3, CROCODILUS. 281 
4, Crocodilus americanus. 
Schneid, Hist. Amph., ii. p. 23 (1801) ; Geoffr. Ann. Mus, ii. pl. xxxvii, 
fig. 1 (1803), 
Crocodilus americanus, Law’. Syn. Rept. p. 54 (1768); Gray, Cat. 
Tort. §c. p. 60 (1844); Hucvley, Jowrn. Iinn, Soc. iv. p. 11 
(1860) ; Bocourt, Miss. Sc. Mex., Rept. p. 30, pl. viii. fig. 1, & 
pl. ix. fig. 1 (1870); Giinth, Biol. C.-Am., Rept. p. 19 (1885), 
acutus, Cuv. Ann, Mus. x. p. 55, pls. 1. & i. (1807); Geoff. Ann, 
Mus. x. p, 70 (1807); Tvedem., Opp., § Lib. Nat. Amph. p. 78, 
pl. xiii. (1817); Dum. § Bibr. iii. p. 119 (1836); Coct. in R. de la 
Sagra, Hist. Cuba, Rept. p. 62, pl. v. (1845) ; Strauch, Syn. Crocod. 
pp. 56 & 102 (1866) ; Wyman, Amer. Journ. xlix. p. 105 (1870). 
biscutatus, Cav. 1. ¢, p. 53, pl. i. fig. 6; ZLiedem., Opp., § Lib. 
op. cit. p. 77, pl. xii. 
Molinia americana, Gray, Ann. § Mag. N. H. (8) x. p. 272 (1862), 
and Trans. Zool. Soc, vi. p. 150 (1867), and Cat. Sh. Rept. ii. 
p. 17 (1872). 
Crocodilus pacificus, Bocourt, 1. c. p. 31, pl. ix. fig. 5. 
lewyanus, Bocourt, l. c. p. 38, pl. viii. fig. 2. 
—— mexicanus, Bocourt, l, c. p. 84, pl. viii. fig. 3. 
18 or 19 upper teeth on each side. Snout variable in length, 
once and three fifths to twice and one fourth as long as broad at 
the base; a median ridge or longitudinal swelling along the snout ; 
mandibular symphysis extending to the fourth or afth tooth ; pre- 
maxillo-maxillary suture, on the palate, directed backwards ; maxil- 
laries forming a short median suture above, or narrowly separated 
by the nasals. Usually four large nuchals forming a square, with a 
smaller one on each side of the anterior pair; the large nuchals 
sometimes followed by one or two detached pairs of smaller scutes ; 
usually two pairs of smaller nuchals in a transverse row behind the 
occiput. Dorsal scutes well separated from the nuchals, in 15 or 
16 transverse and four or six longitudinal rows ; the scutes of the 
two median rows regularly arranged, the others more or less 
irregular and more strongly keeled; sides with scattered keeled 
scutes. A slight web between the second and third fingers ; outer 
toes extensively webbed. A serrated fringe on the outer edge of 
the leg; scales on the limbs keeled. Blackish olive above, yellowish 
inferiorly ; young pale olive, dotted and spotted with black. 
The largest specimen in the Collection measures 34 metres. 
Ecuador, Colombia, Venezuela, Central America, West Indies, 
Florida. 
a. Y2., spir. W. Ecuador, Mr, Fraser [C.]. 
b. Yg., skin. Chepo, Panama. O. Salvin, Esq. [C.]. 
e. Ad., stfid. San Juan de Nicaragua, G. P) Williams, Esq. 
(eal 
d, Yg., spir. Nicaragua, Sir J. Richardson [P.}. 
e. Her., stffd. Guatemala. O. Salvin, Esq. [C. | 
f. Yg., stffd. Tapana, Tehuantepec. F. Sumichrast hel 
g. Yg., spir. Mazatlan. Mr. Forrer [{C.]. 
h,t. Yg., skins. Presidio, Mr. Forrer | C. |. 
