Vol. XI] CURRAN— REVISION OF THE PIPIZA GROUP 369 



necting stripe on second and third segments, with black pile. Venter entirely 

 white pilose, the pile of the third and fourth segments appressed. Legs colored 

 as in the male; middle tibiae more rounded in front than usual. Wings hyaline ; 

 stigma luteous; last section of fifth vein bent at its middle. 



Male and female, Orillia, Ontario (Curran.) I do 

 not give various reported localities as I consider the 

 determinations doubtful. 



29. Cnemodon auripleura, new species (Figs. 23, 24) 

 Habitat: Oregon! California! British Columbia. Close- 

 ly related to carinata, but the face more largely black 

 pilose; pile of the pleurae more reddish; wings cinereous 

 or luteous hyaline; projection of middle tibiae strongest 

 at the middle. 



Male: Length, 6 to 6.5 mm. Face and frons shining bluish black, black 

 pilose; face in middle white pilose; sides narrowly white pollinose, in profile 

 slightly receding; frons slightly swollen, with small, roundish tubercle above 

 the antennae; vertical triangle white pilose, with a few black hairs in front; 

 post orbital pile whitish; occipital cilia black; eyes brownish pilose, lighter 

 below. Thorax yellowish white pilose; humeri with brown, pleurae with red- 

 dish, pile; scutellum with shallow apical groove, the pile yellowish white. 

 Abdomen shining metallic black, the usual areas opaque; pile black, with the 

 usual areas whitish; venter of third segment at apex and of fourth segment at 

 base, sharply carinate. (fn this species there is some variation in the base 

 of the fourth segment, in some specimens the carina is not very distinct, but 

 the base is strongly rugose.) Legs black; knees, anterior tibiae except an in- 

 complete median piceous band, tips of middle tibiae and first three or four joints 

 of anterior four tarsi, yellowish; middle tibiae piceous, its projection when 

 viewed from above abrupt at both ends; processes on middle coxae and hind 

 trochanters black. Wings cinereous- or luteous-hyaline; stigma luteous; last 

 section of fifth vein nearly straight. 



Female: Length, 5.5 mm. Face white pilose; frons brownish pilose, across the 

 middle and at the vertex with white pile. (In the two specimens it is impossible 

 to determine the extent of the pollinose spots.) Antennae black; second and 

 third joints yellowish below, third one and one half times longer than wide, 

 end evenly rounded ; arista yellow at base. Thorax and scutellum white pilose; 

 scutellum distinctly rugose, with an apical groove; pile towards the end grayish. 

 Abdomen rather broad; white pilose, with the usual areas shorter black pilose; 

 pile of venter sub-appressed. Legs black; tips of all femora, narrow base of 

 hind tibiae, and four anterior tarsi, yellow, the tarsi becoming darker toward 

 the apical joints which are blackish; front four tibiae yellow, piceous on outer 

 side. Wings luteous hyaline, basal third more clear; stigma yellowish; last 

 section of fifth vein bent before its middle. 



Twenty-five males and two females, Hood River, 

 Oregon (F. R. Cole), received from Professor Lovett. 

 One male, California, Mr. W. M. Davidson, and one 

 female, Cranbrook, B. C. (Garrett). 



Holotype, male, No. 863, Mus. Calif. Acad. Sci., June 

 16, 1917, F. R. Cole, collector. One male paratype in 

 Canadian National Collection. 



Type locality, Hood River, Oregon. 



