New Birds from, Northwestern Mexico. 31 



much paler, and is, in fact, the palest known subspecies of M. obscunts. 

 The present record extends the range of this species far north along the 

 west coast of Mexico. M. townsendi is the resident species in the high 

 pine forests of the Sierra Madre of northwestern Mexico, the present 

 form belonging to the lower, drier ranges between the Sierra Madre and 

 the coast. 



Catharus olivascens sp. nov. Chihuahua Thrush. 



Type No. 164263, cT ad., U. S. Nat. Mas., Biological Survey Collection, 

 from the Sierra Madre, Chihuahua (65 miles east of Batopilas), Mexico. 

 Collected September 30, 1898, by E. A. Goldman. 



Distribution. Known only from the type locality. 



Description of type. Top of head and nape raw umber brown; sides of 

 head and neck hair brown, underlaid with pale.buffy; back, including 

 scapulars and rump, olive brown, contrasting with color of crown and 

 nape ; outside of wings and upper tail coverts similar to, but browner 

 than back ; tail grayish brown washed on exposed parts with tawny 

 olive ; chin, throat and upper part of breast, pale creamy buff, streaked 

 or mottled with hair brown shaded with olive; rest of breast, abdomen, 

 and under tail coverts white ; upper part of flanks pale grayish brown. 



Measurements of type. Wing 91 ; tail 77 ; culmen 13 ; tarsus 31. 



General notes.. This species is most closely related to Calharus occiden- 

 inlis fnh-escens Nelson, but the colors of the upper parts are much more 

 olivaceous, the throat and middle of breast deeper bufty with heavier 

 gray markings, and the wash of gray on the sides of the body much 

 more restricted, leaving a larger area of pure white. The bill is longer 

 and slenderer and the tarsus shorter. The presence of a species of 

 CatJiarus in Chihuahua extends the range of the genus far north of any 

 former record, and was unexpected after my unsuccessful efforts, during 

 the summer of 1898, to find the bird in Durango and extreme southern 

 Chihuahua. 



