OP EECENT CEOCODILIANS. 165 



** Face rdtenuated, rather M(jh on the sides; sides of the jaivs one-cohured. 



6. Jacare punctulata. (Dotted-jawed Jacare.) 



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. 



Crocodi/us sclerops, Schu. Ampli. 162. Cuvier, Ami. Mus., & Oss. Foss. v. 1. 1. f. 6 & 7, t. 3. f. 3. 



Tiedem. Amph. 60, t. 5. Guerin, Icon. t. 2. f. 3 & 10. Gray, Syn. Kept. 62. Dum. & Bib. 



Erp. Gen. iii. 79. 

 Crocodiias americanus, Laur. from Seba, t. 104. f. 10. 

 Crocodilus caiman, Daud. Rept. iii. 394. 

 Caiman {Jacaretiiiya) punctidatus, Spix, Bras. t. 3 (good). 



Champsa sclerops, Wagner, Syst. t. 7. f 1, 2, and f. 42. Natterer, Beitr. t. 22 (heads good). 

 Alligator punctidatus, Dum. & Bibr. Erp. Gen. ii. 91. 

 Jacare punctulata, Graj', Ann. & Mag. Nat. Hist. x. 329, 1863. 



Hob. Brazil [Spix); Surinam; Argentine Republic (//. Christ ij). 



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 Ai'gentine Eepublic measures 6 feet 9 inches long, the 

 head from the occiput is 10^, and the nose from the ridge 6^ inches. In another, from 

 the Zoological Society's Gardens, 5 feet 10 inches long, the head from the occiput is 

 10 inches, the no.se from the ridge 6^ inches long. A series of young specimens in 

 spirits ai-e pale brovra, 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. Jacaee hirticollis. (Rough-necked Jacare.) 



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. 



llab. 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 c(-rN ical 

 VOL. VI. — part IV. 2 A 



