398 AMERICAN HYMENOPTERA. 



yellow pile and with the coxse, trochanters and femora to their tips 

 bearing a large amount of light hair ; venter also bearing a consider- 

 able amount of light pile. Three specimens ; from British Columbia, 

 Nevada and California. 



Male Color Variant 5.— \J\\ie. Male Color Variant 4, but with first 

 five dorsal abdominal segments, except basal middle of third, entirely 

 covered with yellow pile ; pile on apical segment somewhat ferrugin- 

 ous ; hairs on tibiae more or less strongly ferruginous ; black interalar 

 band narrow. Several specimens : from Wyoming, Idaho, and Cali- 

 fornia. 



Habitat. — I have records of this species from all the Pacific 

 states and territories, except Montana and Arizona, from 

 western Kansas, Lower California, Alaska (probably south- 

 ern), British Columbia, Vancouver Island, Alberta and Sas- 

 katchewan. Judging from this distribution, it must also be 

 present in Arizona, western Oklahoma, western Nebraska, 

 Montana (though I have seen no specimens of it in three 

 Schmitt boxes full of bumble-bees from that state) and 

 Athabasca. It may be present in western Texas, western 

 South Dakota and northern Mexico. My most northern 

 record is Alaska ; most eastern, Kansas ; most southern. El 

 Rosario in Lower California and Magdalena Mountains in 

 New Mexico. It appears to be present in greatest abund- 

 ance in California, Oregon and Washington, being in Cali- 

 fornia one of the most common species. It seems to belong 

 mainly to the Canadian and Transition Zones. Handlirsch's 

 record, " New Orleans," is probably a mistake. Dr. David- 

 son states that, in southern California, it is " most commonly 

 found on the coast beaches ; less frequently in the San Ber- 

 nardino Mountains up to 6000 feet altitude." 



This species has by far its nearest ally in B. fervidus F., 

 from which I have been unable to separate it structurally. 

 There seems to be ground for supposing that sufficient col- 

 lecting may show that these two species intergrade com- 

 pletely. 



That the males here described go with the females of cali- 

 fornicus Smith, I have the following evidences : 



1. Genitalia. — By the genitalia, the males are at once and with cer- 

 tainty identified as Bontbus males and as males of the Dumoucheli 

 group. 



