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U. S. p. E. R. EXP. AND SURVEYS — ZOOLOGY — GENERAL REPORT. 



color extending a short distance around towards the nape. Kump light chestnut. Forehead 

 and middle of belly brownish or dull yellow brownish white ; the upper part of the breast and 

 the sides of the body light grayish brown. A large spot on the throat crossing the line of 

 separation between the chestnut and brown, steel blue ; this sometimes seea in the chin. 



The lores and a very narrow line along the base of the bill are black. The feathers on the 

 middle of the back exhibit whitish edges, more or less conspicuously. Wings and tail brown, the 

 secondaries with lighter margins. 



The female is not appreciably different in color. 



The young lacks the frontal band, and the gray collar on the nape is only faintly indicated. 

 There is usually a good deal of white on the throat, on the lower part of which the black spot 

 is more extended and less distinct than in the adult. 



Specimens^ vary in the extent of chestnut on the rump, in the width and precise shade of the 

 frontal patch, &c. 



This species differs from the true Hirundofulva, VieiUot Encyclop. 527, of the West Indies, 

 in the larger size, lighter colored rump, and in the presence of a black spot on the throat. 



List of specimens. 



HIEUNDO BICOLOR, Vieillot. 

 White-bellied Swallow. 



Hirundo bicolor, Vielliot, Ois. Am. Sept. I, 1807, 61; pi. xxxi. — Addubon, Orn. Biog. 1831,491; pi. 98. — Ib. Sjn. 



1839, 35.— Ib. Birds Araer. I, 1840, 175 ; pi. 46.— Cassin, lUust. I, 1855, 244.— Brewer, N. Am. 



Oology, I, 1857, 100 ; pi. iv, fig. 47. (Egg.) 

 Tttchycineta bicolor, Cabanis, Mus. Hein. 1850- '51, 48. 

 Herse bicolor, Bonap. Conspectus, 1850, 341. 

 Hirundo viridis, WiftoN, Am. Orn. V, 1812, 49 ; pi. xxxviii. 

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



gp. Ch. Glossy metallic green above ; entirely white beneath. Female much duUerin color. Wing 5 inches. 



Length, 6.35 inches ; wing, 5.00 ; tail, 2.65. 

 Hob. — North America from Atlantic to Pacific. 



