394 NEW EASTERN ANTHOMYIIDAE 



The anterior supra-alar ("pra" of Stein) very minute, differing 

 in this respect from Phaonia. Abdomen with four segments 

 subequal in length, the male with a deeply notched fifth sternite 

 as with the Coenosinae and the Hylemyiinae. Hind tibiae 

 each with but one seta on the median posterior extensor side 

 (calcar of Schnabl) beside the preapicals, but with three to six 

 stout, short setae on the outer flexor side at the middle third. 

 Wings not rilled, costal spine present; last section of Cui as long 

 or longer than the m-cu crossvein; squamae unequal. 



The color, the position of the lower sterno-pleural seta, the 

 position and number of the scutellar setae, the presence of two 

 anterior dorso-centrals, the shape of the abdomen, the absence 

 of the frontal cruciate setae in the female, and the elevated 

 position of the median posterior seta on the extensor surface of 

 the hind tibia offer a combination of characters which will 

 distinguish the members of this genus from the forms with which 

 they are most likely to be confused. 



Because of the rarity of the species of this genus and the pres- 

 ence of well marked characters, I venture here to erect a species 

 upon a single female specimen, a procedure not recommended in 

 general for members of this family. 



Dialyta flavi tibia n. sp. 



Female. Length 7 mm. Black, shining; the trochanters, knees, tibiae, 

 and halteres reddish-yellow, wings and squamae strongly yellow tinged. 



Head in profile, oval, viewed in front broader than high; front wider than 

 one eye, with parallel sides gradually widening a little on the lower third, in 

 profile produced at the base of the antennae about a third the width of the 

 eye; genae but slightly produced; buccae broader than the width of the third 

 antennal joint; face black, with a silvery sheen, somewhat receding, oral 

 margin not prominent; orbits subshining black, about one-fourth the width 

 of the dull black frontal stripe; ocellar triangle and the occiput subshining 

 black. Orbital setae in one row descend to the base of the antennae; cruciate 

 setae wanting; antennae nearly as long as the face; arista black, short plumose 

 to the tip, the longer hairs over twice as long as the diameter of the arista at 

 the base; palpi black, ahuost linear; proboscis normal, black, labellae red- 

 dish; eyes very sparsely pubescent below. Thorax black, shining, when 

 viewed obliquely very thinly whitish pruinose; inner dorso-centrals and "pra" 

 not differentiated from the setulae which are found among the macrochaetae; 

 dorso-centrals 2-1-3; sterno-pleurals 1-1-2, the posterior i)air rather more 

 widely separated than is usual with the Fhaoninae; four strong and four 

 weaker scutellar setae besides several setulae; the suba])ical setae shorter 

 than the basal pair. Abdomen shining black, longer than the thorax, tapering, 



