BIRDS OP^ NORTH AND MIDDLE AMERICA. 



421 



(101.8); wing, 49.5-53 (52.5); tail, 43.5-48 (46.3); exposed culnicii, 

 8-i).5 (8.7); tarsus, 14..5-16 (15.4); middle toe, S-10 (9.1). « 



Youmj. — Essentiall}' similar to adults, but without ^^ellow on head 

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

 wing-coverts, uniform grayish ])rown (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 Refugio and Bexar counties), New Mexico, 

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

 rado River), and southern California (San Bernardino and San Di(>go 

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

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

 and Tamaidipas. 



Aeglthulnit Jiaclceps Sundevall, CEix. K. Yet.-Akad. F(")rli. Stockh., vii, 1S50, 

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

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



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

 fornia " ) . 



Pnaltria flaiicep.'i Sclater, Proc. Zool. Soc. Lond., 185(), 87 (crit. ); Ann. and 

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



J'nroides 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). 



<i Fourteen specimens. Specimens from different geographic areas average, respec- 

 tively, as follows: 



Locality. 



MALES. 



Ten luliilt iiuik's from Rio Gniiido Valley 



Ten adult males from Arizona 



Three adult males from southern California 



Ten adult males (of ^1. /. lamprocephalus) from Cape St. 



Lucas 



Three adult males (of .1.,/". himproccphalus) irom sotitheru 



Sonora 



One adult male from Durango (Ciudad Durango) 



One Hd\ilt male from Coahuihi (Monelova) 



FEMALES. 



Seven adult females from Rio C.rande Valley 



Seven adult females from Arizona and northern Sonora.. 



Six adult iQmix\es (of A. f. lamproccplial us) from Cape St. 



Lucas 



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

 very slightly j)aier and possilily a little hrownor than those fmin the Rio Grande 

 Yalley, but I am luiable to detect anv decided difference in coloration. 



