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. 'Of^ ^ During some months last spring and summer spent in traveling about in Sonora to establish the present range of the vanishing Colinus rlrlgicayi, Mr. W. W. Brown, Ji\, 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 le.ss 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 caiion flows a brook which in the rainy season becomes quite a river, and along its banks the vegetation is luxuriant, cottonwood, birch, willow and oak being the charac-teristic trees. The peaks al)ove are rather more barren, three species of oaks being the characteristic trees, with long grass growing under them. The commoner bi'xls of the caiion were 4— Proc. Biol. Soc. Wash., Vol. XIX, 1906. (17)
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