NO. 1938. THE DIPTEROUS FAMILY PHORID^—MALLOCH. 493 



APHIOCH.ffiTA DYARI, new species. 



Male. — Black, hardly shining; frons about one-fourth broader than 

 long, frontal bristles long, except the post-antennal pair, which are 

 strong, and only about one-third aS long as the others, frons convex 

 anteriorly, the bristles of first row very near the anterior margin, 

 the outer pair being almost as close to margin as the center pair, 

 which are much closer to the post-antennals than to the outer pair, 

 antennae rather large, nearly half as large as the eye, and round, 

 arista short and thick, about as long as breadth of frons, indistinctly 

 pubescent; palpi pale yellow, normal; thorax hardly shining, pleurae 

 glossy on the lower half; abdomen dull black, segments subequal, 

 only the sixth segment with distinct pre-apical bristles, hypopygium 

 rather large, brown, anal protuberance of average size, yellow, 

 with scattered hairs and two terminal long bristles ; legs dusky yellow, 

 hind femora strong, brown, with rather long soft hairs on basal half 

 of ventral surface, hind tibial dorsal ridge distinct, setulse on apical 

 half (4-5) rather widely placed and distinct; costa to near middle, 

 first division more than twice as long as second, third barely one-half 

 as long as second, fringe longer than fork of third vein but delicate, 

 fourth vein distinctly bent at base and ending with a slight upward 

 bend at distinctly in front of wing tip ; halteres yellow. 



Length, 2| mm. 



Type.— Cat. No. 14891, U.S.N.M. 



One male, Kaslo, British Columbia (H. G. Dyar). 



A very distinct species, resembling in most respects the group 

 with four bristles on the scutellum. 



APHIOCH^TA FLAVINERVIS, new species. 



Female. — Brownish black, slightly shining; frons brown, gray 

 dusted, bristles arranged much as in dyari but the post-antennal 

 pair are much larger and wider apart, occupying about one-fourth the 

 width of frons as against one-sixth in dyari, the antennae are brownish 

 and of rather small size, the arista is little longer than breadth of 

 frons but more distinctly pubescent than in dyari, the palpi are yellow 

 and normal; thorax brownish, slightly shining, humeri yellow; 

 abdomen brown, apices of segments narrowly paler, segments sub- 

 equal, no noticeable bristles present ; legs yellow, tips of hind femora 

 and tips of posterior surfaces of hind tibiae dark brown, mid tibiae 

 with short setulae, hind tibiae and femora strong, the former with 

 distinct dorsal ridge and distinct setulae which are longest on middle ; 

 costa to about two-fifths of wing length, thick veins flavous, first 

 costal division three times as long as second, third division half as 

 long as second, fringe about as long as fork of third vein and very 

 delicate, fourth vein nearly straight at base and ending much in 

 front of wing tip, thin veins very fine but distinct; halteres yellow. 



