I 84 VERTEBRATES : BIRDS. 



inches long, the wing three and three quarters inches ; 

 the color light red, back more dusky. 



The Rocky Mountain Tanager, P. hepatica, Sw., is eight 

 inches long, and dark scarlet-red tinged with ashy on the 

 back and sides. 



The Louisiana Tanager, P. hidoviciana, Bonap., of 

 Western North America, is seven and a quarter inches 

 long, the wing over three and a half inches ; the general 

 color of the interscapular region, wings, and tail, black ; 

 head and throat tinged with scarlet, and the wings with 

 two whitish bands. 



The Genus Euphonia comprises the Blue-headed Tana- 

 ger, E. elegantissima, Gray, of Mexico, which is about 

 four and two thirds inches long, the wing two and three 

 quarters inches, bluish black above, yellowish below, the 

 top of the head blue. 



HIRUNDINID.E, OR SWALLOW FAMILY. This Family 

 comprises birds with a very short, depressed, and tri- 

 angular bill, very long wings, very short tarsi, and tail 

 generally forked. 



The Genus Hirundo has the tail more or less forked. 



The Barn Swallow, H. horreonnn, Barton, of North 

 America, is six and nine tenths inches long, the wings 

 five inches, and the tail excessively forked ; the color 

 steel-blue above, forehead and throat chestnut brown, 

 belly reddish white. 



The Cliff Swallow, H. lunifrons, Say, of North America, 

 is five inches long, the wing less than four and a half 

 inches, the tail emarginate, the crown and back steel- 

 blue, throat and sides of the head dark chestnut, breast 

 fuscous, belly white. 



The White-bellied Swallow, H. bicolor, Vieill., of North 

 America, is six and a quarter inches long, the wing five 

 inches ; glossy metallic green above, white beneath. 



The Violet-Green Swallow, H. tkalassina, Sw., of West- 



