438 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 43. 



TABLE OF SPECIES. 



1. Hind tibiae with two bristles on basal half occidentata, p. 438. 



Hind tibiae with only one bristle on basal half 2. 



2. Small species, 1^2 nun.; fore tarsi not distinctly dilated though broader than 



other tarsi; frons of male parallel-sided aterrima, p. 439. 



Larger species, at least 2i mm.; fore tarsi very distinctly dilated; frons of male 

 wider above antennae than at vertex 3. 



3. Fore tarsal joints 2-5 at least as broad as long; fourth vein much bent at base. 



montana, p. 439. 



Fore tarsal joirfts all distinctly longer than broad; fourth vein slightly bent at 



base velutina, p. 439. 



PHORA OCCIDENTATA, new species. 



Like the other species of the genus, a deep velvety black, the 

 female less velvety than male, but opaque black, frons nearly parallel- 

 sided in female, in male distinctly broader at above antennae than at 

 vertex, the third pair of frontal bristles distinctly lower on frons than 

 anterior ocellus in male, less distinctly so in female; thorax with 

 numerous strong lateral bristles, two scutellar bristles; abdomen 

 with second and sixth segments elongated, hypopygium very large 

 and incurved, glossy black, with numerous long hairs, legs black, 

 the fore tibiae and all tarsi paler, fore tibise with distinct hair-like 

 setulae on antero-dorsal surface, longer on the niiddle, tarsi much 

 dilated and except at base of metatarsi as broad as tibiae, similar to 

 those of velutina, mid tibae with two antero-dorsal spines in both sexes, 

 postero-dorsal surface in male with six, in female with three or four 

 spines, the lower one at about two-fifths from apex, and the remain- 

 ing portion of tibiae with hair-like setulas, hind tibiae with two spines, 

 the smallest at one-fifth from base, the largest at rather more than 

 two-fifths from base, one spine at apex, all on antero-dorsal surface, 

 tip of dorsal surface of tibiae bare and glossy; wings clear, costa to 

 near middle in male, short of it in female, first division shorter than 

 second in male, as long as second in female, fourth vein slightly bent 

 at base and ending near to wing tip, seventh vein indistinct but 

 complete; halteres black. 

 • Length, 3-5 mm. 



Popoff Island, Alaska, July, 1899 (Harriman Exp., Kincaid), 

 labeled aterrima Meigen, by Coquillett, and recorded as such in the 

 Papers on the Expedition; White Mountains (^lorrison); KussUoff, 

 Alaska (W. H. Evans) ; Torrey's Lake, Wyoming (labeled velutina 

 Meigen, by Brues) ; and one specimen evidently of the same species 

 from Los Angeles, California (collection of CoquiUett). Possibly 

 this last wrongly labeled as to locality. 



Type.— C&t. No. 14832, U.S.N.M. 



