162 DR. J. E. GRAYS SYNOPSIS OF THE SPECIES 
Il. The ventral scutella thin, the dorsal scutella bony, not articulated together. The 
eyelids fleshy, smooth. The cervical scutella in pairs, separate. Nasal bone 
elongate, separating the nostrils. North America. 
3. AtLicator. The face broad, depressed. 
Section I. The ventral scutella like the dorsal ones, bony and articulated together, 
forming a shield. The eyelids with an internal bony plate. The cervical scutella 
in pairs, forming an elongated shield. Nasal bone short. ‘Tropical America. 
1. JACARE. 
Head moderately high, shelving on the sides. Orbits united by a distinct bony 
cross ridge. Eyelids striated or rugose, strengthened by a small internal bone. The 
cervical scutella four or five pairs, forming a shield; the dorsal and ventral scutella 
both consolidated together, forming a dorsal and yentral shield; the gular and ventral 
scutella smooth. 
Jacare, Gray, Cat. Tort.Croc. &c. B.M.64,1844; Ann. & Mag. N.H. 3rd series, x. 327, 1862. Husley, 
Proc. Linn. Soe. 1859, 4. 
Jacaretinga, Spix, Lacert. 
The pits in the maxilla are the cavities left by the preorbital ridges as they advance. 
The intermaxillary bone short, truncated behind, with an elongate-oval or lanceolate 
cavity between this and the front of the palate. 
The figures of Natterer’ are excellent to general appearance, but they do not agree 
with the measurements of our specimen; that is to say, the nose of Champsa jissipes, 
from the ridge, is about the same length as the forehead, but in his figure it is 
represented as larger, and it is so in all the other figures: perhaps this is to allow for 
the perspective. 
A. Head elongate ; interorbital ridges strong. Dorsal scutella elongate, keeled, keels of 
vertebral series highest ; lumbar scutella in six longitudinal series. Nuchal scutella 
small, compressed. Eyelids striated, with a rather large internal bone. Back 
black varied with yellow. Melanosuchus, Gray, Ann. & Mag. N. H. x. 328. 
1. JAcarE niGRA. (Black Jacare.) 
Crocodilus sclerops, Schn, Amph. 162. Blainy. Ostéogr. Crocod. t. 3. f. 2, t. 4. f. 18. 
Crocodilus yakare, Daud. 
Alligator sclerops, Cuvier, Oss. Foss. v. 35, t. 1. f.6 & 7,t. 2. f. 3.  Briihl, Skelet. Krokod. t. 12. 
f. 3,5, 6,7, 19. els 
Alligator sclerops, var., Gray, Syn. Rept. 
Caiman niger, Spix, Bras. t. 4 (good). 
Champsa nigra, Natterer, Beitr. t. 21 (good). 
