OF RECENT CROCODILIANS. 161 
large square keeled shields. Back scale keeled, the three last cross bands of four scales 
Sides with some strong keeled scales. Back green, black-dotted. 
3. A. punctulatus, p. 91, Spix, Bras. t.2. Head elongate, nose flattened, with a 
rounded point in front, without any preocular ridges, upper eyelid rugose. Nape with 
two rows of shields. Back flat, scarcely keeled. Sides with some larger scales. Yellow, 
black-dotted. 
John Natterer, in his ‘‘ Beitrag zu den Siid-Amerikanischen Alligatoren,” edited by 
Fitzinger, describes eight species of the genus Champsa: five have partly bony eyelids, 
and three have them entirely bony. The five former belong to the genus under con- 
sideration. 
The preorbital ridge distinct, beak broad with three lateral foveole, eyelid striated, 
beak broad and blunt. C. nigra, t. 21. 
The nuchal scutella many, in three series. C. fissipes, t. 22. 
The nuchal scutella many, in two series. C. sclerops, t. 23. 
The preorbital ridge evanescent, beak without lateral foveoli, eyelids rugose. The 
frontal ridge flexuous, bent in front. C. vallifrons, t. 24. 
The frontal ridge arched, bent back. C. punctulata, t. 25. 
M. Natterer gives the following proportional measurements of the heads :— 
Length of Width of Width of Beak 
Length of Width of Crown Crown above the 
Head. Head. before. before. eighth tooth. 
in. 1 mig) OE soe 15 ins: 41. in. 3 
CHampsasmioral. oi omg sieges «eo GY) eh (0) 3 6 4 9 5 dl 
HISSINOS) Btevecosye acter ieee a) Tacs 10 3 6 -o ff 3.8 4 0 
SCLELOPS te tre ere tases shear sae’: ag As 5 68 st} 3.3 3.3 
VALLftONS | mi ateeatetee eines ste M0) 4 6 2 0 2 9 2Ht'3 
PUTO) abe es a cies =) rotate 10 5 5.4 2 ayo Su 2 Died 
The figures of the heads of the last two species differ from that of C. sclerops chiefly in 
the nose being narrower (C. punctulata being the narrowest and very slender), narrower 
than in any specimens that have come under my observation; the lower jaws in the 
figure also differ in shape, that of C. vallifrons being the most slender. Dr. Strauch, 
who had M. Natterer’s specimens to examine, regards the two latter as the same species, 
but distinct from selerops. 
Synopsis of Genera. 
I. The ventral scutelia 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. The orbits united by a bony cross ridge. Eyelids partly striated or 
rugose. 
2. Carman. The orbits not united by a cross ridge. Eyelids bony, entirely smooth. 
