434 PROCEEDINGS OF THE NATIONAL MUSEUM. 



ocliraceous, Leavily barred with black; lining of wing grayish white. 



Young in first plumage. — Female; jSTo. 142967, U.S.N.M., Biological 

 Survey collection ; Oaxaca, Oaxaca, Mexico, June 22, 1894; Nelson and 

 Goldmau. Above slightly rufescent hair brown, rather darker and 

 more reddish on rump, some of the feathers of the latter with hidden 

 whitish spots. Exposed surface of closed wings like the back, the 

 greater coverts and secondaries obsoletely barred with darker. Cen- 

 tral rectrices and exterior webs of all the remaining ones except the 

 outer pair, like the back, regularly barred with black; rest of tail black, 

 the feathers tipped with hair brown; two outermost pairs barred dis- 

 tally with white on external webs. Superciliary stripe dull white; 

 lores and cheeks grayish white, mixed with brownish; below brownish 

 white, most nearly clear white on chin and throat, mottled with dull 

 gray on jugulum and breast, heavily washed with brownish gray on 

 sides and flunks, this most rufescent on the latter; crissum washed with 

 ochraci'ous and barred heavily with black. 



The name Thryothorus hairdi was proposed by Messrs. Salvin and 

 Godman as a substitute for the untenable ThryothoruH hcicickli var. 

 leucogasier of Baird; but the term bairdi, as at present understood, 

 includes several recognizable forms, in differentiating which it becomes 

 necessary to employ for one of these the designation hairdi. 



True hairdi, then, as here restricted, may be distinguished from 

 murinns by somewhat smaller size, particularly the bill; paler, more 

 brownish or more ochraceous upper parts, and rather less heavily 

 barred crissum. From percmis, of western Mexico, it may be separated 

 by paler, more grayish brown upper parts, rather less heavily barred 

 crissum, shorter wing and culmen. It differs appreciably from cryptus 

 in darker, grayer color above, and has also a rather wider superciliary 

 stripe. It may be differentiated from eremophUns by somewhat darker 

 upper surface, broader superciliary, and rather darker flanks. It has 

 a decidedly longer wing and tail than ckarientiirns, besides being 

 noticeably lighter on the upper parts, flanks, and sides. With drymoe- 

 cus, from California, it can scarcely be confused, by reason of its much 

 longer wing and tail, less rufescent ui)per surface, as well as paler 

 flanks and sides. 



With due allowance for individual and seasonal variation, the speci- 

 mens which are here referred to hairdi present but slight aberrant 

 characters. An April bird from Chalchicomula, Puebla, Mexico, is 

 rather darker than the example from Oaxaca, above described, thus 

 inclining toward murinus, but it belongs without doubt to the present 

 subspecies. 



Nine specimens have been examined, representing the following local- 

 ities, breeding records being designated by an asterisk: 



Oaxaca: Oaxaca;* Tamazulapam. 



Puebla: Chalchicomula;* Tehuacan;* Atlixco. * 



Vera Cruz: Maltrata; Perote.* 



