404 AVES, 
< 
Ww ph 
HELIoRNIS, Bogmat. ~ Popo, Liki ge GitcnrebuLaons, Buff. 
5 
The feet lobulate as in the Coots and Grebes, but the tail more 
developed than in either of the two; the nails also are sharper.(1) 
[See App. XXVI of Am. Ed. | .. 7 
% 
Mercvs, Briss.(2)—Cotymsus, Lath.—Eupyres, Illig. 
The true Divers have the feet of ordinaty»Palmipedes, alon 
with all the forms of the Grebes, that is, the anterior toesare nil 
to their ends by membranes, and are terminated by point adits 
They are northern birds, which rarely breed in Fr nc where they _ 
arrive in winter, at which season is occasionally sen onthecas 
Col. glacialis, L., Eni. 9523; Col. immer, Gm., Wils. Am. IX, 
Ixxiv, 3; Naum. 66, f. 103. (The Great Norther ae) 
The adult is two feet six inches in length, its head and neck 
black, changing to a green with a whitish collar; back, a black- 
ish brown dotted with whitish; white beneath; the lower man- 
dible, which has a slight curve upwards, is marked by a groove 
beneath. The young birds, Col. immer, Gm., Briss., VI, 
which more frequently visit the fresh waters, differ considerably 
as to the extent of the black on the neck, and of the grey or 
brown on the back, which, added to their diminished size, has - 
occasioned a multiplication of the number of species. We ‘ 
tinguish ‘ 
Col. arcticus, L., Edw. 146; Naum. Supp. 30, f. 603 and fe 
young, Enl. 914 (The Black-throated Diver), which is some- 
what smaller; the back of the neck ash-coloured, and the lower 
mandible straight and without a groove. The young resemble 
those of the preceding. 
Col. septentrionalis, Enl. 308; Edw. 97; Naum. 67, f. 943 Vieill. 
Gal. 282; Col. stellatus, Gm.; Buff. VIII, xxi; Enl. 992, Naum. 
Supp. 31, f. 62. (The Red-throated Diver.) The adult male is 
brown above, white beneath; face and sides of the neck ash-co- 
loured; front of the neck red. The female and the young are 
brown dotted with white above, and all white beneath. 
belles joues (Pod. kalipareus, Less. and Garn.), Voy. de la Coq., Zool. No. 45;—the 
Gr. Rolland (Pod. Rollandi), Quoy and Gaym., Voy. de Freycin., Zool., pl. xxxvi. 
(1) Plotus surinamensis, Gmel., Enl. 893;—Heliornis senegalensis, Vieill. Gal. 
280. M. Ch. Bonap. as well as inci: thinks that this genus should be approx- 
imated to that of Anhinga. 
(2) Mergus (diver), the Latin name of some sea-bird difficult to determine. Lin- 
nzus, following Gesner, has applied it to the Merganser. Eudytes, a Greek word 
composed by Illiger, has the same meaning. 
