleural bristles distinct; abdomen bare, segments subequal; legs 

 brown, anterior pair paler, fore tarsi shghtly thickened, hind tibias 

 with very minute setulae; costa to one- third the wing length, first 

 division twice as long as other two together, third but little shorter 

 than second, fringe short but strong, increasing gradually in size on 

 basal half and of a uniform size on apical half, fourth vein but slightly 

 bent at base and ending much in front of wing tip, fourth and fifth 

 gradually divergent from base to tip; halteres black or brown. 



Length, barely 1 mm. 



One male, one female, Plummers Island, Maryland, October 25, 

 1906 (A. K. Fisher) ; one male, Washington, District of Columbia, 

 September 30, 1912. 



Ti/jpe.— Cat. No. 14874, U.S.N.M. 



