THE BIRD BOOK 



374— 375a 



37Sf. Mexican Screech Owl. Otus asio cineraceus. 

 Range. — Western Mexico and southwestern border of 

 the United States. A gray form with little or no buff, and 

 more numerously barred below. 



373g. Aiken's Screech Owl. Otus asio aikeni. 



Range. — El Paso County, Colorado. A gray form, with 

 the dark markings coarser and more numerous than in any 

 other. 



37Sh. MacFarlane's Screech Owl. 

 Otus asio macfarlanei. 

 Range. — Northern border of the United States from 

 Washington to Montana. 



373.1. Spotted Screech Owl. Otus trichopsis. 



Range. — Mountains of southern Arizona, south into 

 Mexico. 



A grayish species, similar to asio, but paler and more 

 finely barred beneath, and with whitish spots on the 

 feathers of the foreback. The nesting habits and eggs are 

 probably the same as those of the Screech Owl. 



373.2. Xantus's Screech Owl. Otus xantusi. 



Range. — Southern Lower California. 



A grayish species with the back and underparts finely vermiculated with red- 

 dish brown, and with streaks of darker. It is not likely that the habits or eggs 

 of this species will be found to differ from those of the Screech Owl. 



374. Flammulated Screech Owl. Otus flammeolus flammeolus . 



Range. — Mountain ranges of Mexico, north to Colorado and west to California. 



This species is smaller than asio, has shorter ear tufts, the plumage is much 

 streaked and edged with rusty, and the toes are unfeathered to their base. They 

 nest in hollow trees, generally using deserted Woodpecker holes. Their three 

 or four eggs are white. Size 1.15 x .95. This species is uncommon in all parts 

 of its range. 



374a. Dwarf Screech Owl. Otus flammeolus idahcensis. 



Range. — Local in Idaho, eastern Washington and California. 



This rare variety is smaller than the preceding and is considerably paler. Its 

 eggs have not been described, but should be a trifle smaller than the last. 



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