naumann's thrush. 209 



difficult witli a young bird in autumn, even when fresh. 

 Many birds of this age have rusty yellow spots on the 

 feathers of the back and middle wing, but only shew 

 them when the feathers are shed; also the tail feathers 

 are strongly rust yellow at their bases, and have light 

 red-coloured shafts." 



Now both the last two birds may from these descrip- 

 tions be easily confounded with the young of T. fuscatus, 

 and no doubt they have been, so frequently as to lead 

 to the species being considered identical. 



Naumann himself much regrets that the old male 

 which he first describes, and which answers in every 

 point to the fi-gure I have given from Mr. Gould's 

 Chinese skin, did not reach him soon enough to be 

 figured. He takes great pains, however, to describe it, 

 and I hope that the long extract I have given from 

 his work, and the two figures, one of the adult and the 

 other young of the year. No. 2 in Naumann's Plate 

 LXVIII, the last of the three described, will be sufficient 

 to enable ornithologists to distinguish this bird in 

 future. 



The principal points of difference between T. nau- 

 manni and T. fuscatus, as laid down by Dr. Schrenck, 

 are a much clearer brownish olive grey on the upper 

 plumage in the former, by the rusty-coloured shaft spots 

 on each feather, the blackish and rusty brown spots 

 on the crop and breast, the rusty arrow-shaped spots 

 on the flanks and sides of the breast, the smaller rusty 

 brown borders on the greater wing coverts and under 

 primaries, and the broad rusty on the outer tail feathers. 

 It must be borne in mind, however, that Dr. Schrenck 

 only got one specimen, and that resembles the first 

 figure in Naumann's plate, and the second in the des- 

 cription I have quoted. His specimen is in spring 



