July asi] BANGS — NEW AMERICAN MAMMALS 69 
1699 
Skull, type: basal length, 58.6; occipitonasal length, 69.; zygomatic width, 
45.; mastoid width, 31.2; interorbital width, 14.4; width behind postorbital 
processes, 17.6; length of nasals, 27.8; length of single half of mandible, 
48.4 mm. 
Remarks.— Unfortunately the three specimens collected by 
Mr. Brooks at Okanagan are all youngish. ‘They are all alike, and 
show excellent characters to distinguish them from true 4. flavi- 
venter. In my large series of true A. faviventer I have many 
specimens of about the ages of the type and the two topotypes of 
A. f. avarus, and so am able to make proper comparisons. ‘The 
young of A. flaviventer do not differ in color from the adults. My 
specimens come from several places in the Sierra Nevada of Cali- 
fornia,— principally from Echo, and Mount Tallac. I think, 
judging from skulls that appear to be of the same age, that 4. 
flaviventer avarus is smaller than true A. faviventer. 
Sciuropterus alpinus lascivus' subsp. nov. 
Type, from Tallac, El Dorado Co., California, no. 9186, 2 adult, coll. of 
Kk. A. and O. Bangs, collected Aug. 28, 1898, by W. W. Price and P. O. 
Simons. 
General characters.— Similar in size and proportions to S. alpinus californt- 
cus Rhoads of the San Bernardino Mts., but much darker in color. Skull 
with longer nasals and rostrum and larger audital bulla. 
Color.— Upper parts, cinnamon russet, the slate gray of under fur showing 
through somewhat; upper surface of tail the same color, but darker towards 
end; under parts soiled buffy white, the under fur plumbeous; under surface 
of tail buffy isabella-color; top of head like back, ot paler; cheeks dark 
smoke-gray; ears blackish. 
MEASUREMENTS (in millimeters). 
No. Locality Sex and age Total length Tail vert. Hind foot Ear 
9186 = Tallac, Cala. 2 ad. 300. nis 39. 25.5 
ore; Mt. Tallac, Cala. Q ad: 320. 146. 43- 27. 
gt88 Echo, Cala. Pad: 303- 150. 39- 26. 
Skull, type: basal length, 34.6; occipitonasal length, 40.; zygomatic width, 
23.4; mastoid width, 20.6; width behind postorbital processes, 9.2; inter- 
orbital width, 8.; length of nasals, 13.2; length of palate, 18.6; length of 
single half of mandible, 24.4 mm. 
1 Lascivus —sportive, playful. 
