296 CROCODILID®. 
4. Caiman trigonatus. 
Crocodilus trigonatus, Schneid. Hist. Amph. ii. p. 161 (1801); 
Tiedem., Opp., § Lib, Nat. Amph. p. 66, pl. vil. (1817). 
palpebrosus, var. 2, Cuver, Ann. Mus. x. p. 35, pl. ii. fig. 1 
(1807). 
Alligator palpebrosus, var. b, Gray, Syn. Rept. p. 63 (1831); Dum. 
&§ Bibr. ui. p. 72 (1835). 
Champsa trigonata, Natterer, Ann. Wien, Mus. ii. p. 323, pl. xxvi. 
(1840). 
Caiman trigonatus, Gray, Cat. Tort. Se. p. 66 (1844), and Sh. Rept. 
ii. p. 28 (1872). 
Alligator trigonatus, Strauch, Syn. Crocod. pp. 27 & 82 (18C6). 
19 or 20 upper and 20 to 22 lower teeth on each side; third and 
fourth maxillary teeth largest. Head once and three fourths to 
twice as long as broad; snout subacuminate, its basal width con- 
tained once and a half to twice in its length; no cross-ridge in front 
of the interorbital region, which is but slightly concave; upper 
eyelid flat and smooth, entirely bony, the bony plate consisting of 
four distinct pieces; supratemporal fossee obliterated. A single 
series of postoccipital scutes, followed by four or five transverse 
series of large, very highly and sharply keeled nuchals, each com- 
posed of two or sometimes of three or four scutes. Dorsal scutes 
in 18 or 19 transverse series, the broadest of which are composed 
of six scutes; some or all of the posterior (between the hind limbs) 
composed of two or three scutes only ; the dorsal scutes, except the 
two median series, very strongly and highly keeled. The caudal 
crest becomes single on the tenth or eleventh verticil. Dorsal and 
ventral bony armour much developed; sides of body soft, with 
scattered small bony tubercles; gular and outer ventral scutes 
keeled. Fingers free, toes webbed at the base. Yellowish brown 
above, spotted and cross-barred with black. 
Total length 1 m. 40 centim. 
Tropical South America east of the Andes, 
a. Ugr., stfid. Guianas. 
b. Ad., skull. Surinam. 
c. Her., spir. Demerara Falls. 
d. Hgr., spir. Huallaga River, EK. Peru. Mr. E. Bartlett [C.). 
e. Her., skull. Moyombamba, E. Peru. Mr. A. H. Roff[C. ]. 
~ 
S-h, v. Yg., spir. 
5. Caiman palpebrosus. 
Crocodilus palpebrosus, var. 1, Cuvier, Ann. Mus. x. p. 30, pl. i 
fig. 6, & pl. in. fig. 2 (1807). 
palpebrosus, Tiedem., Opp., § Lib. Nat. Amph. p. 64, pl. vi. 
(1817). 
Jacaretinga moschifer, Sper, Lacert. Bras. p. 1, pl. i. (1825). 
Alligator palpebrosus, var. a, Gray, Syn. Rept. p. 63 (1851); Deon. 
& Bibr. iii, p. 69 (1885). 
Champsa palpebrosa, Natterer, Ann. Wien, Mus. ii. p. 324, pl. xxvii. 
(1840). 
