NO. 1938. TSS DIPTEROUS FAMILY PHORIDX—MALLOCH. 439 



PHORA ATERRIMA Meigen. 



The smallest species of the genus so far described. The frons 

 of the male is parallel-sided; the thoracic bristles are strong, especially 

 those on near lateral margins of dorsum above wing base, but they are 

 not so numerous laterally as in the larger species, the fore tibiae have 

 no distinct setulose hairs, though broader than other tarsi the fore pair 

 are narrower than tibiae, mid tibiae with one antero-dorsal bristle in both 

 sexes, postero-dorsal surface with, four long spines in male and two or 

 three in female; hind tibial bristles at about basal third and apex; 

 wings clear, costa to middle, gradually thickening toward apex, 

 fii-st division distinctly but not greatly longer than second, fringe 

 barely longer than diameter of costal vein, fourth vein shghtly curved 

 at base and ending very near to wing tip, halteres black. 



Length, 1^-2 mm. 



Two males, Natrona, Pennsylvania, July, 1895 and 1896 (no col- 

 lector's name). I have also seen it from Chicago, and Ithaca, New 

 York (0. A. Johannsen). Brues records it from Mississippi, Penn- 

 sylvania, Kansas, South Dakota, Illinois, l^Iichigan, and Texas. 



PHORA MONTANA Brues. 



A very distinct large species. There are five or six spines on postero- 

 dorsal surface of mid tibiae in male and only two in female, the antero- 

 dorsal surface has only one bristle, the hind tibiae have one bristle; 

 and the base of fourth vein is more distinctly bent than in the other 

 species of the group. 



Type-locality, Magdalena Mountains, New Mexico. Types in col- 

 lection of the IT. S. National Museum. 



PHORA VELUTINA Meigen. 



A common and very widely distributed species. Separable from 

 the above by its having five to seven postero-dorsal mid tibial spines 

 in male and two to three in female; the fourth vem is also less bent 

 at base; the hind tibiae have only one spine; there are also generally 

 two spines on antero-dorsal surface of mid tibiae. 



XocaZiiies.— California, Idaho, Massachusetts, Kansas, Mchigan 

 (Brues), Alaska, Wlnte Mountains (in collection). 



PSEUDOHYPOCERA, new genus. 



Head large, frons with two post-antennal, nearly erect bristles, 

 two rechnate bristles nearly in line horizontally with these, aU four 

 occupying but little more than one-third the width of the frons and 

 nearly on the front margin, sometimes a very minute pair of bristles 

 is present anterior to the central pair in the female, a second row con- 

 sisting of two lateral bristles very near to the eye margin and nearly 

 midway to the antero-ocellar row of four, vertical row as in ApUo- 

 chseta; male antennae elongate-oval, large, arista subapical, bare, 



