Vol. IX] COLE & LOVETT—NEIV OREGON DIPTERA 229 



12. Leptogaster aridus Cole, new species 



Miale: Length 9 mm. Face and mystax white; frons and occiput gray 

 pollinose ; bristles of upper occiput black, below with sparse white hairs ; 

 proboscis black; first antennal joint black, second yellowish, third brown 

 with an arista longer than the joint itself. 



Thorax gray pollinose, the ground color black; two rather obscure 

 brownish dorsal lines, and a brown spot on either side ; humeri yellow, 

 bristles of thorax black ; scutellum black, gray pollinose ; the pre-scutellar 

 callosities yellowish ; stem of halteres pale yellow, knob blackish. 



Ground color of abdomen dark brown; abdomen very slender, second 

 segment longest; the second, third and fourth segments cylindrical; pos- 

 terior margins of second to fifth yellow; legs yellow; the swollen part of 

 the hind femora, distal half of hind tibiae and last four joints of tarsi 

 brown ; hind tarsi much darker than others ; claws black ; empodia present ; 

 wings hj^line, the anal and posterior cells all wide open. Wings reach to 

 middle of fifth segment of abdomen. 



Female : Similar to male. Marks on dorsum of thorax more distinct ; 

 the two median stripes not reaching the scutellum'; abdomen darker, a 

 little heavier, the yellow posterior margins obscured by gray pollen ; small, 

 distinct black dots near the anterior margin of the abdominal segments ; 

 no yellow on fifth segment. 



Holotype (No. 474), male, from Hood River, Ore., July, 

 1917 (L. Childs), and allotype (No. 475), female, from 

 Forest Grove. Oregon, July 12, 1918 (F. R. Cole), in the 

 Museum of the California Academy of Sciences. 



Paratypes in the author's collection, taken at Forest Grove 

 in July. 



This species would run to Uavipes in Back's table of species, 

 in his Monograph. The bristles of the occiput are black, how- 

 ever, only the second antennal joint is yellow and the abdomen 

 is marked differently. 



13. Lasiopogon cinereus Cole, new species 



(Plate 15, fig. 11) 



Male : Length 8 mm. Head black, gray pollinose, except a faint yellow- 

 ish tinge on upper occiput ; mystax, and hairs of frons, antennae and upper 

 occiput black ; a few white hairs on side of mouth opening ; pile of lower 

 occiput and proboscis white ; antennae black, the third joint slightly longer 

 than first two; pointed style about as long as first joint. 



Thorax black, gray pollinose, with a faint yellowish, narrow median 

 stripe and a heavy brown stripe on either side, diverging anteriorly and 

 expanded at the end ; scutellum with black upcurved hairs ; pile and bristles 

 of thoracic dorsum black ; bristles in front of wings and halteres black ; 

 pile of pleura white ; halteres yellowish, the knob brown. 



Abdomen black, densely gray-poHinose, except on the genitalia ; a large 

 blackish brown, semi-shining spot on base of each segment, leaving only 

 the lateral and posterior margins gray-pollinose ; these spots rounded pos- 

 teriorly ; first four segments with rather long wliite pile ; the pile of the 

 other segments black and shorter, that on the genitalia black and heavier ; 

 a conspicuous tuft of black hair on the dorsum of the genitalia just behind 

 the seventh segment (Fig. 11a). 



