250 University of California Publications in Zoology. |VoL-9 
the infraorbital foramen is very heavy and ends bluntly in a 
truncated knob. Nasals end very slightly posteriorly to pre- 
maxillaries. 
MEASUREMENTS.—Type: length, 680; tail vertebrae, 210; 
foot, 102. Average of three other adults: length, 680; tail, 204; 
foot, 97. Skull (type) : occipito-nasal length, 98.3; Hensel, 83.5; 
zygomatie width, 62; length of nasals, 38.5; width of nasals, 17; 
leneth of upper molar series, 23; diastema, 25. Average of three 
other skulls: occipito-nasal length, 98; Hensel, 82; zygomatic 
width, 63; leneth of nasals, 40; width of nasals, 17; length of 
lower molar series, 22; diastema, 25. 
Dixon found the glacier marmot abundant on the west shore 
of Glacier Bay near an abandoned copper mine. His notes for 
this locality are: ‘‘Marmots were seen daily on the grass-cov- 
ered hill tops or about the mossy boulders near the beach. They 
were not particularly shy and two were secured with a shotgun. 
The young at this time (July 10-20) were about half grown.’’ 
About Bartlett Cove, Stephens saw only a few tracks. 
Sciuropterus alpinus zaphaeus Osgood. 
Osgood Flying Squirrel. 
The four topotypes in the collection from Helm Bay are in 
summer pelage which is slightly lhehter than the winter pelage 
of the type and topotypes in the Biological Survey collection. 
Castor canadensis phaeus, new subspecies. 
Admiralty Beaver. 
Type from Pleasant Bay, Admiralty Island, Alaska; adult 
male, No. 209, Univ. Cal. Mus. Vert. Zool.; collected by A. Has- 
selborg, May 16, 1907; orig. No. 27. 
CHaracters.—Coloration above, dark seal brown, very much 
darker than leucodontus or pacificus. 
CoLoRATION.—The long hair of the upperparts is very dark, 
almost black, with a slight chestnut iridescence to the tips of 
the hairs, the individual hairs appearing decidedly blackish. 
Anteriorly the blackness gives way to a deep russet on the shoul- 
ders which lightens farther on the head to a chestnut-brown; 
