Caftor.^ 
3 *. 
imperialis, 
4 - 
Serrator. 
AVES PALMIPEDES. Mergus. 829 
Habitat in borealibus Afia^ America', in Anglia h.yhcvr\o 
tempore invenitur ; in infulis Orcadibus nidificans. — 28 pollices longus. 
Rojirum pedejc\nt rubri. Variat corpore fubtus flavefcente-carneo : 
ampullam feu labyrinthum in trachea habet magnum, ofTeum, atque in- 
fuper arteria afpera ipfa in duplicem ventrem turgefcit. 
M. criflatus cinereus, capite colloque fupremo fpadiceis, gula remigi- 
bus intermediis abdomineque albis. 
Mergus Caftor, Lin. Syjl. i. p. 209. rt^.-^Gmel. Syji. i. p. 545. p. — Faun. 
Helvet. 
Merganfer, fem. Faun. Siiec. p. 48. — Bri/. vi. p. 231. i. 
gulo, Scop. Ann. i. N° 88. 
ferratus, Brun. N° 96. ^ 
* cinereo-albus capite caftaneo, Kram. EI. p. 343. 2. 
cirratus longirofter, Raii Syn. p. 134. A. 2. — Will. p. 253. t, 
64. ( caput.) 
Merganfer cinereus, Bry. vi. p. 254. 7. t. 25. — Id. 8vo. ii. p. 428. 
Anas rubricapilla, Brun. N" 93. 
Le Harle femelle, P/. Enl. 953. — Buf. viii. p. 236. 
Dun-diver, Sparling Fowl, Br. Zool. ii. N® 260. t. 92. f. 2. — Ardi. Zool, 
ii. N“ 465. — Alb. i. t. 87. — PFHL (Angi.) p. 333. t. 64. — Lath, 
Syn. vi. p. 420. 421. A. — Id. Sup. p. 270. 
Hsec avis boreales partes, uti praecedens, frequentat j in Anglia hye- 
me non rarus,— 23-27 pollices longus. — Abdomen nonnullis incarnatum. 
In quibufdam tracheam ampullaceam detexi, quod maribus proprium j 
et in aliis tejies confpicuos vidit Eom. Heyjham ; unde avem diftindarn 
cfTe a Merganjere fufpicor. 
M, ex nigro fufco et grifeo varius, capite laevi, remigibus primoribus 
nigris, fpeculo nullo, roftro pedibufque ex rufefcente albis. 
Mergus imperialis, Gmel. SyJi. i. p. 547. — Cet. uc. Sard. p. 326. 
Habitat in Sardinia ; An/eris magnitudine et forma. — Lingua ciliata. 
M. crifta dependente, pedore rufefcente variegato, collari albo, redri- 
cibus fufcis cinereo variegatis. 
Mergus Serrator, Lin. SyJi. i. p. 208. 3. — Faun. Suee. N° 136. — It. Gott. 
166. 271. — It. Oel. 271. — Borowjk. Nat. iii. p. 22’. 2. — Mulier, 
1 34.— reije, p. i 6 ^,~~-Fam. Groenl. N® 48. — Faun, 
Helvet, 
Serrator 
