414 University of California Publications in Zoology. (Vou. 
Penthestes rufescens vivax, new subspecies. 
Valdez Chestnut-sided Chickadee. 
TypPe.—/ adult; no. 1368, Uniy. Calif. Mus. Vert. Zool. ; La- 
touche Island, Prince William Sound, Alaska; July 18, 1908; 
collected by A. M. Alexander. 
CHaracters.—hike Penthestes rufescens rufescens in colora- 
tion, but larger, tail proportionately longer and bill bulkier. 
Disrrisution.—As far as known only the Prince William 
Sound region of Alaska; fifteen specimens at hand, from Haw- 
kins, Hinchinbrook, Montague, Green, Latouche, and Knight 
islands, and head of Port Nell Juan. 
Remarxs.—The accompanying tables of measurement show 
the actual size in certain respects of the specimens from Prince 
William Sound, and also of a like number of examples from the 
Sitkan district, the latter being that portion of the known habitat 
of the true P. r. rufescens nearest to that of the form here de- 
seribed as new. An interval of over 400 miles, from which I 
have found no records of this sort of chickadee, constitutes an 
apparent gap between the two. 
List and measurements of 12 adult examples of Penthestes 
rufescens vivax from the Prince Wilham Sound region, Alaska: 
Date Bill from 
No. Locality Collector 1908 Sex Wing Tail Culmen Nostril 
1362 HawkinsId. A.M. Alexander June 18 ¢ 623 57.2 92 (7.2 
1363 HawkinsId. A.M.Alexander June 21 of 624 58.8 96 7.7 
364 HawkinsId. A.M.Alexander June 22 ¢ 65.0 59.5 92 71 
357 HawkinsId. L. Kellogg June 238 92 59.6 57.0 93 7.2 
1358 Hinchin- 
brook Id. L. Kellogg June 20 9 59.5 56.9 98 7.5 
1365 Hinechin- 
brook Id. A.M. Alexander June 25 @ 65.0 59.8 9.0 7.4 
1366 Hinchin- 
brook Td. A.M. Alexander July 1 fo 63:5) «6107 9 es 
1369 MontaguelId. A.M. Alexander “July 23 Q(?) 59.7 57.8 9.2 7.4 
1359 Montagueld. J. Dixon July 9 of 634 57.5 9:6 79 
1360 Green Id. J. Dixon July 14 g 65.0 59.8 94 7.5 
1368 LatoucheTd. A.M.Alexander July 18 ¢ 65.9 61.1 re = ie) 
1361 Latouche Id. J. Dixon July 20 ¢ 640 590 94 7.3 
Average of the 10 males.................- 63.44 59.14 9.384 7.5+ 
