V0 'iS* VI ] Oberholser, A New Geothlypis. 257 



Geothlypis trichas arizela, subsp. nov. 



Chars, subsp. — Geothlypis G. t. occidentali similis sed minor, verticis 

 fascia albida magis restricta. 



AI., 53.5-59 (57.1) mm.; caud., 50-58.5 (54-4) mm.; culm, exp., 10-11 

 (10.4) mm.; tars. 19. 5-21 (20.2) mm. 



Geographic Distribution. — Pacific coast region from southern British 

 Columbia to northern Lower California; east to the Cascade Mountains 

 and to the -west slope of the Sierra Nevada; south in winter to Cape St. 

 Lucas and Tepic. 



Description. — Type, male adult, No. 7918, U. S. Nat. Mus. ; Fort 

 Steilacoom, Wash., May 13, 1856; Dr. Geo. Suckley. Upper surface 

 dull olive green, clearer on the rump, more brownish on the crown ; tail 

 olive green, brighter exteriorly ; wings fuscous, margined externally with 

 olive green; forehead and sides of head back to and including auriculars 

 black, bordered posteriorly by a rather narrow creamy white band, 

 broadest on the forehead ; throat and breast bright yellow, shading 

 gradually into the creamy buff of abdomen; crissum yellow, rather 

 paler than throat; sides conspicuously washed with brownish; bend of 

 wing below yellow; lining of wing huffy. 



Young in first plumage. — ^o. 101497, U. S. Nat. Mus. ; Fort Klamath, 

 Oregon, July 20, 18S3; Major Chas. E. Bendire. Above nearly uniform 

 warm olive brown, inclining to olive green on the rump; wings and tail 

 as in the adult, but the greater and median wing-coverts broadly tipped 

 with ochraceous ; lores dull yellowish; sides of head and neck like the 

 back; chin dull buffy yellowish; throat and breast yellowish, washed 

 with brownish; abdomen buffy; sides heavily tinged with brown; cris- 

 sum olive yellow. 



From occidentals the present race may be readily distinguished 

 by its much narrower white frontal band, and also by its 

 appreciably smaller size ; though the former character is of course 

 not available for determination of females and young. It differs 

 from trichas as does occidentalism but in dimensions not to so 

 marked a degree. Intermediates between trichas and occidentals 

 such as occur on the Great Plains, come sometimes rather close 

 to arizela, but the larger size of the latter, together with the 

 usually much less ashy shade of the light markings on the head, 

 will serve to distinguish the majority of specimens. 



A June bird from Tecate Valley, Lower California, seems to be 

 quite typical ; one of similar season from Owens Lake, California, 

 though intermediate, is, so far as may be judged from a single 

 individual, nearer arizela than to occidentalis. The solitary 



