62 



REVIEW OF AMERICAN BIRDS. 



[part I. 



SIALIA, SwAiNSON. 

 Sialia, SwAiNSON, Zool. Jour. Ill, Sept. 1827, 173. (Type Motacilla sialis, Linn.) 



Sialia sialis. 



Motacilla sialis, Linn. S. N. 1758, 187 (based on Catesby, I, pL 47).— 



Sialia sialis, Baird, Birds N. Am. 1858, 222.— Boaedman, Pr. Bost. 



Soo. 1862, 124 (Calais, Me. ; very rare). 

 Sialia wilsonii, Swainson, Zool. Jour. Ill, 1827, 173.— Cab. Jour. 1858, 



120.— GcNDLACH, Cab. Jour. 1861, 824.— Jones, Nat. Bermuda, 



1859, 28, 66 (resident in Bermuda). 

 Sylvia sialis. Lath. ; Ampelis sialis, Nutt. ; Erythraca wilsonii, Sw. 

 Figures : Vieillot, Ois. Am. Sept. II, pi. ci, cii, ciii.— Wils. I, pi. jii 



— AuD. Orn. Biog. II, pi. oxiii.— Ib. B. A. II, pi. 134.— Doughty, 

 Cab. I, pi. xii. 

 Bab. Eastern United States ; resident in Bermuda ; Cuba (rare), Gundlach. 



As far as the indications of the large number of specimens in the 

 Smithsonian Museum extend, this species is confined to the eastern 

 %unal region of the United States and the Provinces, not extending 

 up the western tributaries of the Missouri into the region of the sterile 

 plains, nor northward beyond Lake Winnipeg. It is a rare bird in 

 the West Indies — Gundlach recording it as scarce in Cuba. It is 

 resident in Bermuda, whence the eggs have been received by the 

 Institution. 



From the fact of the rarity of this species as a winter migrant in 

 the West Indies, and its not occurring at all on the western plains, 

 I am inclined to believe that the difference in shade of color shows 

 the Mexican and the Guatemalan species to be distinct from the 

 North American, and entitle it to a specific appellation. 



Sialia azurea. 



Sialia azurea, Swainson, Phil. Mag. I, 1827, 369. 



Sialia wilsonii, Solatbk, P. Z. S. 1856, 293 (Cordova).- Ib. 1858, 299 

 (Oaxaca — high lands). — Ib. 1859, 362 (Xalapa). — Sclater, Ibis, 



1859, 8 (Guatemala).— Ib. Catal. 1861, 11, no. 65.— Taylor, Ibis, 



1860, 110 (Honduras).— Owen, Ibis, 1861, 60 (Guatemala), nest. 

 Hab. Eastern Mexico and Guatemala. 



