rONTRIBUTIONS TO TH K OltXIS OF SAniTALIX. 31 



(June 11), wliieli I take to be the oldest, lias the throat uni- 

 formly sooty brown, not quite so dark as in the males, partly 

 with whitish but inconspicuous base to the feathers ; axillaries 

 and under-wing-coverts gray scarcely with a rusty tint. The 

 two next specimens (June 29, July 14) have the white of the 

 throat more conspicuous and so also the rusty colour under the 

 wing. The two remaining specimens have white throats streaked 

 with brown and the under-wing-coverts more suffused with rusty. 



I think that these series present a sufficient number of 

 intergrading links between T.jouyi as characterized by Stejneger 

 (1887) and T. chrysolaiis ; and since they were collected in the 

 same locality and in the same season of the year, it may be 

 concluded that they belong all to the anme race. 



A young bird has been described by Nikolski (in Tacza- 

 NOWSKi's translation'^) in the following words : " Les jeunes 

 oiseaux de cette grive, jugeant d'après notre exemplaire, présentent 

 la coloration suivante: Dos gris oblivâtre, à nuance générale 

 semblable à celle des oiseaux adultes, mais avec des taches ocreuses 

 centrales dans les plumes, et l'extrémité de ces plumes noire ; sur 

 le croupion ces taches et ces bordures disparaissent presque ; la 

 poitrine, les flancs et le front sont d'un orange un peu plus vif 

 et plus pure que dans les adultes, ces plume orangées ont des 

 taches noires denses, subarrondies sur la poitrine, transversalement 

 I^rolongées sur les côtés ; sur la gorge l'orange passe en Stramine 

 pâle." This description suits very well for a young male collected 

 on July 29 and with the quills not yet fully developed. I may 

 only add that the axillaries and under-wing-coverts, as far as are 

 developed, are strongly rusty yellow. From this it may be con- 



1) Faune Ornitliol. de la Sibérie Orientnle. Mém. de I'Acad. Imp. des Sciences de St. 

 Petersbourg, VII. Ser., T. XXXIX, p. 314. 



