1903.] NATURAL SCIEXCES OF PHILADELPHIA. 525 



78. Characinus gibbosus (Linn.)- 



Three specimens (192), Laguna of Arroyo Trementina. 



Head 3|-3f ; depth 2|-2|; lat. L, 55-59; D. 10 or 11; A. 50-53. 



79. Characinus squamosus sp. nov. 



T3'pe No. 9,961, a specimen (72), 215 mm., Pasito Lagmia. This 

 species is at once distinguished by its small scales and long anal. 



Head 4; depth 3f ; D. 12; A. 54; P. 14; V. 8; lat. 1., 112. 



Profile nearly straight from tip of snout to nape. At the nape it 

 rises abruptly for about i of the distance to the dorsal, from which 

 point to the origin of the dorsal the slope is very gradual. The slope 

 of the back from the origin of the dorsal to its last ray is downward 

 and rather steeper than from the dorsal to the caudal peduncle, which 

 slope is also very slightly convex. 



Lower sides of body evenly curved from the tip of snout to vent. 

 The base of the anal nearly straight. 



Anterior portion of the head shaped very much as in Cynopotamus 

 kneri. 



Snout elongate, 3 in length of head. Eye large, 4| in head, 1^ in 

 interorbital. 



A narrow, unsealed, occipital process equal to the snout in length. 

 Suborbitals moderate, only half covering the lower part of the pre- 

 opercle. The angle of the preopercle rounded, not with a backwardly 

 projecting angle as in C. gibbosus. 



^laxillary almost straight, reaching far beyond the eye, finely toothed 

 its entire length. ^Mandible when closed shorter than snout. 



Premaxillary teeth in two series; the outer contains 2 canines in 

 front and a smaller one on each side at the end of each premaxillary 

 bone; the inner series of two smaller canines on each side. Maxillary 

 with a single series of teeth its entire length. 



Mandibular teeth in a single series in the following order: 1st, ten 

 minute teeth ; 2d, a canine corresponding to the upper front canine ; 3d, 

 a small canine pointing obliquely upward and outward ; 4th, a large 

 canine fitting into a cavity in the upper jaw; 5th, a small canine cor- 

 responding to the upper posterior canine and followed, 6th, by a series 

 of closely set small teeth. 



Dorsal slightly falcate, its longest ray 5 times in total length to tip 

 of middle caudal rays. Pectorals to middle of ventrals. Ventrals 

 not reaching origin of anal. Anal long and low, its fourth ray the 

 longest, 2^ times length of last ray. Caudal forked, scaled well up 

 on the lobes. 



Lat. fine 112, almost straight, very slightly decurved in front. 



