1909] The 1907 Alexander Alaska Expedition. 261 
The distinctive characters of this form are chiefly in the last 
upper molar, which is greatly enlarged. The only form with 
which this needs comparison is energumenos. The difference 
in size between the upper molars of these two races is so great 
that it ean be readily determined by measurement. (See figures 
3 and 4.) Measurements taken of this tooth in the largest skulls 
available give almost a millimeter difference in both diameters 
in_the two forms. Jngens and energumenos have the upper mol- 
ars of about the same actual size, which makes them relatively 
much less in the large-skulled ingens and throws this northern 
race farther from nesolestes. All the cheek teeth are large and 
erowded in nesolestes, but the upper carnassial is no longer 
actually than in ingens. 
Specimens from Prince of Wales, Kupreanof and Baranof 
islands show the enlarged last upper molars of the Admiralty 
specimens with which they also agree in size and coloration. 
Skulls from Revillagigedo and Vancouver islands and the 
Cleveland Peninsula have somewhat smaller molars. These ap- 
parently represent forms intermediate with energumenos. This 
mink in its typical form will doubtless be found to be confined 
to the Alexander Archipelago. 
MEASUREMENTS.—Type: total length, 615; tail vertebrae, 
182; hind foot, 80. Average of three adult males: total length, 
604; tail vertebrae, 177; hind foot, 79. Skull (type) : oceipito- 
nasal length, 65; zygomatic breadth, 43; breadth at postorbital 
processes, 19; mastoid width, 36; greatest diameter of upper 
molar, 7.4; width of upper molar, 5.2. 
Putorius cicognani Bonaparte. Bonaparte Weasel. 
A female from Helm Bay is in the collection. This speci- 
men agrees minutely in coloration and skull characters with 
specimens of cicognani of the same age in the Biological Survey 
collection. 
Putorius cicognani alascensis Merriam. Alaska Weasel. 
The collection contains five specimens from Saook Bay, Ba- 
ranof Island, covering dates from September to November. 
This small series ranges from the light brownish pelage of early 
