[39] FISHERIES OF THE UNITED STATES. 
784. Tachybaptes dominicus (Linn.). SAmvt DomInco GREBE. 
[708 a.] Whole of tropical America, including West 
Indies; north to Rio Grande Valley, in Texas, and 
Lower California. 
a. No. 70597. g ad. Santa Maria, Texas, March 2, 1876; Dr. J. C. 
Merrill. 
735. Podilymbus podiceps (Linn.). THICK-BILLED GREBE. 
[709.] Whole of tropical and temperate America. 
a. No. 88537. ¢ juv. Wheatland, Indiana, October 19, 1882; R. Ridg- 
way. 
b. No. 65554. Pullus. Turtle, Mount Dakota, August 7, 1873; Dr. E. 
Coues, U.S. A. 
(See also Group K of mounted birds.) - 
Family COLYMBID.—The Loons or Drvzrs. 
736. Colymbus torquatus Briinn. Loon. [698.] Northern 
portions of northern hemisphere; in America, breed- 
ing south to northern border of the United States. 
a. No. 68352. Ad. Potomac River, D. C.; S. Wolf. 
737. Colymbus adamsi Gray. GREAT WHITE-BILLED LOON 
Western Arctic America. 
a. No. 44454. Ad. Fort Resolution, June, 1875; J. Lockhart. 
738. Colymbus arcticus Linn. BLACK-THROATED DIVER. 
[699.] Northern parts of northern hemisphere. 
a. No. 76004. Ad. Alaska; E. W. Nelson. 
739. Colymbus pacificus Lawr. PaciFic DIvER.  [700.] 
Pacific coast of North America, breeding far north- 
ward (chiefly in Alaska). 
a. No. 88978. 9 ad. Point Barrow, Alaska, July 4, 1882; M. Smith. 
740. Colymbus septentrionalis Linn. RED-THROATED 
. DIvER. [701.] Northern portions of northern hemi- 
sphere in America, south in winter nearly across 
the United States. 
a. No. 76007. Ad. Saint Michael’s, Alaska; E. W. Nelson. 
Family ALCIDA.—The Aux Trips. 
741. Plautus impennis (Linn.). GREAT AUK. [710.] Believed 
to be now extinct; formerly (previous to 1844) in- 
habiting the islands of the North Atlantic from the 
New England coast (Boston Bay) north to the Are- 
tic Circle. 
