94. LiPosARcus. 239 



below the nostril ; occiput with a rather elevated ridge, scutes of the 

 nape bicarinate. Barbel longer than the eye, which is rather small, 

 its diameter being nearly one-fourth of the width of the interorbital 

 space. Interoperculum without any spines. Thorax and belly en- 

 tirely granulated. Dorsal fin much longer than high, the length of 

 its base being equal to'its distance from the extremity of the snout ; 

 the length of its anterior rays equals that of the head ; there are six 

 scutes between the two dorsal fins. (Caudal fin injured.) Eleven 

 scutes between anal and caudal. The pectoral spiiie does not extend 

 on to the middle of the ventral. Scutes of the body with a serrated 

 keel. Ferruginous grey. 

 Demerara. 



a. Type of the species, 6| inches long : stuffed. From the Collection 



of the Zoological Society. 



2. Liposarcus altipinnis. 

 D. 1/13. A. 5. P. 1/6. V. 1/5. L. lat. 29. 



Head not depressed, its length beijig one-third of the total (with- 

 out caudal) ; it is longer than broad, and has the snout somewhat 

 pointed ; the side of the head below the nostril is somewhat impressed. 

 Occiput and nape very conspicuously elevated. Eye of moderate size, 

 its diameter being one-half of the width of the interorbital space. 

 Teeth minute ; barbel as long as the eye. Interoperculum without any 

 armature. Thorax and belly nearly entirely naked ; some minute gra- 

 nidations are visible on the side of the belly and along the median line. 

 Scutes of the body strongly striated, the middle stria being elevated 

 into a keel. Dorsal fin high, its third ray being considerably longer 

 than the head, and its last extending to the root of the caudal if laid 

 backwards ; the length of its base eqiials its height, and its distance 

 from the extremity of the snout. There are six scutes between the 

 two dorsal fins. Caudal fin obUquely subtruncated, the lower lobe 

 being considerably longer than the upper, and nearly one-third of the 

 total length; anal fin well developed; there are thirteen scutes between 

 the anal and caudal. Pectoral spine extending beyond the base of 

 the ventral. Entirely bro-wnish black ; dorsal fin vrith two series of 

 scarcely conspicuous round black spots along its basal portion. 



River Cupai. 



b. Four and a half inches long. Purchased of Mr. Stevens. 



3. Liposarcus pardalis. 



Ilypostomus pardalis, Otstcln. Aiiim. Amer. Sud, Poiss. p. 42. pi. 20. 

 fig. 3. 



D. ^. A. 1/5. 



Head and body rather depressed and elongate ; scutes of the body 

 strongly keeled. Dorsal fin much longer than high. YcUowish, with 

 numerous brown dots. 



River Amazons. 



