ALLIGATOR. 63 



Croc. Sclerops. Schn. Croc. Americanns, 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. Jacaret'niga piinc- 

 tulata, Spix. t. 2. Caiman fiss'ipes et niger, Spix. t. 3, 4. 

 Prince Max. xii. t. 



a. porcafrontis antice concava. 



/3. 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 round head, and the frontal ridge con- 

 cave m 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 Caiman Jissi pes, 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 

 Jacarctinga punctulata, Spix, t. 2, 



3. AlUg. paJpelrosus, (Eye-lroiued Alligator.) Rostro sub- 

 convexo, superciliis lamellis osseis tribus tectis, scutellis nuchae 

 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 Crocodiliis, Blumenb. Abb. 



j3. Scutis cervicis irregularibus, carinis elevatis trigonis. 

 Croc, trigonatus, Schn, Seba, i. t. 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 



