BIRDS OF NORTH AND MIDDLE AMERICA. 657 



CATHERPES MEXICANUS ALBIFRONS (Giraud). 

 GIRATJD'S CANTON WREN. 



Similar in size to C. m. mexicanus (the bill averaging even longer), 

 but coloration much paler, the general color of upper parts more 

 grayish brown, chestnut of abdomen, etc., paler, and black bars on 

 tail averaging narrower. 



Adult mfflZe.— Length (skins), 130-149 (141.2); wing, 62-65 (63.5); 

 tail, 52-56 (53.7); exposed culmen, 24.6-26 (25.6); tarsus, 19-20 (19.6); 

 middle toe, 14-15 (14.4). « 



Adult female.— \i&^g'Ca. (skins), 124-142 (132); wing, 58-64 (60.6); 

 tail, 49-56 (61.3); exposed culmen, 20-24 (21.7); tarsus, 18-19 (18.5); 

 middle toe, 13-14(13.5).* 



Northeastern and north-central portion of Mexican plateau, in States 

 of Nuevo Leon (Monterey; Santa Catarina; Sierre Madre), Coahuila 

 (Patos), San Luis Potosi," eastern Zacatecas,'' and Aguas Calientes 

 (Aguas Calientes), and southwestern Texas near mouth of Pecos River 

 (Langtry); probably also eastern Chihuahua. 



Cdtherpes mexicanus (not Thryothorus mexicanus Swamson) Baihd, Rep. Pacific 

 R. R. Surv., ix, 1858, 356, part (Patos, Coahuila; Nuevo Leon); Rep. U. S. 

 and Mex. Bound. Surv., ii, pt. 2, 1859, 13 (Coahuila; Nuevo Leon; habits; 

 song); Review Am. Birds, 1864, 111, part (Nuevo Leon).— Salvin and 

 GoDMAN, Biol. Centr.-Am., Aves, i, 1880, 72, part (in synonymy). — Sharpe, 

 Cat. Birds Brit. Mus., vi, 1881, 280, part (in synonymy). — American Orni- 

 thologists' Union, Check List, 1886, no. 717, part. 



[Catherpes'] mexicanus CouES, Key N. Am. Birds, 1872, 86, part. — Sclater and 

 Salvin, Nom. Av. Neotr., 1873, 6, part. 



C[aiherpes'] mexicanus Ridgway, Man. N. Am. Birds, 1887, 549, part. 



[Caiherpes mexicanus'] var. mexicanus Baird, Brewer, and Ridgway, Hist. N. 

 Am. Birds, i, 1874, 138, part. 



Certhia albifrons Giravd, Sixteen Species Texan Birds, 1841, pi. 13 ("Texas;" 

 type now in coll. U. S. Nat. Mus.).'' 



Troglodytes albifrons Baird, in Stansbury's Rep. Gt. Salt Lake, 1852, 327 

 ("Texas"). 



Caiherpes mexicanus albifrons Nelson, Auk, xv, April, 1898, 160 (crit.; "Lower 

 Rio Grande, in Texas;" "Tamaulipas;" Nuevo Leon; "Isthmus of Te- 

 huantepec"«). — American Ornithologists' Union Committee, Auk, xvi, 



«Four specimens. 



6 Five specimens. 



cNo specimens seen from the States mentioned, which, however, are necessarily 

 included within the range of the former. 



a! The type is a young bird with bill broken off. I have not been able to match it 

 exactly, but it seems to be referable to the present form, as Mr. Oberholser has 

 already stated. 



« I do not know Mr. Nelson's reasons for including the lower Rio Grande Valley, 

 Tamauiipas, and the Isthmus of Tehuantepec in the range of this form. It certainly 

 does not occur in the last-named locality, where only typical C. mexicanus is found. 

 The only specimens I have seen are from Langtry, southwestern Texas, near the 

 mouth of the Pecos River, and from the States of Nuevo Leon, Coahuila, and Aguas 

 Calientes, in northeastern and north-central Mexico. Mr. Nelson's remarks would 

 imply that these birds are migratory; on the contrary, they remain the year round 

 even in the extreme northern parts of the range of the genus, in Nevada, Utah, and 

 Colorado. 



10384— VOL 3—03 42 



