298 



REVIEW OF AMERICAN BIRDS. 



[part I. 



Ool. I, 1857, 100, pi. iv, fig. 47 (eggs). — Lembeye, Aves de Cuba, 

 1850, 46, lam. vii, fig. 2,— Baird, Birds N. Am. 1858, 310.— Lord, 

 Pr. R. A. lust. Woolwich, IV 1864,15 (Br. Columbia; nestiug). — 

 Jones, Bermudas, 34 (Sept. 22, 1849).— Cooper & Suckley, P. R. 

 R. Rep. XII, 11, IS'i.—Petrockelidon bicolor, Sclater, P. Z. S. 1857, 

 201.— Ib. 1859, 364 (Xalapa).— Ib. Catal. 1861, 40.— Sclater & 

 Salvin, Ibis, 1859, 13 (Guatemala). — Tachycineta bicolor, Cab. 

 Mus. Heiu. 1850, 48 ; Jour. Oru. 1S56, 4 (Cuba).— Gu.ndlacu, Jour. 

 Orn. 1861, 330 (common in Cuba). 



Hirundo viridis, Wils. Am. Orn. V, 1812, pi. 38. 



Hirundo leucogaster, Stephens, Shaw, Gen. Zool. X, 1817, 105. 



Hah. Whole United States, and north to Slave Lake, south to Guatemala; 

 Bermudas ; Cuba, common in winter. In summer on table-lands of Mexico. 



I find no essential difference in coloration in a large series from 

 different parts of North America, Mexico, and Guatemala. A skin 

 from Fort Rae is larger than the rest, measuring — wing, 4.90 ; tail, 

 2.65. Carlisle specimens measure 4.75 and 2.50, respectively. In 

 a single specimen in the museum of the Philadelphia Academy of 

 Natural Sciences, from California, the back and rump have a steel 

 blue gloss, rather than green — seen to less extent in some Smith- 

 sonian skins from the West Coast — while others exhibit nothing of 

 the kind, and I cannot think that there is any good reason for sup- 

 posing that there may be a western species as distinguished from 

 an eastern. Western and Mexican skins have perhaps a rather 

 smaller bill, and the feathers of the tarsus appear to extend farther 

 along the inner side. 



The occurrence of this species in the high region between Orizaba 

 and City of Mexico, in June, as recorded below, is a fact of great 

 interest. 



Specimens from the whole United States from east to west, and 

 north to boundary ; also — 



