Vol. IX] COLE & LOVETT—NEW OREGON DIPTERA 227 



silvery tomentum; occiput with silvery tomentum ; oral margin narrowly 

 black; basal joints of antennae red with black pile, the third joint black 

 and evenly pointed. 



Thorax shining brownish-black with white and some yellow tomentum ; 

 yellow pile in front and white on sides and on scutellum; scutellum except 

 base brownish red ; spines whitish ; pile of pleura and pectus white ; hal- 

 teres brown with a yellow knob. 



Abdomen black with black and white tomentum ; white pile on sides of 

 first and second segments ; reddish spot on sides of second segment ; black 

 pile on lateral margins of third segment, posterior margin of second, 

 lateral margin of fourth and fifth and most of sixth ; base of third and 

 fourth segments with band of white tomentum broadly interrupted in the 

 middle, the second segment with a narrower cross-band; all of the seg- 

 ments with black tomentum; some tomentum on fifth and sixth segments 

 appearing brassy yellow in certain lights ; seventh segment thickly covered 

 with white tomentum and with long black pile ; venter black with white 

 tomentum, posterior margins of segments narrowly reddish. 



Legs with femora above, apex of tibiae and the tarsi blackish ; tomentum 

 of legs silvery white, the spines black; front claws minute, the tibije 

 without spines ; wings hyaline and blackish brown, the color not quite 

 reaching end of first vein and running from there in a jagged line back 

 to apex of the anal cell ; hyaline spots on cross-veins and elsewhere as 

 shown in Fig. 8. This species runs in Coquillet's table to fenestratoides 

 Coq. and is close to that species. 



Holotype, male (No. 519), and allotype, female (No. 520), 

 Dallas, Ore., July (Moznette, coll.), in the Museum of the 

 California Academy of Sciences. Paratypes in author's collec- 

 tion, from Hemiston, Ore., Sept. 14, 1918 (Reeher, coll.). 



10. Spogostylum argentatum Cole, new species 

 (Plate 15, fig. 9) 



Male : Face, frons and occiput dull black with a grayish tinge, clothed 

 with short black pile ; the antennae black with a short styliform portion 

 (Fig. 9a). 



Thorax dull gray-black with black pile and tomentum; pleura of like 

 color and black pilose ; halteres brown, the tips paler or whitish ; squamae 

 whitish with a white fringe ; scutellum blackish gray with black tomentum 

 and pile. 



Abdomen black, semi-shining, with black pile and tomentum; sides of 

 first segment with white pile, which runs up on dorsum for some distance, 

 and a spot of silvery tomentum at the incisure ; second and third segments 

 with a corresponding silvery spot and an additional pair each side of 

 median line with perhaps a few scales between; last two abdominal seg- 

 ments of male, except a median stripe, clothed with appressed silvery 

 scales which are smooth and catch the light like burnished silver. 



Legs black with fine short black bristles ; coxae with some whitish tomen- 

 tum ; basal half of wing opaque brownish black, the color reaching to the 

 end of costal cell and from there in a jagged line through the end of the 

 anal and axillary cells (Fig. 9). 



Female : Resembles the male. Frons broader ; lacking the silvery tip 

 to the abdomen ; anterior lateral margin of last segment with a few silvery 

 scales ; tip of abdomen with fringe of dense pale brown pile which curves 

 inward around the ovipositor. 



