24 CHECK LIST OF NOBTH AMERICAN BIRDS. 



7. Tardus fuscescens Steph. b isi. c 6. r 2. 



Wilson's Thrush. 



8. Turdns unalascae Gm. b 150. c 46. R 5. 



Western Hermit Thrush. 



9. Turdus unalascse auduboni (Bel.) Coues. b UQvar. c 4a. R 5a. 



Audubon's Hermit Thrush. 



10. Turdus unalascse nanus (Aud.) Coues. b 149. c 4. R 56. 



Eastern Hermit Thrush. 



11. Turdus ustulatus Nutt. b 152. c 56. R 4. 



Oregon Olive-backed Thrush. 



12. Turdus ustulatus aliciae (Bd.) Coues. b 154. c 5a. R3. 



Gray-cheeked Thrush. 



13. Turdus ustulatus swainsoni (Cab.) Coues. b 153. c 5. R 4a. 



Olive-backed Thrush. 



7. T. fus-ces'-cens [foosaysayncej. Present participle of a supposed Lat. inceptive verb 



fuscesco, I grow dark or swarthy; Lat. yi/sco, of same signification. It means, or should 

 mean, less than yi/scus ,• i.e., somewhat dark ; is not otherwise applicable to the lightest- 

 colored thrush of this group. 



8. T. u-na-las'-cae. Of the Island of Unalaska. It is permissible, indeed desirable, to resolve 



Gmelin's barbarous word aonulaschkae into a purer form. With this orthography the 

 word is of sufficiently classical aspect, and corresponds with alascensis. See Anorthura, 

 No. 78, and Passerella, No. 283. 



This is T. pallasi var. nanus of the orig. ed. of the Check List. For the change, see 

 Pr. Nat. Mus., 11, 1880, p. 1. 



9. T. u. aud'-ii-bon-i. To John James Audubon, the "American Backwoodsman," and 



famous author of the " Birds of America." 



This is T. pallasi var. auduboni of the orig. ed. of the Check List. 



10. T. u. na'-nus. Lat. nanus, from the Gr. vdwos or vivos, a dwarf. 



This is T. pallasi of the orig. ed. It is true that nanus has of late been applied exclu- 

 sively to the Western form, the true unalasctB Gm. But the name nanus was originally 

 based by Audubon on a bird from Pennsylvania, and only later amplified by him to 

 include the Western form. The long survival of an error does not justify its continued 

 perpetuation after detection. 



11. T, us-tu-la'-tQs. Lat. ustulatus, perfect participle of vstulo,! scorch, singe; with reference 



to the ashy coloration, as if the bird had been charred. 



This stands as T. swainsoni var. ustulatus in the orig. ed. The case is precisely 

 parallel with that of nanus vs. pallasi ; for Nuttall named the Oregon bird ustulatus in 

 1840, and Cabanis did not apply the name swainsoni to the Eastern Olive-backed Thrusli 

 till several years afterward. 



12. T. u. a-ir-ci-ae. To Miss Alice Kennicott, sister of Kobert Kennicott, of Illinois. See 



Scops, No. 466. 



This is T. swainsoni var. alicim of the orig. ed. See No. 11. 



13. T. u. swain'-s6n-i. To William Swainson, the zealous and accomplished English natu- 



ralist. 



This is T. swainsoni of the orig. ed. See No. 11. 



