20 Thayer and Bangs Breeding Birds of North Central Sonora. 



Thryomanes bewickii eremophilus Oberh. 

 La Chumata. 



Catherpes mexicanus polioptilus Oberh. 

 La Chumata 



Sitta carolinensis nelsoni Mearns. 

 La Chumata. 



Baeolophus wollweberi annexus (Cass.). 



La Chumata. 



Auriparus flaviceps flaviceps (Sund.). 

 Opodepe. 



Psaltriparus plumbeus cecaumenorum subsp. nov. . 



La Chumata, eight adults of both sexes. 



Type from La Chumata mine, north central Sonora, 4,500 feet altitude, 

 adult d No. 14,724, collection of E. A. and O. Bangs. Collected May 22, 

 1905, by W. W. Brown, Jr. 



Characters. Slightly smaller than true P. plumbeus Baird of Arizona ; 

 upperparts blue-gray (olive-gray in true P. plumbeus} ; whole head and 

 underparts much paler. 



Remarks. This is a well marked southern form of P. plumbeus. Mr. 

 Oberholser kindly compared our eight skins with the large series at Wash 

 ington, and agrees with us as to its distinctness. 



MEASUREMENTS. 



Aphelocoma sieberii arizonae (Ridg.). 



La Chumata. 



Lanius ludovicianus excubitorides (Swains.). 

 Opodepe. 



La Chumata. 



Opodepe. 



Opodepe. 



Vireo button! Stephens! Brewster. 



Vireo belli! ari/.ona? Ridg. 

 Phainopepla nitens (Swains.). 



