364 CALIFORNIA ACADEMY OF SCIENCES [Proc. 4th Ser. 



thirds the width of the segments. Front and middle tibia? with broad blackish 

 median bands; hind tibiae with only the basal quarter yellow; first two joints 

 of front and three of middle tarsi, yellow, the remaining joints becoming brown- 

 ish. Last section of the fifth vein rectangular, curved outwards at apical third 

 or quarter. 



Twenty-five males and 14 females, Guelph, Orillia 

 and Vineland, Ontario, (Curran). 



I have no doubt about this being Loew's Pipiza 

 calcarata, as my specimens agree entirely with his 

 description. No mention is made of the process on the 

 middle coxae, but, as the hind coxal spur is not men- 

 tioned, it cannot be any of the following species. The 

 female has been largely confused with pisticoides. 



21. Cnemodon corvallis, new species (Figs. 25, 34) 

 Habitat: Oregon! Anterior four tarsi with only the 



first joint yellow; pollinose spots on the front separated 

 by not quite the width of one spot; middle femora con- 

 siderably rounded in front; third joint of antennae 

 rather large, slightly longer than wide; wings hyaline. 



Female: Length, 5.5 mm. Face and front shining black; face receding 

 to below middle, thence perpendicular to oral margin; sides narrowly whitish 

 pollinose; frons white pilose at vertex and very narrowly across the middle, 

 elsewhere blackish; pollinose spots large, their ends rounded, not separated by 

 more than width of one spot and not connected with the side stripes; antennae 

 black; third joint reddish yellow below, rather large, slightly longer than wide, 

 evenly rounded above, more pointed below; arista black, yellowish at base. 

 Thorax and scutellum shining metallic black, short white pilose; the latter 

 with a shallow apical groove. Abdomen shining black, short white pilose, 

 with the usual areas black pilose. Legs black, knees and first joint of middle 

 tarsi yellow; first joint of front tarsi piceous yellow. Wings hyaline, stigma 

 luteous; last section of fourth vein bent at its proximal third, of the fifth 

 curved beyond its middle. 



Holotype, female, No. 855, Mus. Calif. Acad. Sci., 

 A. L. Lovett, collector. 



Type locality, Hood River, Oregon. 



While I have several female specimens belonging to 

 this genus which I cannot place but which evidently are 

 not those of described species, I consider the characters 

 of this form so distinct that I describe it here as a new 

 species. I have no doubt that the male, when found, 

 will be readily associated with the female. 



22. Cnemodon placida, new species (Figs. 20, 22) 



Habitat: Oregon! Wings pellucid hyaline; stigma 

 luteous; projection of the middle tibiae very broad, its 



