688 



BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



Adult wtaZe.— Length (skins), 131-143 (135.8); wing, 55-62 (58.2); 

 tail, 56-67 (62.2); exposed oulmen, 10-12 (11.5); tarsus, 20-23 (21.6); 

 middle toe, 13-16 (14.6).^ 



Adult female.— \^%xi^t\i (skins), 127-135 (132.7); wing, 51-55 (54.6); 

 tail, 55-60 (58.2); exposed oulmen, 11-12 (11.5); tarsus, 19-21 (20.8); 

 middle toe, 13-15 (14.2).= 



Northern, western, and central Mexico; south to States of Morelos 

 (Yautepec, January) and Michoacan (Querendaro, August), north to 

 State of Sinaloa (vicinity of Mazatlan) and to the lower Rio Grande 

 Valley in Texas (Brownsville). 



GeotMypis poliocephala Baird, Review Am. Birds, April, 1865, 225 (Mazatlan, 

 Sinaloa, w. Mexico; coll. U. S. Nat. Mus.).— Salvin, Ibis, 1872, 149, part 

 (monogr.) . — Ridgway, in Baird, Brewer, and Ridgway'a Hist. N. Am. Birds, 

 i, 1874, 296 (Mazatlan).— La weence, Mem. Bost. Soc. N. H., ii, 1874,269 

 (Mazatlan). — Salvin and Godman, Biol. Centr.-Am., Aves, i, 1881, 154, pi. 9, 

 fig. 3 (Mazatlan).— Sharpe, Cat. Birds Brit. Mus., x, 1885, 359, part (Presidio, 

 near Mazatlan). 



\_Oeoihlypis] poliocephala Sclater and Salvin, Nom. Av. Neotr., 1873, 10, part. 



G^eoihhjjns] poliocephala Ridgway, Man. N. Am. Birds, 1887, 526. 



[TVichas] poliocephala Gray, Hand-list, i, 1869, 242, no. 3507. 



IGeothlypis poliocephala'] a. poliocephala Ridgway, Am. Jour. Sci., iv, Dec, 

 1872, 459. 



Geothlypis poliocephala var. poliocephala Ridgway, Am. Journ. Sci., iv, Dec, 

 1872, 459. 



[Geothlypis poliocephala'] var. poliocephala Ridgway, in Baird, Brewer, and Eidg- 

 way's Hist. N. Am. Birds, i, 1874, 296. 



[Geothlypis poliocephala] a. G. poliocephala Sharpe, Cat. Birds Brit. Mus., a, 



1885, 360, over list of specimens. 

 Geothlypis poliocephala palpehralis (not G. ptrfpeferafc Ridgway) Allen, Auk, viii, 

 1891, 316 (Brownsville, Texas). 



' Ten specimens. 

 ^ Six specimens. 



Specimens from Mexico compare in average measurements with those from 

 Brownsville, Texas, as follows: 



The series from Mexico is a very unsatisfactory one, but such as it is it seema to 

 invalidate the claims of G. p. ralphi as a recognizable form. 



