116 Annals Entomological Society of America [Vol. XII, 



gray pollinose, more dense in some places than others giving a mottled 

 appearance from some views; sixth and seventh segments silvery, 

 hypopygium rather small, dark colored from dorsal view, sides nearly 

 parallel, angular at extreme apex. 



Female. Total length 21 millimeters. Colored like the male. 

 Sixth and seventh abdominal segments, from side view, wedge shaped 

 at tip, from dorsal view not furcate apically. 



Type: Male and allotype, from Vernon, B. C, August 11 

 and 15, 1904. Collected by the late Captain R. Valentine Har- 

 vey for whom the species is named. 



This species suggests bicaudatiis but the structure of the 

 oviduct is very different and the second submarginal cell is 

 shorter. 



Erax snowi n. sp. 



Male. Total length 22 millimeters. All the bristles of the head 

 except four bristles near the ocelli pale yellowish tinged, thoracic 

 dorsum and disc of scutellum black hairy, bristles near the wing roots 

 and on the margin of the scutellum pale yellowish, pleura with pale 

 hair, legs largely black with abundant long pale hair and black and 

 pale bristles, basal half of each front and middle tibia and basal fovirth 

 of each hind tibia reddish, although not conspicuously so. Wings 

 faintly yellowish hyaline, furcation of the third vein nearly opposite 

 the base of the second posterior cell, stump about the length of the 

 basal section, first three abdominal segments mostly black, thinly 

 yellowish pollinose laterally, with black hair above and pale yellowish 

 and rather long hairs at the sides; fourth segment narrow black before 

 and on the middle of the- dorsum, white pollinose and long white haired 

 laterally, fifty, sixth and seventh segments silvery and with a few short 

 white hairs. Hypopygium black, mostly with pale vestiture, of medium 

 size. 



Female. Size and coloration yery nearly as in the male. Abdomen 

 entirely yellowish gray pollinose and pale haired, from some views 

 more or less shining; oviduct black, scarcely as long as the last three 

 abdominal segments. 



-h^ 



Type: Male and allotype, from Clark County, Kansas, 1962 

 feet elevation, taken in May by F. H. Snow, for whom the 

 species is named. In the author's collection. More than fifty 

 other specimens from Kansas, Colorado, New Mexico and 

 Texas, show some variation in size, and a little in color of 

 bristles, but may be said to be quite uniform. 



Some specimens have more black bristles on the posterior 

 part of the mesonotum and on the margin of the scutellum than 

 the type. 



The color of the abdomen distinguishes the species from 

 all others except plenus which has very different male genitalia. 



