96 MEMOIRS OF THE CARNEGIE MUSEUM. 



Maxillary extending to the vertical from the anterior margin of eye. Origin 

 of dorsal equidistant from snout and base of caudal, its height greater than head. 



Pectorals extending to ventrals, origin of ventrals in advance of dorsal, extend- 

 ing nearly to the anal. Caudal peduncle as long as deep. 



Olivaceous, sides silvery, or a silvery longitudinal stripe from operculum to 

 base of caudal; an indistinct dark humeral spot; a blackish spot at the base of 

 caudal, ending posteriorly in a point and margined with yellow above and below; 

 dorsal and anal pink. 



53. Odontostilbe paraguayensis Eigenmann & Kennedy. (Plate XVI, fig. 2; 



plate XVII, fig. 3.) 



Odontostilbe paraguayensis Eigenmann & Kennedy, Proc. Acad. Sci. Phila., 1903, 



p. 512 (Asuncion; Arroyo Trementina); Eigenmann, Ann. Carnegie Museum, 



Vol. IV, 1907, p. 125 (Corumba); Reports Princeton Univ. Patagonia, Vol. 

 Ill, 1910, p. 429. 



Range: Paraguay basin. 



9988, I. U. M., type, 40 mm. Asuncion. J. D. Anisits. 



10111, I. U. M., three, 40 mm. Arroyo Trementina. J. D. Anisits. 



10178, I. U. M., five, Corumba. J. D. Anisits. 



6853a-m, C. M., fourteen, 22-39 mm. Asuncion, March 29, 1909. J. D. 

 Haseman. 



This is the deepest of the species of Odontostilbe, greatly differing from the type, 

 0. fugitiva, in depth. 



Head 3.75-4.5; depth adult female 2.6, adult male 3; D. 11; A. 21-24; 

 scales 6-32 to 35-4; eye 2.66-3 in head, about equal to interorbital; depth of 

 caudal peduncle 2.66-3.25 in the greatest depth. 



Compressed; dorsal and ventral profiles about equally curved, the depth in- 

 creasing rapidly to the origin of dorsal and tapering to the slender caudal peduncle; 

 preventral area flat, with well marked lateral angles, with a perfect median series 

 of eleven to thirteen scales, or but one scale disarranged; predorsal area keeled 

 with about nine scales; occipital process pointed, reaching about one-fourth to the 

 dorsal; skull smooth, convex, frontal fontanel a nearly equilateral triangle about 

 one-third as long as the parietal fontanel without the groove; third suborbital 

 leaving naked only a small wedge of the cheek behind its upper angle; postorbitals 

 very thin, leaving this area practically naked; mouth small, maxillary reaching 

 to, or not quite reaching, the vertical from the anterior margin of the eye, about 

 half as long as eye; premaxillary with five or six sub-ovate teeth, each with a 



