BIRDS OF NORTH AND MIDDLE AMERICA. 



421 



(101.8); wing, 49.5-53 (52.5); tail, 43.6^8 (46.3); exposed culmen, 

 8-9.5 (8.7); tarsus, 14.5-16 (15.4); middle toe, 8-10 (9.1). « 



Young. — Essentially similar to adults, but without yellow on head 

 or chestnut on lesser wing-coverts; whole pileum, together with lesser 

 wing-coverts, uniform grayish brown (hair brown), concolor with 

 back, etc.; malar region, chin, throat, and upper chest very pale 

 brownish gray, the sides of head similar, but slightly darker; mandi- 

 ble pale-colored, at least basally. 



Southern Texas (north to Eefugio and Bexar counties), New Mexico, 

 Arizona, southwestern Utah, southern Nevada (Great Bend of Colo- 

 rado River), and southern California (San Bernardino and San Diego 

 counties), northern Lower California, and Mexican States of Sonora 

 (except southern portion). Chihuahua, Durango, Coahuila, Nuevo Leon, 

 and Tamaulipas. 



Aegithalus flaviceps Sundevall, CEfv. K. Vet.-Akad. Forh. Stockh., vii, 1850, 

 129 ("Sitka or California"). — Heermann, Rep. Pacific R. R. Surv., x, pt. 

 iv, 1859, 43 (Fort Yuma and m. Mojave R., a. e. California). 



MgUlwlus flaviceps Gadow, Cat. Birds Brit. Mus., viii, 1883, 72, part ("Cali- 

 fornia"). 



Psaltria flaviceps Sclater, Proc. Zool. Soc. Lond., 1856, 37 (crit. ); Ann. and 

 Mag. K H., 2d ser., xix, 1857, 92, 93 (do.). 



Paroides flaviceps Baird, Rep. Pacific R. R. Surv., ix, 1858, 400; ed. 1860 (Birds 

 N. Am.), atlas, pi. 53, fig. 2; Rep. U. S. and Mex. Bound. Surv., ii, pt. ii, 

 1859, 14, pi. 15, fig. 2 (El Paso, Texas; Saltillo, Nuevo Leon); Cat. N. Am. 

 Birds, 1859, no. 300; in Rep. Ives' Expl. Col. R., pt. v, 1861, 6 (Fort 

 Yuma). — Butcher, Proc. Ac. Nat. Sci. Phila., 1868, 149 (Laredo, Texas). 



« Fourteen specimens, 

 tively, as follows: 



pecimeus from different geographic areas average, respec- 



Specimens from Arizona, northern Sonora, and southern California are apparently 

 very slightly paler and possibly a little browner than those from the Rio Grande 

 Valley, but 1 am unable to detect any decided difference in coloration. 



