230 CALIFORNIA ACADEMY OF SCIENCES [Paoc. 4th See. 



Legs black, igray-pollinose, with black bristles; coxae and femora with 

 white pile ; wings very faintly infuscated ; anterior cross-vein slightly be- 

 fore the middle of the discal cell. 



Female: Very similar to the male. There is a faint brown line above 

 the dorso-pleural suture and some black pile on the posterior margin of 

 the second, third and fourth abdominal segments; eighth segment black 

 with some red on the genitalia; the circlet of blunt bristles black. Geni- 

 talia peculiar in shape (Fig. lib). 



Holotype (No. 476), male, collected at Hood River, Ore., 

 Sept. 24, 1918 (F. R. Cole), and allotype (No. 477), female, 

 taken at Hood River, Oregon, July 28, 1917 (F. R. Cole), in 

 the Museum of the California Academy of Sciences. 



Paratypes from Corvallis and Parkdale, Oregon, in the 

 author's collection. 



This species is very near opaculus but differs in having dis- 

 tinct thoracic stripes and also in the abdominal markings. 



14. Dioctria vertebrata Cole, new species 

 (Plate 16, fig. 12) 



Female: Length 5.5 mm. Head, antennae, proboscis and palpi black; pile 

 of antennae brown; face densely pollinose, golden above, silvery below; 

 mystax consisting of a few whitish hairs ; occiput and frons shining black ; 

 antennal protuberance prominent; antennae quite long as in some of the 

 European species; third joint flattened. 



Thorax and pleura shining black; the metanotum, a line from root of 

 wing to humeral callosity, and dividing line between meso- and ptero- 

 pleura silvery pollinose ; scutellum black with short golden pile ; two lines 

 of thin golden pile on dorsum of thorax; halteres yellow. 



Abdomen black and yellow banded, almost bare ; first segment black, 

 second black at base and on posterior margin; third and fourth yellow 

 with a broad black band across the middle; fifth, sixth and seventh black 

 with narrow yellow posterior margins ; venter yellowish. 



Legs including coxae yellow, with yellow bristles and pile ; coxae silvery- 

 pollinose ; claws except base, black ; last tarsal joint brown ; wings rather 

 long and slender as shown in figure ; veins black ; membrane hyaline ; costal 

 margin with fine, short pile. 



Holotype (No. 478), female, collected at Parkdale, Ore., 

 July 12, 1917 (Cole), in the Museum of the California 

 Academy of Sciences. 



This species is nearest rubida Coq., but differs in having 

 yellow coxae and tarsi, hyaline wings, etc. 



15. Cyrtopogon auratus Cole, new species 



(Plate 16, fig. 13) 



Male: Length 11 mm. Black; face gray-pollinose, the frons yellowish 

 gray; oral margin with black hairs, the mystax above it thick and golden 



