14 TURDIDA. 
The usual winter quarters of the true 7. pallast do not apparently extend beyond 
Florida, as there are no authentic records of its presence in the West-Indian islands, 
nor even in the valley of the Rio Grande. Our Guatemalan specimen therefore should, 
’ we think, be looked upon as a straggler which has flown far beyond the ordinary limits 
of the winter quarters of the species. A very full account of 7. pallasi and its allied 
races is given in Dr. Coues’s recently published ‘ Birds of the Colorado Valley ’ °. 
7. Turdus auduboni. 
Merula silens, Sw. Phil. Mag. new ser. i. p. 869° (nec Vieill.). 
Turdus silens, Scl. P. Z.S. 1858, p. 800°. 
Turdus solitarius, Scl. P. Z.S. 1857, p. 212°. 
Turdus auduboni, Baird, Rev. Am. B. p. 16*; Sumichrast, Mem. Bost. Soc. N. H. i. p. 542°; 
Henshaw, Bull. Nutt. Orn. Club, iv. p. 134°. 
Turdus pallasi, var. auduboni, Baird, Brew. & Ridgw. N. Am. B. 1. p. 21 - 
Turdus (Hylocichla) pallasi, c. auduboni, Coues, B. Col. Vall. i. p. 21°. 
Similis 7’. pallasi, sed colore corporis supra cinerascentiore et minus cinnamomeo, cauda brunnescentiore ; 
statura quoque crassitiore distinguendus. Long. tota 7:0, ale 4:0, caudg 3:1, rostri a rictu ‘8, tarsi 1-2. 
(Descr. fem. ex Oaxaca, Mexico. Mus. nostr.) 
Hab. N. America, Southern Rocky-Mountain region ® 7 §.—Mexico, Temascaltepec 
(Bullock 1), La Parada (Boucard *), Orizaba (Botteri®, Sumichrast°); GUATEMALA, 
Pine-forest of Volcan de Fuego, alt. 10,000 to 12,000 ft. (O. S.). 
In his paper on Bullock’s collection of Mexican birds Swainson gave the characters of 
this Thrush 1, but unfortunately chose for it the name of Twrdus stlens, one that had 
previously been employed by Vieillot. He also erroneously referred to pl. 43. fig. 2 
of Wilson’s ‘ American Ornithology’ (vol. v.) as representing his bird, this figure, in fact, 
being a portrait of 7. swainsoni. Swainson’s name, however, remained in common use 
until 1864, when Prof. Baird showed the impropriety of its retention, and substituted 
that of 7. auduboni, basing his name upon a specimen from Fort Bridger *. 
The relationship subsisting between the three forms of Red-tailed Thrushes 7. pallasi, 
T. auduboni, and T. nanus had long been a matter of discussion amongst ornithologists 
of the United States; and the matter still seems to be sub judice. In Dr. Coues’s 
‘Birds of the Colorado Valley,’ and in Baird, Brewer, and Ridgway’s ‘ North American 
Birds,’ the small western form 7. nanus and the large Colorado and Mexican form 
T. auduboni are treated as imperfectly segregated races of the eastern 7. pallast; but 
Mr. W. H. Henshaw, in a recent paper ®, seems inclined to the view that segregation has 
proceeded far enough to admit of each race being recognized with certainty. As our 
American brethren, with far more ample materials from which to form a judgment, seem 
to be not yet of accord on this subject, it would be presumptuous of us to pronounce a 
decided opinion; but as 7’. nanus seems to be absent from our limits, and as the true 
T. pallasit has only occurred once within them, 7’. auduboni is left practically the sole 
