296 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.43. 



tinctly silvered, narrower than frons and of nearly uniform width. 

 Occiput silvered below but on upper portion black, antennae black, 

 third joint elongate and distinctly acuminate, silvered, especially 

 apically, arista swollen and glossy black at base; thorax slightly 

 gray-dusted, with scattered pale hairs, humeri whitish, with dis- 

 tinct, long, downy, pale hairs, pleurae gray-dusted, scutellum gray- 

 dusted and with very few weak hairs, squamae white; abdomen 

 short and broad, tapering toward apex, subopaque, first segment 

 gray-dusted laterally, and with distinct lateral comb, other seg- 

 ments only indistinctly gray-dusted low down laterally, a few 

 scattered hairs in the last three segments, ovipositor long, reaching 

 to second ventral segment, distinctly longer than its base; legs 

 black, only knees, bases of tarsi, claws and pulvilli yellowish, no 

 distinct leg bristles and but little pubescence present, wings clear, 

 inner cross vein distinctly beyond end of first vein and middle of 

 discal cell, outer cross vein slightly shorter than last portion of fifth 

 vein; halteres with brown pedicel and whitish yellow knob. 



Length, barely 2 mm. 



One female, Medicine Hat, Alberta, Canada, October, 1911 (Mal- 

 loch). 



Type.—Csit. No. 14804, U.S.N.M. 



Very close to suhnitens Cresson, which is represented by a female 

 from Victoria, Texas, in collection. This latter stood as aridus 

 Williston, in collection, but it agrees with Cresson's description of 

 suhnitens. The above species differs from that of Cresson in having 

 no distinct bristles at base of fore femora, in venation, and in color 

 of legs. 



PIPUNCULUS TRICH^TUS, new species. 



Female. — Frontal stripe broadest at middle, distinctly silvered on 

 lower two-thirds, a distinct raised central tuberculate central point 

 on lower third of frons, face nearly as wide as frons at above antennae 

 at upper edge, widening toward mouth edge, antennae black-brown, 

 third joint with its apical third forming an elongate acuminate 

 point, grayish on acuminate portion, arista swollen at base, elongate 

 oval, occiput silvered below and on sides; thorax opaque, distinctly 

 gray pollinose anteriorly, humeri brown, lateral margins* of thorax 

 with several long pale hairs in front of wing base, pleurae distinctly 

 gray pollinose, scutellum shining black, two or three weak, black hairs 

 on posterior margin, postnotum gray pollinose; abdomen subopaque, 

 short and broad, basal segment gray pollinose, the lateral comb con- 

 sisting of numerous long black hairs, second segment nearly entirely 

 gray pollinose, other segments with very distinct lateral gray pollinose 

 spots forming shortly interrupted hind marginal fasciae, only a few 

 very short pale hairs scattered over abdomen, ovipositor of medium 



