THEODORE H. PRISON 309 



localities. The capture of the at present unknown male of 

 variety alexanderi will settle this question as to its relationship 

 with polaris and kirhyelliis, as the males of these latter two species 

 are readily separated by genitalic characters. 



Bremus kirbyellus var. arizonensis new variety 



Qvieen. — Similar in all respects to kirbyellus var. alexanderi except that the 

 pubescence on the apical dorsal abdominal segments is entirely black, the 

 scutellum is not so strongly yellow, the yellow pile on the mesopleura extends 

 only half way down the bases of the wings to the bases of the legs, and the 

 malar space is slightly shorter. 



Holotype. — queen, July 11, 1917, Patagonia Mountains, 

 Arizona. Collector, E. J. Oslar. 



The holotype queen of this melanic variety is in the collection 

 of the author. 



The status of variety arizonensis is the same as that of variet}' 

 alexanderi, and for the same reasons as in the case of the latter 

 variety has been treated as most closely related to kirbyellus. 

 Variety arizonensis will run to hyperboreus Schonherr ( = arc- 

 ticus Kirby) in Franklin's key to the buml)lebees published in 

 1913, a species restricted to the northern parts of Eurasia, 

 Greenland and the extreme northern jiortions of North America. 

 Thus a striking example of color homomorphism in different 

 species from widely separated regions is preseiited. These two 

 buml)l(>b(»es are distinctly separated by the great difference in 

 the length of the malar space. 



Bremus sylvicola var. lutzi new variety 



Queen. — Taxonomically almost identical with the typical sylricola (Kirby) 

 found in Alaska and the far northern regions. Face in two specimens black, 

 in four specimens with a slight amount of yellow pile on the very middle 

 portion. Occiput with varying amounts of dark and yellow pile, the dark 

 pile dominating in most specimens. Yellow i)ile on the pleura of the thorax 

 not extending to the bases of the legs and in most specimens but half way 

 down from the bases of the wings to the bases of the legs. First dorsal ab- 

 dominal segment yellow, except basal middle portion which often has some 

 black pile; second and third segments ferruginous, with some black pile on 

 their middle portions; fourth segment yellow with black pile on the middle 

 portion; fifth and sixth segments almost entirely black. 



Holotype. — queen, July 11, 1917, Patagonia ^fountains, 

 Arizona. Five paratopotype queens, Jidy 11, 13 and 14, 1917, 

 Patagonia ^Mountains, Arizona. All the specimens collected by 

 :\Ir. E. J. Oslar. 



TRANS. AM. ENT. SOC. XLVHI. 



