n. fMMAX. 2i)."{ 



the fourth maxillary tooth, the other from the frontal pits to the 

 tifth priLMiiaxillar)- tooth ; orbit produocd anteriorly to the vertical 

 of the ninth or tenth maxillary (ootli ; ujiiier eyelid tlat, finely 

 striated above, with a small bony plate anteriorly ; supratemporal 

 fosstc present ; vomer visible on the palate as a small rhoniboidal 

 j)latc. Four or five transverse series of small postoccipital seutes ; 

 four transverse series of large nuchals, the first t-rt'o composed 

 of four scutes, all articulated together. Dorsal shield composed 

 of Id transverse series of scutes, the broadest of whieh contain 

 ten scutes; all strongly and sharply keeled. Ventral scutes bony 

 and imbricate, except on the posterior abdominal region, where the 

 ossitications are absent or reduced to a small nucleus. Fingers free, 

 outer toes half-webbed. Black above, yellow interiorly. 



Total length 4 metres. 



Tropical South America east of the Andes. 



R. Graham, Esq. [P.l 

 R. Graliau), Esq. [P.]. 

 Mr. E. Rartlett lC.]. 



2. Caiman latirostris. 



Crocodilus latirostris, JJaiuL JRept. ii, p. 417 (1802). 



Caiman tissipes, tipi.r, Lacert. Bras. p. 4, pi. iii. (l«2o). 



Champsa fisipes, Wcujl. Icon. Aynph. pi. xvii. (1830) ; Natterer, 



Ann. Wien. Mm. ii. p. .'521, pi. xxii. (1840). 

 Cro.-ddilus sclerops {non Schn.), Wied, Abbild. (1831). 

 Alligator sclerops, part., Gray, Si/n. liept. p. (52 (1831). 



cynocephahis, Ihini. ^- Bihr. iii. p. 86 (1836). 



Jacare tissipes. Gray, Cat. Tort. ^'c. p. 64 (1844). 



latirostris, part., (^ray, Ann. ^- May. N. II. (3) x. p. 328 



(1862), and Tr. Zuol Soc. vi. p. 163 (1867), and Cat. Sh. Rent. 



ii. p. 2-5 (1872). 

 Alligator latirostris, Strancfi, Syn. Crocnd. pp. 10 .t 73 (1866) ; Ilcnsel, 



Arch. f. Nat. 18(i8, p. 384 j Burmeisler, Ann. >i'oc. Aryent. ix. 



p. 244 (1880). 



18 or 1!' upper and 17 or 18 lower teeth on each side ; fourth 

 maxillary tootli much longer than third. Head not more than once 

 and a half as long as broad ; snout very broad and lounded, its 

 basal width nearly equalling its length ; a strong ridge from one 

 anterior border of the orbit to the other, more or less ])roduced 

 anteriorly towards the fourth maxillary tooth ; orbit not produced 

 anteriorly; interorbital space concave; uj)per eyelid rugose or 

 tubercular, more or less produced into a small horn, with a small 

 bony plate anteriorly ; supratemporal fossa3 present. Two more or 

 less regular transverse scries of small postoccipital scutes ; three or 

 four transverse series of large nuchal.^, the anterior composed of 

 four scutes, the others of two. the transverse series separated from 

 each, other by an interspace. Dorsal shield composed ot 18 transverse 

 series of scutes, the broadest of which contain 8 or rarel}- 10 scutes ; 

 those of the median series verv obtuselv keeled in the ndnlt. Bonv 



