PYGOPODES COLYMBtDAE COLYMBUS TORQUATUS. 



487 



HYDROCHELIDON LARIFORMIS (Liun.). 

 Black Tern. 



Rallus lariformis, LINN., Syst. Nat., i, 10th ed., 1758, 153. 



Hydrochelidon lariformis, COUES, Birds Northwest, 1874, 704. 



Hydrochelidon plumbca, LAWR., Birds N. A., 1858, 8G4. HAYD., Trans. Am. Phil. Soc., 



xii, 1862, 176. SNOW, Birds Kan., 1872, 12. 

 Sterna nigra, HEERM., P. R. R. Eep., x. pt. ii, 1859, 73. AIKEN, Proc. Bost. Soc. Nat. 



Hist., xr, 1872, 210 (Colorado). 

 Hydrochelidon Jissipes, COUES, Proc. Acad. Nat. Sci. Phila., 1866, 99 (Colorado River). 



ALLEN, Bui. Mas. Com p. Zoo'I., iii, 1872, 183 (Eastern Kansas, May). 



YARROW & HENSUAW, Rep. Orn. Specs., 1872, Wheeler's Exped., 1874, 33. 



This species was present on Utah Lake in July, two individuals being 

 seen. In Arizona, I noticed quite a number of these terns on a marsh at 

 Sulphur Spring. They were flying in a very erratic way over the grasses, 

 now keeping a few feet above the tops, now dropping suddenly down and 

 picking off from the stems the insects, and especially the grasshoppers their 

 sharp eyes had detected. There were several pools of water in the vicinity, 

 which, however, they rarely visited, apparently finding in the manner 

 described a sufficiency of food, which, as the dissection of several showed, 

 consisted entirely of grasshoppers and insects. 



ORDER PYGOPODES: DIVING BIRDS. 



FAM. COLYMBIDAE: LOONS. 



COLYMBUS TORQUATUS, Brunn. 

 Great Northern Diver. 



Clymbu* torquatux, BRUNN., Orn. Bor., 1764, No. 134. XANTUS, Proc. Acad. Nat. Sci. 

 Phila., 1859, 193 (FortTejon, Cal.). LAWK., Birds N. A., 1858, 888. HENRY, 

 Proc. Acad. Nat. Sci. Phila., 1859, 109 (New Mexico). Coop. & SUOKL., P. 

 II. R. Rep., xii, pt. ii, 1860, 278. COUES, Proc. Ac-art. Nat, Sci. Phila., 1866, 

 100. SNOW, Birds Ksiu., 1872, 16 COUES, Key N. A. Birds, 1872, 334. 

 YARROW & HENSIIAW, Rep. Orn. Specs., 1872, Wheeler's Expert., 1874, 33. 

 COUES, Birds Nort Invest, 1874, 719. 



