BIRDS OF NORTH AND MIDDLE AMERICA. 



731 



tail, 46.5-50.5 (49.4); exposed culmen, 11-12 (11.1); tarsus, 18-19 (18.2); 

 middle toe, 8.5-9.5 (9).« 



Western Mexico, from southern Sonora (Alamos; Culiacan) to Oaxaca 

 (Tehuantepec; Santa Efigenia; Puerto Angel; Huilotepec; Tapana; 

 Cuicatlan; Quiotepec); Pacific coast of Central America.* 



Polioptila nigriceps Baird, Review Am. Birds, July, 1864, 69 (Mazatlan, Sinaloa, 

 Mexico; coll. U. S. Nat. Mus. )• — Lawrence, Mem. Bost. Soc. Nat. Hist., ii, 

 1874, 267 (Mazatlan; Tepic); Bull. TJ. S. Nat. Mus., no. 4, 1876, 13 (Tapana, 

 Santa Efigenia, and Quiotepec, Oaxaca). — Salvin and Godman, Biol. Centr.- 

 Am., Aves, i, 1880, 52, part (Mazatlan; Tepic; Tapana, Santa Efigenia, and 

 Quiotepec, Oaxaca; La Union, Salvador (?)). — Shaepe, Cat. Birds Brit. Mus., 

 X, 1885, 447, part (La Union, Salvador «). — Bkbwsteh, Bull. Nutt. Orn. Club, 

 vi, 1881, 105 (crit.). 



IPolioptUa] nigriceps Gray, Hand-list, i, 1869, 237, no. 3443. 



P[olioptila] nigriceps Ridgway, Proc. U. S. Nat. Mus., v, 1882, 387 (crit., range, 

 etc. ) ; Man. N. Am. Birds, 1887, 570. 



Plolioptila] nigriceps nigriceps Hbllmayr, Novit. Zool., vii, Dec, 1900, 538, part 

 (Mexico); viii, 1901, 358, 360, part (Mazatlan; Tepic; Oaxaca; Tehuantepec; 

 Salvador?); Tierreich, 18 Lief., 1903, 25, part (Mazatlan; Tepic; Oaxaca; 

 Tehuantepec; Salvador?). 



Polioptila nigriceps restricta Brewster, Descr. Sup. New Birds from Western N. 

 Am. and Mex., Jan. 31, 1889, 97 (Alamos, s. Sonora; coll. W. Brewster); 

 Auk, vi, Apr., 1889, 97. 



P[olioptila] nigriceps restricta Hellmayr, Novit. Zool., vii, 1900, 538, part ("Sud" 

 Mexico <«); viii, 1901, 358; Tierreich, 18 Lief., 1903, 26. 



POLIOPTILA PLUMBEA (Baird). 

 PLnUBEOlIS GNATCATCHER. 



Adult male in spring and summer. — Pileum, down to and usually 

 including lores (at least the upper portion*) and upper margin of 



«Four specimens. 



Specimens from different localities average, separately, as follows: 



''A specimen in National Museum collection, without definite locality, collected 

 by Capt. J. M. Dow. 



"The specimen described is probably P. nigriceps; the others enumerated are 

 almost certainly not that form. 



^ Costa Rica also cited. 



«The lores are sometimes wholly uniform black, rarely entirely white, this varia- 

 tion apparently depending neither on season nor age. 



