Intergradation with _nevadensis_ is indicated by several specimens. The coloration of the one adult female, no. 90, Chas. R. Conner Mus., from Swamp Creek, Washington, has the color of the underparts extended down the hind legs over the feet, and over the proximal third of the ventral face of the tail as in _nevadensis_ although the other two specimens from the same place have the color pattern of _altifrontalis_. Of the four specimens from British Columbia referred to this subspecies, only the specimen from Chilliwack is typical as regards color pattern. The one from Cultus Lake has the color pattern of _nevadensis_ and might be referred to that race almost as well as to _altifrontalis_. The two specimens from Lihumption Park are intermediate between the two races in tone of color. Neither has the color of the underparts extended onto the tail or continuously over the hind feet as in _nevadensis_ but each does have the color of the underparts less restricted and of lighter hue than in _altifrontalis_. Only one of the specimens, no. 7848 Canad. Nat. Mus., from Lihumption Park is adult and it has a skull which agrees with that of _altifrontalis_ rather than _nevadensis_. After writing the above, a good representation of the weasel population along the eastern side of Puget Sound was made available by friends in that area. Study of the weasels from there shows that their color is intermediate between that of _altifrontalis_ and _nevadensis_. On the whole, they (specimens from Bellingham, for example) resemble one subspecies about as much as the other. In cranial characters some specimens, in certain features, approach _nevadensis_ but most specimens agree with _altifrontalis_ and all are more nearly like _altifrontalis_ to which race all are referred. The color of these animals is to me indistinguishable from that of _washingtoni_. The color of _washingtoni_ is merely intermediate between that of _nevadensis_ and _altifrontalis_. Nevertheless, the race _washingtoni_ has cranial characters (long narrow skull) which set it off from both _altifrontalis_ and _nevadensis_. This shape of skull is not found in the specimens from along the eastern side of Puget Sound; these animals have skulls like that of _altifrontalis_ and when departures from this occur they are in the direction of _nevadensis_ and not _washingtoni_. The above, then, explains why specimens which are colored like those of _washingtoni_ are not referred to that race but instead to the race _altifrontalis_. Of 23 adult skulls examined, 19 have the frontal sinuses malformed as the result of infestation by parasites. _Specimens examined._--Total number, 80, arranged within states by counties from north to south. Unless otherwise indicated specimens are in the United States National Museum. =British Columbia.= _Chilliwack_, 1[74], Lihumption Park, 4750 ft., 2[77]; Cultus Lake, 1[77].