258 ORNITHOLOGICAL EXPLORATIONS. 



116. Acanthls homemannii ezilipes (CouES). 



I860. — Fringilla (Acanthis) linaria var. caneacena Schrenck, Reise Amarl., I, p. 296. 

 1861.— Cannaiina canescews SwiNH. , Ibis, 1861, p. 335 {necGovi.T>),—JEgiothu8 c. Id., P. 



Z. S., 1863, p. 299. -Acanthia c. Dybow. & Parvex, J. f. Orn., 1868, p. 335.— 



Taczan., J. f. Orn., 1873, p. 92.—Id.,iUd., 1874, p. 336— id.. Bull. Soc. Zool. 



France, 1876, p. 180.— Id., Orn. Fauna Vost. Sibir., p. 40 (1877).— Dybow- 



SKi, Bull. Soc. Zool. France, 1883, p. 366. 

 1861.— j^giothua exilipes CoUES, Pr. Phil. Acad., 1861 (p. 385). 

 1872.— ^giothua linaria var. exilipes CouES, Key, p. 131 (1872). 

 1874. — ^giothua caneacetis exilipes RiDGW., Ann. Lye. Nat. Hist. New York.X, 1874, p. 



372.— Bean, Pr. U. S. Nat. Mus., 1882, p. 149.— Nelson, Cruise Corwin, 



p. 67 (1883). 

 1811.— Mgiothua ?)orea?i8 SwiNH., P. Z. S., 1871, p. 386 (nee Vieill.).— Id., Ibis, 1874, p. 



160. 

 1880.— Xinoto linaria Blakist. «fc Pryer, Trans. As. Soc, VIII, 1880, p. 233.— /id., ibid., 



X, 1882, p. 174. 



The smaller white-rumped Ked Poll is only a winter visitor to Bering 

 Island from more northern regions. They were found in very limited 

 numbers from November to March, flitting hastily from one dry stem of 

 Archangelica, on the seeds of which they mostly feed, to another. 



Though connected with the large Greenland form hornemanii Hole. 

 {canescens auct. nee Gould), which it very closely resembles in coloration 

 by intermediate forms, it is sufficiently distinct to be designated by a 

 separate name. A. hornemanii proper is restricted as a breeding bird 

 to Greenland, from whence it in winter visits the most northern parts of 

 Eastern America. It is by far a larger bird, as the following comparison 

 shows : The wings of the five males from Bering Island average (cfr. 

 the table below) 72'"'", the tails 57.6'^'", and the bills 6.4'"'°, while the 

 average dimensions of six males in winter plumage of the Greenland 

 form, give 85.3 (average of 86, 86, 82, 86, 87, 85) '"'" for the wing, 66.3 

 (66, 64, 66, 69, 67, and 66) """ for the tail, and 8'"'° (the bills in all six 

 being equal) for the bill. This gives a difference of 13.3'"'° in the wing, 

 8 7mm in the tail and 1.6'"'" in the bill, difierences which are quite con- 

 siderable in so small birds. It will be observed, however, from the tables 

 given below, that the American specimens of exilipes are a trifle larger, 

 and even some larger examples from Eastern America might have been 

 added to the list had it not been that I restricted the table to specimens, 

 the locality, date, and sex of which was marked down on the label by 

 the collector. Nevertheless, the difference between the two forms is so 

 great that I have been somewhat doubtful whether they might not be 

 regarded as fairly established species. 

 The present form occurs in the eastern part of Asia, having been found 



