Howell — A New Genus and New Races of Flying Squirrels. 113 



parts. It intergrades with lascivus in the region around Mt. Lassen, 

 with klamathensis in the Warner Mountains, and with fuliginosus in 

 the Siskiyou Mountains. 



Qlaucomys bullatus sp. nov. 



Type from Sawtooth (Alturas) Lake, Idaho. Adult female. No. |tlH) 

 U. S. Nat. Mus. (Biological Survey collection); collected September 28, 

 1890, by Vernon Bailey and B. H. Butcher; original number 1883. 



Characters. — Size large (about equaling O. sabrinus latipes ; much 

 larger than G. s. bangsi) ; color of upperparts similar to that of bangsi 

 but decidedly more ochraceous (less vinaceous) ; gray on face purer and 

 more extensive ; skull large, with narrow, deep braincase, the fronto- 

 parietal region markedly elevated; molars heavy; audital bullae very 

 large. 



Measurements. — Adult female (type) : Total length, 340; tail vertebrae, 

 150 ; hind foot, 46; average of 6 adults from Ketchum, Idaho: 836; 142 

 42.5. Skull (of type); Greatest length, 44; zygomatic breadth, 25 

 mastoidal breadth, 19; interorbital breadth, 8.7; length of nasals, 13.9 

 alveolar length of maxillary toothrow, 9.2. 



Remarks. — This species resembles certain of the forms of sabrinus 

 rather closely in color but is readily separated from all of them by its 

 peculiar skull with very large bullae. Its range, as now known, is from 

 Ketchum, Idaho, north to Cranbrook, British Columbia. At Sawtooth 

 Lake it occurs on the same ground with the much smaller O. s. bangsi 

 and at Cranbrook, B. C, occurs with O. s. eolumbiensis. 



