6. CAIMAN, 295 
Jacare latirostris, part., Gray, Il. ec. 
hirticollis, Gray, ll. cc. pp. 165, 27. 
Alligator ( Jacare) chiapasius, Bocourt, Journ. de Zool. v. p. 400 
(1876) ; Sumichrast, Bull. Soc. Zool. France, 1880, p. 170. 
19 or 20 upper and 18 to 20 lower teeth on each side; fourth 
maxillary tooth much larger than third, in the adult. Head once 
and a half to twice as long as broad; snout more or less obtuse, 
its basal width less than its length ; astrong ridge from one anterior 
border of the orbit to the other, sometimes. produced anteriorly 
towards the fourth maxillary tooth ; orbit not produced anteriorly ; 
interorbital space concave ; upper eyelid rugose or tubercular, often 
more or less produced into a small horn, with a small bony plate 
anteriorly ; supratemporal fosse present. Two or three more or 
less regular transverse series of small postoccipital scutes ; four or 
tive transverse series of large nuchals, all articulated together, usually 
two or three of which are composed of four scutes. Dorsal shield 
composed of 18 or 19 transverse series of scutes, the broadest of 
which contain 8 or 10 scutes; those of the median series very 
obtusely keeled in the adult. Bony ventral shield much developed ; 
the scutes of the outer rows obtusely keeled. All the scutes of the 
body, limbs, and tail bony in the adult. Fingers free, toes webbed 
at the base. Adult uniform blackish ; young pale olive, dotted and 
spotted, or cross-barred, with brown or black. 
The largest specimen in the Collection measures 2 m. 60 centim. 
Central and South America, from the isthmus of Tehuantepec to 
the Rio de la Plata. 
a, oe Her. & yg. Tonala Valley, Chiapas. F. Sumichrast [C.]. 
i) ae 
d. Ye., stffd. Tapana, Tehuantepec. F. Sumichrast [C. }. 
e. Her., stftd. Huamuchal, Guatemala. O. Salvin, Esq. [ P.]. 
eee, Spin: Demerara. W. Carruthers, Esq. [P }. 
g. Yg.. spir. Demerara. 
h,t, k. Hgr. & yg. Demerara. 
stffil. 
l. Yg., spir. Surinam. 
m,n. Her. & yg. Surinam. 
skins. 
o. Ad., stffd. Brazil. 
p. Yg., spir. Brazil. 
q. Ad., stffd. Paraguay. T. J. Hutchison, Esq. 
Pal 
r. Yg., stffd. Sta. Cruz de la Sierra, (Type of J. ocellata.) 
Bolivia. 
s. Ad., stffd. Argentine Republic. W. D. Christie, Esq. [ P.]. 
t. Ad., stffd. Argentine Republic. 
u. Yo., stfid. P (Type of J. longiscutata.) 
v, w. Her., stftd. ? 
aw, Her., skull. -—? 
