ALLIGATOR. 63 



Croc. Sclerops. Schn. Croc. Americanus, Laur. Seba, t. 

 104. f. 10. Merian, Surin. t. 69, cop. E, M. t. 2, f. 1,2, 

 Croc. Yacare, Daud. Croc. Caiman, Daud. Cuv. Ann. Mus. 

 X. Os. Fos. V. t. 1, f. 7, et 16, t. 2. f. 3. Jacaretinga punc- 

 tulata, Spix. t. 2. Caiman Jissipes et niger, Spix. t. 3, 4. 

 Prince Max. xii. t. 



a. porca frontis antice concava. 



j3. porca antice convexa. 



The beak rather convex, with a cross ridge, which unites 

 the orbits in front. The nape with a band of 6 small scales 

 and the back of the neck with 4 cross bands, each consisting 

 of 2 strongly doubly keeled scales. The back shields are 

 quadrate and 6 rowed. 



Spix, and since him Cuvier, has attempted to divide this 

 species into several. 



1. With a short roundhead, and the frontal ridge con- 

 cave in front and prolonged on each side on the cheek ; the 

 upper jaw with 13 teeth on each side. Some of these, accord- 

 ing to Cuvier, are green, dotted and spotted with black, and 

 black banded on the tail ; others black, with narrow yellow 

 bands, as Caiman niger, Spix, t. 4. 



2. With the head narrower, and the frontal ridge con- 

 cave and less prolonged, with 15 teeth in the upper jaw, 

 and the neck more shielded ; probably Caimanjissipes, Spix, 

 t. 3. 



3. With the head still narrower and the skull scarcely 

 enlarged behind the frontal ridge, which is convex in front 

 and not prolonged on the cheek ; the dorsal shields less 

 keeled, and the tail less distinctly banded; probably the 

 Jacaretinga punctulata, Spix, t. 2. 



2. AlUg. palpehrosus, (Eye-lrowed Alligator .) Rostro sub- 

 convexo, superciliis lamellis osseis tribus tectis, scutellis nuchse 

 6, 4, cervicis 8, 10 in 4, 5 fasciis dispositis. 



Croc, palpehrosus, Cuv. Ann. Mus. x. et Cuv. Os. Fos. 

 V. t. 1, f. 6, 7, t. 2, f. 2. Jacaretinga moschifer, Spix. t. 1. 

 Lacerta Crocodilus, Blumenb. Abb. 



j3. Scutis cervicis irregularibus, carinis elevatis trigonis. 

 Croc, trigonatus, Schn. Seba, i. 1. 105, f. 3, cop. Shaw, Zool. 

 iii. t. . Cuv. Os. Fos. v. t. 2, f. 1. Croc. Niloticus, Laur. 



Habit, in America Meridionali. 



The head rather convex, reddish brown, black banded, 

 smooth between the eyes, the eye-brows with 3 imbedded 

 bony plates, the nape with a band of 4 small shields, and 



