136 PROCEEDINGS OF THE ACADEMY OF 



in front of it, exceeding the length of the pectoral spines by two 

 iuterradial spaces. 



Color olivaceous above with numerous black spots, which inos- 

 culate on the dorsal jegion ; below lighter with numerous closely 

 placed black spots. Fins clouded. Head very closely radiate, 

 banded and spotted. 



Total length .400 m. (15.75 inches) ; length to bases of caudal, 

 .305 ; do. to anal, .200 ; do. to ventral, .140 ; do. to pectoral, .060 ; 

 do. to edge of inferior lip, .034 ; do. to superior teeth, .011. Length 

 of first dorsal spine, .0*11 ; humeral width, .077. 



Two specimens from Nauta, Peru. Dedicated to Joseph Jeanes, 

 of Philadelphia, one of the most liberal patrons of students of 

 the Natural Sciences in the United States. 



Liposarcus scrophus, sp. nov. 



Size of the last species but much more robust and rough in 

 character. The dorsal outlines arched, rising abruptly in a strong 

 crest on the posterior cephalic scutum, and maintained bj^ the 

 rough lateral keels of the nuchal plates. The head enters the 

 total length 4.25 times, and the greatest depth the same, five 

 times. An obtuse ridge to nares and a low swelling on the upper 

 part of the pterotic shield. There is an angular tuberosity on the 

 upper posterior part of the orbit, and a low ridge on the inner 

 side of each of the nares. Barbel only extending to line of interior 

 nostril. Several strong spines on the interoperculum. Diameter 

 entering length of side of muzzle four times, and three and a 

 quarter times the interorbital width. Sculpture of the upper sur- 

 faces of the head consisting of lines of minute acute tubercles, 

 which are nearly obsolete on the interorbital. 



Lower surfaces everywhere rugose. Scuta in twenty-seven 

 transverse, and four longitudinal series, all rugose with lines of 

 points and each with an elevated keel-brush of small spines. The 

 upper and lower series of lateral scuta are strongly angulate, and 

 the sides are swollen from opposite the base of the dorsal fin. 

 Five scuta between the dorsal fins and thirteen between the anal 

 and caudal fins. Radii of tins ; D. II. 12 ; C. I. 14, I ; A. I. 4 ; Y. 

 I. 5 ; P. I. C. Dorsal fin longer than high, entering total length 

 3.5 times and a little less than length in front of its first spine. 

 Length of latter equal length of head to end of interoperculum. 

 Pectoral fin stout, shorter than basis of dorsal fin by three inter- 

 spaces. The lower caudal lobe is, as in L. jeaiiesianus consider- 



