270 AMERICAN HYMENOPTERA. 



with the scutellum usually strongly yellow. Many specimens, from 

 Washington, Montana, Alaska, Colorado and Utah. 



Color Variant J.— Queen and worker like Color Variant 2, but with 

 the fourth dorsal abdominal segment entirely black ; scutellum black. 

 One worker from New Mexico and one queen from Colorado. 



Color Variant 4-.— {B. proximus Cress.). Queen and worker like 

 Color Variant 3, but with the apical margin of the fourth dorsal ab- 

 dominal segment usually fringed with white pile, the whole of the 

 third segment and often an apical fringe on the second, of yellow pile 

 and the scutellum more or less yellow. Many specimens from Colo- 

 rado, British Columbia, Alaska and Utah. 



Color Variant 5. — Queen and worker like Color Variant 4, but with 

 the extreme sides, as well as the apical margin ; of the second dorsal 

 abdominal segment bearing yellow pile. Many specimens from Alaska, 

 British Columbia, Colorado, New Mexico and Utah. 



Color Variant 6 . — {Coloradensis Titus). Like Color Variant 4, but 

 with the fourth dorsal abdominal segment entirely covered with white 

 pile. Rare in Colorado and western Nebraska. 



Color Variant 7. — Queen like Color Variant 6, but with the apical 

 margin of the second dorsal abdominal segment bearing yellow pile 

 and the sides of the segment also with a large amount of pile of the 

 same color ; the scutellum entirely covered with yellow pile and the 

 black interalar band with considerable yellow hair admixed. Three 

 queens from Montana, Colorado and Utah. 



Color Variant 8. — Worker like that of the typical form, but with the 

 abdomen entirely black. Two specimens from Oregon and California. 

 Color Variant 9. — Worker like that of Color Variant 4, but with the 

 second dorsal abdominal segment, except the very basal middle, en- 

 tirely covered with yellow pile ; mesopleura covered with yellow to the 

 bases of the legs. A single specimen from Colorado. 



Male Color Variant 1. — Like the typical male described above, but 

 with the apical portion of the fourth dorsal abdominal segment bear- 

 ing white pile ; some touches of yellow hair often present about the 

 bases of the legs. Several specimens from Alberta, British Columbia, 

 Washington and Montana. 



Male Color Variant 2.— Like Male Color Variant 1, but with the 

 fourth dorsal abdominal segment entirely covered with white pile and 

 with touches of yellow pile on the sides of the second dorsal segment. 

 One specimen from Washington. 



Male Color Variant 3 . —Ui'ke Male Color Variant 1, but with touches 

 of yellow pile on the sides of the second dorsal abdominal segment. 

 One specimen from Washington. 



Male Color Variant 4. — Like the typical form, but with touches of 

 yellow pile on the sides of the second dorsal abdominal segment. Two 

 specimens, from Washington and Montana. 



