492 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



COMPSOTHLYPIS PITIAYUMI INSULARIS (Lawrence). 

 TRES MARIAS PARULA WARBLER. 



Similar C. j)- pidchra, but larger; flanks darker, much tinged with 

 grayish and more or less strongly tinged with chestnut; white on 

 wing-coverts more restricted (as in O. j)- nigrilora); subterminal 

 white spots on inner web of lateral rcctrices smaller, present on only 

 one or two, instead of two or three; adult male with lores and orbits 

 not distinctly darker than pileum and auricular region, or at least not 

 approaching black. 



Adult w?«/6^— Length (skins), 106,7-115.6 (118); wing, 54.1-59.2 

 (57.4); tail, 45.7-52.6 (48.8); exposed culmen, 9.-J-10.4 (9.9); tarsus, 

 18.5-19.8 (19); middle toe, 9.9-10.4 (10. 2). ^ 



Adult female.— LQwgih. (skins), 106.7-109.2(108.4); wing, 5,3.3-55.4 

 (54.6); tail, 46-49 (47.2); exposed cuhiien, 9.6-10.2 (9.9); tarsus, 

 18-18.5 (18.3); middle toe, 9.6-10.4 (9.9).^ 



Tres Marias Islands, western Mexico. 



Parula pitiayumi {not Sylvia pit iayumi Vieillot) Baird, Review Am. Birds, 1865, 

 266 (Tres Marias Lsland.s, w. Mexico). 



Parula insular Is Lawrence, Ann. Lye. Nat. Hist. N. Y., x, Feb., 1871, 4 (Tres 

 Marias Islands, w. Mexico; coll. U. S. Nat. Mus.); Proc. Bost. Soc. N. H., 

 xiv, 1871, 278 (Tres Marias); Mem. Bost. Soc. N. H., ii, 1874, 269, part (Tres 

 Marias).— Salvin and Godman, Biol. Centr.-Am., Aves, i, 1880, 121, part 

 (Tres Marias).— Sharps, Cat. Birds Brit. Mus., x, 1885, 643, part (Tres 

 Marias) . 



[Parula pitiayumi'] var. insularis Baird, Brewer, and Ridgway, Hist. N. Am. 

 Birds, i, 1874, 207 (Tres Marias). 



{Parula pitiayumi.] Subsp. y. Panda imularis Sharpe, Cat. Birds Brit. Mus., x, 

 1885, 263, exd. syn. part and locality " Socorro." 



Compsoihlypis iumlaris 8te.js-eger, Auk, i, Apr., 1884, 170, excl. syn. part. — Nel- 

 son, N. Am. Fauna, no. 14, 1899, 55' (habits, etc.; crit.) 



Clompsothlypis] insularis RuxiWAV, Man. N. Am. Birds, 1887, 492. 



COMPSOTHLYPIS GRAYSONI Ridgway. 

 SOCORRO WARBLER. 



Adults (sexes alike). — Alwve plain dull gray, sometimes strongly 

 tinged with greenish olive, the interscapulars olive-green, forming a 

 triangular patch; middle and greater wing-coverts rather broadly 

 tipped with white, passing into brownish gray on innermost feathers; 

 inner webs of lateral rectrices edged with white, but without any well 

 defined white sul)terminal spot; loral and suborbital regions dull 

 grayish, flecked with whitish or pale yellowish; sides of head and neck 

 grayish, like pileum, etc., but somewhat paler; malar region, chin, 

 throat, chest, and whole In-east rather light dull gamboge or canary 

 yellow, scarcely, if at all, deepening in color on chest; abdomen and 

 anal region very pale yellowish; under tail-coverts yellowish white; 



' Twelve specimens. '^ Six specimens. 



