New Birds from Northwestern Mexico. '2 ( .) 



Distribution. Coast lowlands of western Mexico from Mazatlan at least 

 to southern border of the Territory of Tepic. 



Subspecific characters. Similar to Arremonops superciliosa sumichrasti, hut 

 the median line of crown and sides of head more ashy ; forehack dis 

 tinctly shaded with ashy and rest of back clearer and less olive green ; 

 under parts paler and less buffy. Median and superciliary crown streaks 

 darker ashy than in typical superciliosa, the rufous lateral stripes paler; 

 chin and throat much paler and less buffy about as in sumichrasti ; 

 back a little grayer. 



Dimensions of type. Wing 65 ; tail 56 ; culmen 13; tarsus 20.5. 



General notes. By a slip of the pen in the 'Ank' for April, 1898, p. 157, 

 I placed A. sumichrasti as a subspecies of rufivirgata. In fact it is a sub 

 species of the quite distinct A. superciliosa, which (with all its subspecies) 

 belongs to the west coast of Central America and Mexico. A. rufivirgata 

 and its subspecies belong to the east coast. 



Basileuterus rufifrons caudatus subsp. nov. Sonora Warbler. 



Type No. 164260, $ ad., U. S. Nat. Mus., Biological Survey Collection, 

 from vicinity of Alamos, Sonora, Mexico. Collected January 3, 1899, by 

 E. A. Goldman. 



Distribution. Southwestern- Sonora and northern Sinaloa, Mexico. 



Subspecific characters. Similar to Basileuterus rufifro)>sjouyi from which 

 it differs in the paler and more restricted rufous area on crown ; rather 

 paler gray of back ; more fulvous color on crissum combined with shorter 

 wing and longer tail and tarsus. 



Dimensions of type. \Ving 51 ; tail 60; culmen 10 ; tarsus 23. Type of 

 B. r. jouyi. Wing 52 ; tail 56 ; culmen 9 ; tarsus 20. 



Thryothoius felix pallidus subsp. nov. Mazatlan Wren. 



Type No. 164270, $ ad., U. S. Nat. Mus., Biological Survey Collection, 

 from Chacala, Durango, Mexico. Collected February 27, 1899, by E. A. 

 Goldman. 



Distribution. Arid tropical region of western Mexico, from northern 

 Sinaloa and western Durango to southwestern Puebla and northern 

 Guerrero, Mexico. 



Subspecific characters. Generally similar to typical T. felix, but slightly 

 smaller, with upper parts less rufous and more olive brown; tail paler 

 brown, with much more distinct black bars ; under parts paler, and under 

 tail coverts barred witli dingy whitish and black instead of rufous brown 

 and black. 



Dimensions of ti/pe. Wing 56 ; tail 53; culmen 14; tarsus 21. 



General notes. Tliryothorus felix w,as described from southwestern 

 Oaxaca. We have a winter specimen taken at Ometepec, Guerrero, so near 

 the type locality both in distance and climatic conditions that I am safe 

 in considering it typical, and have used it as such in the foregoing com 

 parison. Numerous specimens from Tepic, Sinaloa, and western Durango 

 agree with the type of Thryothorux f. pallidux. 



