404 AVES. 



Heliornis, Bonnat. Podoa, Illig. Grebifoulques, Buff. 



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.(l) 

 ISee App. XXVI of Am. Ed.^ 



Mergus, Briss.(2) Colymbus, Lath. Eudytes, Illig. 



The true Divers have the feet of ordinary Palmipedes, along 

 with all the forms of the Grebes, that is, the anterior toes are united 

 to their ends by membranes, and are terminated by pointed nails. 

 They are northern birds, which rarely breed in France, where they 

 arrive in winter, at which season is occasionally seen on the coast, 



Col. glacialis^ L., Enl. 952^ Col, immer, Gm., Wils. Am. IX, 

 Ixxiv, oj Naum. 66, f. 103. (The Great Northern Diver.) 

 The adult is two feet six inches in length, its head and neck 

 black, changing to a green with a whitish coUarj back, a black- 

 ish brown dotted with whitishj 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, x, 1, 

 Avhich 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 dis- 

 tinguish 



Col. arcticus, L., Edw. 146; Naum. Supp. 30, f. 60; and the 

 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. 94; 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. IMlandi), Quoy and Gaym., Voy. de Freycin., Zool., pi. xxxvi. 



(1) Plotus surinamensis, Gme\., Enl. 893; Heliornis senegalensis, Vieill. Gal. 

 280. M. Ch . Bonap. as well as Gmelin, thinks that this genus should be approx- 

 imated to that of .4/im^fl. 



(2) Mergus (diver), the Latin name of some sea-bird difficult to determine. Lin- 

 naeus, following Gesuer, has applied it to the Merganser. Eudytes, a Greek word 

 composed by [lligor, lias the same meaning. 



