^°8qS^^] OniciuioLSKU, A Ncxv North American TItnisk. iQcr 



YouuiT in first filumagc, sex unknown, No. 136318, U. S. Nat. Miis., 

 Biological Survey Collection ; Thomp.son Falls, Montana, Aug. 1,1895; 

 V. Bailey. Above greenish olive, most of the feathers, except on the 

 lower back and rump, with shaft markings of buffy, these smallest on 

 the head ; upper tail-coverts broadly tipped with ochraceous ; tail and 

 wings fuscous, with edgings of greenish olive, the median coverts with 

 shaft spots of buffy; sides of head buffy mixed with brownish; throat 

 and jugulum pale buff, heavily marked with blackish ; rest of lower sur- 

 face dull white, with transverse markings of dark brown, these larger 

 and darker anteriorly, the sides and flanks washed with brownish. 



The present race differs from the eastern Hylocichla ustulata 

 swahisoiiii in the more grayish, less olivaceous color of the upper 

 surface, this being usually most noticeable on the rump and upper 

 tail-coverts. The sides and flanks also average more grayish. 

 No apparent difference in size exists. No comparison with H. 

 iistulata proper is necessary, for Hylocichla tt. almoe, although 

 geographically intermediate, is even less closely allied to ustulata 

 than is swainsonii. 



Olive-backed Thrushes from western British America and the 

 interior of Alaska, while not perfectly typical, are nearer swain- 

 sojiii than to alma;. Montana, Colorado and Texas have both 

 forms during migration, as the specimens at hand attest. Two 

 examples collected by Mr. E. W. Nelson on the Tres Marias 

 Islands, western Mexico, are typical almce\ but this form has not 

 been traced farther south than the Isthmus of Tehuantepec, unless 

 an intermediate specimen from Costa Rica be considered suffi- 

 cient evidence. Two birds from Vincennes, Indiana, with one 

 other from Wheatland, in the same State, apparently must be 

 referred to ahncB, for they are absolutely indistinguishable from 

 western examples. 



Young birds of H. u. alincB appear to be usually more greenish 

 olive than those of swaijisofiii, though this is not diagnostic. 



Alma's Thrush is a common bird in eastern Nevada, where it 

 inhabits the growth of trees and bushes that fringes the mountain 

 streams. In the Monitor and East Humboldt Mountains, it is 

 apparently the most numerous species of the family. 



The following list of localities from which specimens have been 

 examined will give a fair idea of its range, breeding birds being 

 indicated by an asterisk : 



