Remarks.—The late George Willett in the course of his work in Alaska collected most of the known specimens of this strongly differentiated subspecies. In both coloration and cranial characters the distinguishing features are so well marked that the zoölogist could with reason accord full specific rank to celenda. Nevertheless it obviously is an ermine. Also, races from other islands of southeastern Alaska tend to bridge the gap, as regards cranial features, between celenda and the mainland ermine. The specimen from Dall Island agrees in all respects with topotypes. The specimen from Howkan on Long Island is in white winter pelage and the skull has suffered shrinkage from some chemical solution; the reference of this specimen to celenda is tentative.
Specimens examined.—Total number, 25, as follows: Arranged by localities from north to south. Unless otherwise indicated, in U. S. National Museum.
Alaska. Prince of Wales Island: Craig, 18 (10 in Mus. Vert. Zoöl., and 8 in Los Angeles Mus. Hist. Art and Sci.); Kasaan Bay, 2; no locality more definite than the Island itself, 3; Dall Island, Otter Harbor, 1 (Los Angeles Mus. Hist. Art and Sci.). Long Island, Howkan, 1 (Field Mus. Nat. Hist.).
Mustela erminea seclusa Hall
Ermine
Mustela erminea seclusa Hall, Proc. Biol. Soc. Washington, 57:39, June 28, 1944; Hall, Journ. Mamm., 26:181, July 19, 1945.
Type.—Male, adult, skull alone; no. 31232, Mus. Vert. Zoöl.; Port Santa Cruz, Suemez Island, Alaska; March 24, 1920; obtained by George Willett.
The skull (plates [5]-[7]) is complete and unbroken. Of the upper incisors only right I3 is present. Otherwise the teeth are present and unbroken.
Range.—Known only from the type locality. See figures [25], [26] on pages 95, 134.
Characters for ready recognition (only the male known).—Differs from M. e. celenda in basilar length less than 38.2, from M. e. salva, initis and haidarum in zygomatic breadth more than distance between last upper molar and jugular foramen.
Description.—Size and Color.—No external measurements or skins available.
Skull.—Male: See measurements and plates [5]-[7]. As described in Mustela erminea richardsonii except that: Weight, 1.8 grams; basilar length, 34.3; length of tooth-rows about the same as length of tympanic bulla; breadth of rostrum measured across lacrimal processes more than a third of basilar length; interorbital breadth more than distance between glenoid fossa and posterior margin of external auditory meatus; zygomatic breadth more than distance between last upper molar and jugular foramen.
Female.—Skull not available.
From alascensis and salva, seclusa differs in larger teeth, shorter skull, much larger preorbital and interorbital regions, actually as well as in relation to basilar length. Excepting the teeth, which are of about the same size, the same general differences obtain in comparison with initis which, however, is 29 per cent heavier.
From celenda, seclusa differs in smaller skull in all parts measured, being 22 per cent lighter. The teeth are about the same size. In relation to its length the skull of seclusa is much broader and deeper. From haidarum, seclusa differs in: teeth larger; skull shorter and more convex in dorsal outline along median longitudinal axis; in relation to basilar length, skull broader, deeper and braincase relatively shorter.