152 Bulletin American Museum of Natural History. [Vol. XVI,

gray above and below the eye, forming an imperfect eyering; but this
seems exceptional, and is probably a remnant of the summer coat, the
majority of the specimens having the eye region dark like the adjoining
parts of the face.

Female and Y oung-of-the-year.—The female does not appear to differ
materially from the male. The young-of-the-year, however, is much
lighter than the adult, having the whole ventral area white, and the
whole neck and the sides much lighter; the dark color of the upper
parts is lighter and restricted in area to the middle of the back from
the shoulders posteriorly; the tail is all white except at the base above.

Measurements—The following are the collector's measurements
taken from the freshly killed specimens before skinning:

EXTERNAL MEASUREMENTS.

No. 5 | No.6 |No. 7 | No 8.| No. 9
gad. | gad. | gad. | Gad. |@juv.
Motale len othe terrier 2083 | 2057 | 2210 | 2172 | 1930 | 1499
Mat eae cekatias waseneoe ite ses 152.4] 152.4] 152.4| 152.4] 177.8] 114.3
Height at shoulder...... 1321 | 1270 | 1346 | 1397 | 1245 991
linc pybOpat prea ee 1295 | 1334 | 1245 | 1359 | 1145 965
Length of hind foot......| 610 | 635 635 597 597 522
Horeslesutorel bows |iet5 O77 584 | 610 646 521 432
Waidthvotichestre sm. 326 320 368 368 305 220
Depiumonchesteapa ssere 775 787 787 749 711 610
IDBKeY aBXoyael CRON Ga duced oun |} omy 140 Od Os | aaeneeaive
mF DE SNOUCH yeti. cull Paetiepeee laa meN II5 TH Ove wean

Skull,—tIn addition to its large size, the skull of R. montanus is pe-
culiar in the unusual elongation of its facial portion. The antlers are
similar in length and proportions to those of the Barren Ground Car-
ibou, but more massive, with the palmated portions much broader
and heavier. (For measurements see p. 153.)

Of the six specimens collected by Mr. Stone in the Cassiar
Mountains, four are adult males, one is an adult female, and
the other a young-fo-the-year female. The female and three
of the males agree very closely in coloration; the other male,
apparently the oldest of the series, is much paler-colored
throughout.

* Collector's numbers. No. 6 = Mus. No. 15714; No. 8= Mus. No. 15715; No. 9 =
eae ae 15716. The original measurements, givenin inches, are here reduced to
millimetres.

2 Measurements from dry skins, exclusive of hair.