OF RECENT CROCODILIANS. 165 
** Face attenuated, rather high on the sides; sides of the jaws one-coloured. 
6. JACARE PUNCTULATA. (Dotted-jawed Jacaré.) 
Back yellow, banded with brown; the sides of the head yellow; upper and lower 
jaws yellow, one-coloured, or minutely speckled; sides of the neck smooth, with flat 
scales. Nose rather high and square. 
Jacare sclerops, Gray, Cat. Tortoises B. M. 64. 
Crocodilus sclerops, Schn. Amph. 162. Cuvier, Ann. Mus., & Oss. Foss. v. t.1. f. 6 & 7, t. 2. f. 3. 
Tiedem. Amph. 60, t.5. Guérin, Icon. t. 2. f.2 & 10. Gray, Syn. Rept. 62. Dum. & Bib. 
Erp. Gén. iii. 79. 
Crocodilus americanus, Laur. from Seba, t. 104. f. 10. 
Crocodilus caiman, Daud. Rept. ii. 394. 
Caiman (Jacaretinga) punctulatus, Spix, Bras. t. 2 (good). 
Champsa sclerops, Wagner, Syst. t. 7. f. 1, 2, and f. 42. Natterer, Beitr. t. 22 (heads good). 
Alligator punctulatus, Dum. & Bibr. Erp. Gén. u. 91. 
Jacare punctulata, Gray, Ann. & Mag. Nat. Hist. x. 329, 1862. 
Hab. Brazil (Spix); Surinam; Argentine Republic (//. Christy). 
Natterer figures two other species, under the name of Champsa vallifrons (t. 24), 
(Jacare vallifrons, Gray, Cat. B. M. 65), and Ch. punctulata (t. 25) (Jacare punctulata, 
Gray, Cat. B. M. 65), which seem to differ from the former in the head being narrower 
and more tapering. I have seen no specimens agreeing with these figures; but they look 
very like varieties of the above. At the same time, some of our specimens appear to 
have a more attenuated snout than others; but when you apply the callipers to the 
nose and to other parts of the head, the absolute proportions of the parts are very 
nearly the same. 
A stuffed specimen from the Argentine Republic measures 6 feet 9 inches long, the 
head from the occiput is 103, and the nose from the ridge 62 inches. In another, from 
the Zoological Society’s Gardens, 5 feet 10 inches long, the head from the occiput is 
10 inches, the nose from the ridge 64 inches long. A series of young specimens in 
spirits are pale brown, the back and tail with narrow brown cross bands, those on 
the back sometimes broken into square spots; the cheek and outside of the lower jaw 
pale yellow, without spots. The sides of the nuchal disk dark-coloured. 
7. JACARE HIRTICOLLIS. (Rough-necked Jacaré.) 
The scales on the sides of the neck rough, spinulose, pale yellow; back and tail 
brown, cross barred; cheek and sides of the lower jaw yellow, not spotted. 
Hab. Demerara. B. M. 
I may observe that, characteristic as are the figures of Dr. Natterer’s paper, none of 
them exactly agrees in measurements with the specimens in the British Museum. 
In some specimens of the Jacare the first and, sometimes, even the second cervical 
VOL. VI.—PART IV. 2A 
