1924] Swarth: Birds and Mammals of the Skeena River Region 341

as follows: Prince William Sound, Alaska, 2 specimens (including the
type of Dryobates pubescens glacialis) ; lower Taku River, Alaska, 2;
Skeena River region (Hazelton and Kispiox Valley), British Colum-
bia, 18; Warner Mountains, California, 4; Sierra Ancha, Arizona, 2.
In my opinion, the downy woodpeckers from these several points
should all be included under one name. As shown in the accompany-
ing table, the southern birds are slightly larger than the northern
ones, which is curious, considering north and south variation in general
in the genus Dryobates.. The southern birds are also somewhat blacker,
that is, with less white spotting upon wings and coverts. Individual
variation is such, however, that it is impossible satisfactorily to
diagnose two subspecies in the material examined.

For the application of. the name Dryobates pubescens leucurus
(Hartlaub) to the downy woodpecker of the Rocky Mountain region,
see Grinnell, 1923, p. 30.

TABLE 1
MEASUREMENTS IN MILLIMETERS oF Dryobates pubescens leucurus

Maus.

No. Sex Locality Date Wing Tail | Culmen
1287 of Prince William Sound, Alaska, Sept. 7, 1908 | 93 57 15.5
9732 fim.| Taku River, Alaska, Sept. 4,1909 | 92.5 | 56.5 | 15.8
9733 fof Taku River, Alaska, Sept. 13, 1909 | 97.5 | 58 15.2
42117 | Iispiox Valley, B C., July 13,1921 | 96.5 | 59 16.5
42115 | o& Tuspiox Valley, B. C., Sept. 5,1921 | 97 61 15
14137 | Warner Mts., Calif., June 29,1910 | 98 587 18.5
14138 | o@ Warner Mts., Calif., June 30,1910 |101 65 18
PAU TAKO) || Ge Sierra Ancha, Arizona, June 23,1917 | 99.5 | 65.5 | 18
1288* | Q Prince William Sound, Alaska, Sept. 18, 1908 | 97.5 | 61 15
42105 | @ Hazelton, B. C., June 16,1921 | 94 60 16
42108 | @ Kispiox Valley, B. C., June 29,1921 | 95.5 | 62.5 | 16
42111 | Qim.| Kispiox Valley, B. C., July 9,1921 | 95.5 | 61.5 | 16.5
42116 | @ Kispiox Valley, B. C., Sept. 8,1921 | 97.5 | ........ 15.5
14139 | @Q Warner Mts., Calif., June 30,1910 | 97.5 | 63.5 | 17.5
14140 | 9 Warner Mts., Calif., July 6,1910 |100 62 17
Peat || 2) Sierra Ancha, Ariz., June 25,1917 |100 67 17

* Type of Dryobates pubescens glacialis Grinnell.
7 Rectrices shortened by wear.

Picoides arcticus (Swainson). Arctic Three-toed Woodpecker

Not common. We had been in the region three weeks before seeing
a three-toed woodpecker of either kind. Picoides arcticus and P. a.
fasciatus were then both discovered, each in small numbers, and under
precisely the same conditions. They were in the lowlands, but inhabit-

Ne ane ae ae