PYGOPODES— COLYMEIDAE— COLYMBDS TOKQUATDS. 



487 



HYDROCHELIDON LAEIFOEMIS (Liun.). 

 Black Tern. 



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



Mydrochelidon lari/ormis, Coxtes, Birds Northwest, 1874, 704. 



Hydrochelidonplumhca, Lawk., Birds N. A., 1858, 864. — Hayd., Trans. Am. Phil. Soc, 



xii, 1862, 176.— Snow, Birds Kan., 1872, 12. 

 Sterna nigra, Heerm., P. E. E. Eep., x. pt. ii, 1859, 73. — Aiken, Proc. Bost. Soc. Nat. 



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

 Mydrochelidon fissipes, CouES, Proc. Acad. Nat. Sci. Phila., 1866, 99 (Colorado Elver). — 



Allen, Bui. Mus. Comp. Zool., iii, 1872, 183 (Eastern Kansas, May). — 



Yarrow & Henshaw, Eep. Orii. 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 eiTatic way over the gi'asses, 

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

 2)i eking 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 se-\»eral showed, 

 consisted entirely of grasshoppers and insects. 



Order PYGOPODES: Diving Birds. 



Fam. COLYMBIDAE: Loons. 



COLYMBUS TOEQUATUS, Brunn. 



Great IVorthern Diver. 



CoUjmbm torquatm, Brunn., Orn. Bor., 1764, No. 134.— Xantus, Proo. Acad. Nat. Sci. 

 Phihi., 1859, 193 (FortTejou, C;il.).— Lawr., Birds N. A., 1858, 888.— Henry, 

 Proc. Acad. Nat. Sci. Phihi., 1859, 109 (New Mexico).— Coop. & Suokl., P. 

 E. E. Rep., xii, pt. ii, 1860, 278.— Coues, Proc. Acad. Nat. Sci. Phila., 1866, 

 100.— Snow, Birds Kan., 1872, 16 — CouES, Key N. A. Birds, 1872, 334.— 

 Yarrow & Henshaw, Eep. Orn. Specs., 1872, Wheeler's Exped., 1874, .33.— 

 CoUFS, Birds Northwest, 1874, 719. 



