VOL. XIX PP. 17-22 FEBRUARY 26, 1906 



PROCEEDINGS. 



OF THE 



BIOLOGICAL SOCIETY OF WASHINGTON 



BREEDING BIRDS OF THE SIERRA DE ANTONEZ, 

 NORTH CENTRAL SONORA. 



BY JOHN E. THAYER AND OUTRAM BANGS. 



During some months last spring and summer spent in traveling 

 about in Sonora to establish the present range of the vanishing 

 Colinus ridgwayi, Mr. W. W. Brown, Jr., made small collections 

 of birds at several different points. Most of the places visited 

 are pretty well known, and nothing. of special interest was taken. 

 One region, however, where Mr. Brown remained through the 

 height of the breeding season, is less well known, and a nominal 

 list of the birds taken there is perhaps worth publishing. 



This place is a range of low mountains known as the Sierra 

 de Antonez, in north central Sonora, about latitude 30, longi 

 tude 110+ and 95 miles south of the Arizona boundary, but 

 extending almost to the boundary in a series of lower foot-hills. 

 These mountains make a slight watershed, the Rio de Sonora 

 and San Miguel rising there and flowing south, then west, and 

 branches of the Gila River rising in their northern end and flow 

 ing north. 



Mr. Brown collected here from the last few days of April to 

 the first of June, principally at Opodepe, 2,000 feet altitude, 

 and La Chumata mine, 4,500 feet altitude; the two places about 

 20 miles apart east and west. La Chumata mine is situated on 

 the south side of La Chumata canon, 275 feet above its bottom. 

 Through the canon flows a brook which in the rainy season 

 becomes quite a river, and along its banks the vegetation is 

 luxuriant, cotton wood, birch, willow and oak being the charac 

 teristic trees. The peaks above are rather more barren, three 

 species of oaks being the characteristic trees, with long grass 

 growing under them. The commoner birds of the canon were 



4 PROC. BIOL. Soc. WASH., VOL. XIX, 1906. (17) 



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