Thayer and Bangs — Breeding Birds of North Central Sonora. 19 



Melanerpes formicivorus melanopogon (Teinm.). 



La Chunmta. The twenty-three skins taken represent a race not quite 

 typical of any of the named forms. The bill is smaller than in Californian 

 specimens, and the breast rather more streaked. The band on the crown 

 is nearl)' as narrow as in august if rons. 



Melanerpes uropygialis (Baird). 

 Opodepe. 



Dendrocopus arizonas (Hargitt). 

 La Ciiumata. 



Pyrocephalus rubineus mexicanus Sclater. 

 Opodepe. 



Empidonax difficilis Baird. 

 La Chumata. 



Horizopus richardsoni (Swains.). 



La Cliumata. 



Myiarchus mexicanus magister Ridg. 

 La Chumata. 



Myiarchus cinerascens cinerascens (Lawr.). 

 La Chumata ; ()|)ode|)e. 



Myiarchus lawrencei olivascens Ridg. 

 La Chumata. 



Tyrannus verticalis Say. 



Opodepe. 



Tyrannus vociferans Swains. 

 Opodepe ; La Chumata. 



Mimus polyglottos leucopterus (Vig.). 



Opodepe. 



Toxostoma curvirostre palmeri (Ridg.). 



Opodepe. Nelson has separated the bird of southern Sonora, type locality 

 Alamos, as T. c. macul'itv.^ (Auk, vol. XVII, 1900, p. 269). We can not 

 detect any differences in the birds taken by Brown from Guaymas north 

 to Opodej)e, and Arizona specimens, and believe they should all go with 

 the northern form. 



Sialia sialis azurea (Baird). 



La Chumata. 



Polioptila caerulea obscura Ridg. 

 La Chumata. 



Polioptila plumbea (Baird). 

 Opodepe. 



Heleodytes brunneicapillus brunneicapillus (Lafr.). 

 Opodepe. 



