198 VERTEBRATES: BIRDS. 



The Mountain Titmouse, P. montanus, Gambel, of West- 

 ern North America, is five inches long, the wing two and 

 six tenths inches ; the head and neck above, a line through 

 the eye, and the under part of the head and the throat, 

 glossy black ; the forehead and a line over the eye, and 

 one below it, white ; the other parts ashy. 



The Chestnut-backed Tit, P. rufescens, Towns., of West- 

 ern North America, is four and three quarters inches 

 long, the wing, less than two and a half inches, and is 

 readily distinguished by the dark brownish-chestnut of 

 the back and sides. 



The Hudsonian Titmouse, P. hudsonicus, Forster, of 

 Northeastern North America, is five inches long, the 

 wing two and four tenths inches ; the color yellowish 

 olive-brown, under parts white. 



The Genus Psaltriparus has the bill very small and 

 short, the outline much curved for its terminal half, 

 the tail long and slender and much graduated, tarsi 

 longer than the middle toe, and no black on the crown 

 or throat. 



The Black-cheeked Tit, P. melanotus, Bonap., of the 

 Rio Grande region, is four inches long, the wing one inch 

 and nine tenths, and is distinguished by a black patch on 

 each cheek. 



The Least Tit, P. minimus, Bonap., of the Pacific coast 

 of the United States, is of the same size as the preceding ; 

 the color olivaceous cinereous. 



The Lead-colored Tit, P. plumbeus, Baird, of the South- 

 ern Rocky Mountains, is four and one fifth inches long, 

 the wing less than two and a quarter inches. 



The Genus Paroides comprises the Verdin, P.flaviceps, 

 Baird, of Texas, which is four and a half inches long, the 

 wing less than two and a quarter inches; and distin- 

 guished from all the foregoing in the greater length of 

 the quills ; the color above cinereous, head yellow, under 

 parts brownish white. 



