290 CROCODILTDJE. 



4. Caiman trigonatus. 



Crocodilus trigonatus, Schneid. Jlisf. Amph. ii. p. IGl (1801); 



Tiedem., 0pp., ^ Lib. Nat. Amph. p. m, pi. vii. (1817). 

 palpebrosus, var. 2, Chivier, Ann. Mus. x. p. o5, pi. ii. fig. 1 



(ISOD. 

 Alligator palpebrosua, var. b, Gray, Syn. Eept. p. 03 (1831); Dum. 



^- Bibr.m. p. 7-2 {\f<•:^h). 

 Chaiupsa trigonata, Nattcrer, Ann. Wien. Mm. ii. p. 3i'3, pi. xxvi. 



(1840). 

 Caiman trigonitus, Gray, Cat. Tort. 1^-c. p. GO (1844), and Sh. liept. 



ii. p. 28 (1872). 

 Alligator trigonatus, Strauch, Syn. Crocod. pp. 27 & 82 (18('0). 



19 or 20 upper and 20 to 22 lower teeth on each side ; tliird and 

 fourth maxillary teeth largest. Head once and three fourtlis to 

 twice as long as broad ; snout subacuminate, its basal width con- 

 tained once and a half to twice in its length ; no cross-iidge in front 

 of tlie iuterorbital region, which is but slightly concave; upper 

 eyelid flat and smooth, entirely bony, the bony plate consisting of 

 four distinct pieces ; supratemporal fossic obliterated. A single 

 series of postoccipital scutes, followed by four or five transverse 

 series of large, very highly and sluirply l<eeled nuchals, each com- 

 posed of two or sometimes of three or four scutes. Dorsal scutes 

 in 18 or 19 transverse series, the broadest of which are composed 

 of six sciites ; some or all of the posterior (between the hind limbs) 

 composed of two or three scutes only ; the dorsal scutes, except the 

 two median series, very strongly and higlily keeled. The caudal 

 crest becomes single on the tenth or eleventh verticil. Dorsal and 

 ventral bony armour much developed ; sides of body soft, with 

 scattered small bony tubercles : gular and outer ventral scutes 

 keeled. Fingers free, toes webbed at the base. Yellowish brown 

 above, spotted and cross-barred with black. 



Total length 1 m. 40 centim. 



Tropical South America east of the Andes. 



a. 



Hffr., stfTd. Guianas. 



h. Ad., skull. Surinam. 



c. Ilgr., spir. Demerara Falls. 



d. Hgr., spir. Hualla^a River, E. Peru. Mr. E. Bartlett [C.]. 



e. Hgr., skull. Moyom^bamba, E. Peru. Mr. A. H. Koft"[C.J. 

 f~h, i. Yg., spir. P 



Caiman palpebrosus. 



C 



'rocodilus palpebrosus, var. 1, Ciaicr, Ann. Mus. x. p. 35, pi. i. 

 tig. 0, & pi. ii. fig. 2 (18C7). 

 palpebrosus, Tiedem., 0pp., Sf Lib. Nut. Amph. p. 04, pi. vi. 



(1817). 

 Jataretinga moschifer, Spi.r, Lacert. Bras. p. 1, pi. i. (182o). 

 Alligator ])alpebrosus, var. a, Gray, Syn. Rept. p. 0;5 (1831); Dum. 



4- Bihr. iii. p. <)0 (l?<3o). 

 <^ liamp.sa palpebrosa, Natfercr, Ann. IVien. Mus. ii. p. 324, pi. xxvii. 



(ifiiO). 



