ALLIGATORS. 67 



long, rather gibbous ; muzzle elongate, attenuate, rather convex 

 above; brown, black-banded, beneath whitish, black-varied. 



a. Very youug, in spirits. 



The Eyebrowed Cayman. Caiman palpebrosus. Crocodilus 

 palpebrosus, Cuv. Ann. Mus. x. &r Oss. Fos. v. t. 2,/. 2. Tiedem. 

 Amph. 16. Gray, Syn. 63. Dum. et Bib. E. G. iii. 69. Wayler, 

 Syst. 140. Natterer, Ann. Mus. Vien. i. 324, t. 27. Lacerta cro- 

 codilus, Blumenb. Handb. 245. Jacaretinga moschifer, Spix, 

 Braz. t. 1. 



Two broad rows of plates on the nape ; shields of the back 

 slightly keeled, equal, the 14th and 15th cross rows on the back 

 composed of 4 shields ; head triangular, oblong, rather gibbous ; 

 muzzle elongate, attenuate, above rather convex. 



Inhab. Brazils. 



The Swollen-headed Cayman. Caiman gibbiceps. Champ- 

 sa gibbiceps, Natterer, Ann. Mus. Vienna, 1. 324, t. 28. 



Head triangular, oblong, gibbous; muzzle elongate, attenuate, 

 excavated above ; nuchal shields many, in 2 rows, trigonal acute, 

 cervical very acutely keeled, in 5 bands, the 2nd and 3rd bands of 

 3 shields, middle shield bicuspid, the rest in pairs ; dorsal shields 

 very acutely keeled ; two vertebral series rather blunter ; black- 

 brown, beneath pale whitish varied. 



Tropical America. Mus. Vienna. 



