1909] The 1907 Alexander Alaska Expedition. 201 
much larger and proportionately wider zygomatically with a 
much greater diastema and less decurved upper incisors. 
In color admiraltiae is decidedly grayer than topotypes of 
drummondi. British Columbia specimens. are even darker than 
typieal drummondi. Bennett and Yukon specimens are closer 
to this gray coloration than any others, but they can usually be 
distinguished by their browner tints. April specimens from 
Windfall Harbor, still in the winter coat, do not differ much 
from August pelages from Hawk Inlet. 
A series of fifty-three specimens are in the collection from 
Windfall and Mole harbors and Hawk Inlet. This large series 
shows remarkably little variation in either proportions or col- 
oration. 
At Windfall Harbor both Stephens and Dixon found them 
abundant in the tall beach grass a little above high tide level. 
In this zone of grass their nests were found placed six to eight 
inches above the ground. Dixon reports them common in the 
grass about the mouths of creeks. At Hawk Inlet, Stephens 
found them abundantly in the grass about the harbor. At the 
lakes, Dixon found them common above timber-line in the 
heather. There their burrows were often found exposed where 
the bears had torn up the runways in an endeavor to secure 
the voles. 
Microtus sitkensis Merriam. Sitka Vole. 
The collection contains fourteen specimens from Baranot 
Island and five from Chichagof Island. The series from Ba- 
ranof agrees well with the type and single topotype in the Bio- 
logical Survey collection. The type and topotype both have 
abnormal first lower molars, the closed triangles of which have 
a formula of 5-4 and 4-5 respectively. In the series of thirteen 
adults from Baranof twelve of them are found to have a form- 
ula of 4-4 for these teeth, the single exception having the loops 
5-4 like the type. The Chichagof material with one exception 
has the formula 4-4 for the first lower molars. The series from 
this island averages larger with heavier skulls and longer hind 
feet; but the material is too scanty to determine the value of 
these slight differences. 
