THE CANADIAN ENTOMOLOGIST. 223 



On sides of propodseum the yellowish-white hair is more or less mixed 

 with black. Coxae, trochanters and bases of femora on inner side with 

 whitish hair. Clothing of femora elsewhere brownish black. Corbiculse 

 rusty yellow. Integument of posterior tibi?e dark brown ; of tarsi light 

 yellowish-brown. Tarsi clothed with fine, bright yellowish-brown 

 pubescence. Wings slightly stained with brown, nervures brown. 



Dorsal surface of abdomen : First segment clothed on each side with 

 a tuft of ochreous-yellow pubescence, the space between being bare, or 

 nearly so ; second segment clothed with black, slightly mixed with 

 yellowish, except apical sides, where pubescence is pale ochreous-yellow; 

 third segment clothed similarly to second segment, except on extreme 

 sides, where the pubescence is also pale ochreous-yellow ; fourth segment 

 entirely clothed with pale ochreous-yellow pubescence ; fifth segment 

 clothed with black, more or less mixed with yellowish pubescence and 

 with a yellowish fringe on apical margin ; sixth segment scantily clothed 

 with short black and brownish hair, at apex, brownish, velvety. Ventral 

 surface : Segments two, three, four and five are fringed apically with 

 yellowish-white hair. Specimens from Prof R. A. Cooley, taken at 

 Middle Cr. Canon, Bridgen Canon and Bozeman (elev. 4,800 ft.), Mon- 

 tana, in June and July, 1899, and July, 1901, respectively. 



Colour variety A. Differs from type only in following details of 

 colour : clothing of second and third abdominal segments above, entirely 

 black, except for a few yellow hairs on apical sides of third segment. 



From Prof R. A. Cooley, taken at Bridger Mt., Montana, elev. 6,000 

 ft., June, 1899. 



Colour variety B. Differs from type only in colour of clothing of 

 third abdominal segment above, which is entirely ochreous-yellow, except 

 for a narrow band of black extending along the middle of the dorsum, 

 from the anterior to posterior margin of the segment, and a few black hairs 

 on the sides. 



From Prof. R. A. Cooley, taken at Bozeman, Montana, elev. 4,800 

 ft., June, 1 90 1. 



Described from three $ specimens ; one, the type deposited in the 

 collection of the Mass. Agric. College ; co-types deposited, one at the U. 

 S. Nat. Museum and one in the collection of the Montana Agricultural 

 College. Varieties A and B were described from one 9 specimen of 

 each, both in the collection of the Mass. Agric. College. 



I take pleasure in naming this species after my friend, Prof R. A. 

 Cooley, of the Montana Agric. College. 



