siusculum, coarclalutn, supra inler oculos comprcssuni, canaliculalum, anlice Irans- 

 versini semicirculariter cristalum, vcrsus nares noquo crislalum neque foveatum; 

 palpcbrae membranaceae, coriaceae, rugosae, ad margincm subtluplicatae; margo occi- 

 pitis lateralis non rellexus, reclus, posticus vix sinualus," Inigua angulusque men- 

 talis angusliores ; maxilla inferior apice haud plana; (lenles superiores et inferiores 

 utrincjue 2o; gula flava, hinc inde nigro punclala ; scuta nuchalia sericbus 7 dispo- 

 sila , quarum i^ et 2* scula in medio niinima, laleraliter minora, excurrentia, 5'- 7"" 

 scula subbicuspidata, in media nucha longitudinaliter posita et cum scutis ihoracicis 

 abscjue intervallo cohaerentia continent; scuta thoracica subcj[uadrata , in medio dorso 

 non carinata, lateralia subcarinata, ab humeris uscjue ad femora in 17 segmenta 

 divisa , c^uoruni 1"' scuta 4? ^i"''^ subsecj[uentia sc. 6, c|uinque subs. scuta 10, quincjue 

 subsec^. sc. Sj unvim subsec[. sc. 4? ^^^ subs. sc. 8» scgmenta caudalia subseciuentia 

 scuta6 continent, cjuorum decem lateraliterutrinquecristata,relic|ua2i unicristata; scutella 

 pedum apice trigona , medio vix crislata; scula abdominalia cjuadrala , plana, scutis 

 dorsi vix maiora , cjuorum segmenta collaria trigono- sinuata , in regione claviculari 

 largiora c£uam in Caimano nigro , sed minora tjuam in Jacaretinga moschifero ; 

 pedes posleriores magis semipalmati c£uam in Jacaretinga moschifero. Longitudocor- 

 poris speciminis adulti et hic depicli 5°, capitis 5', colli 5', ihoracis 8', caudae 1° 4^^'; 

 latitudo arcus maxilLiris pone mentum 5". 



Habitat solitarius prope Ecgam, in ripa Solimoens diu dormiens et Jaca- 

 retinga (Jacare minor) ab incolis dictus; difiert ab Alligatore palpebroso longitu- 

 dine multo minore, crista interoculari transversa palpebriscjue membranosis, a Scle- 

 rope Cuv. rostro non obtuso sed acuto, a Cr. trigonato Schneid. scutis cervica- 

 libus non irregularibus. 



Genus ir. CAIMAN sive ALLIGATOR (JACARE). 



Rostrum non acutinn sed obtusum, supra depressum , largiusculum ; arcus maxiUaris inferior 

 patens, obtusus, applanatus ; pedes postcriores vel Jissi vel frequenter semipalmati; dens in- 

 ferior utrinque quartus in Jossam maxillae superioris reconclendus. 



Species I. CAIMAN sive NIGER. Tab. IV. 



Nigerrimus , semipalmatus , supra flavo sparsim maculatus sive subfasciatus j capite virescente, supra in- 

 ter oculos compresso , canaliculato , anlice transversim et versus maxillae marginem oblique 

 cristato ac fovealo ; palpebris versus marginem non duplicalis, non osseis; 4 seriebus scutorum 

 postoccipitalium transverse lateque excurrenlibus, 5 aliis in media cervice positis. 



J--' ESCRiPTio. Corpus supra nigerrimum, flavo sparsim maculatum vel subfas- 

 ciatum, relucens, subtus immaculato-flavum; caput virescens, in maxilla inferiore 



