238 PROCEEDINGS OF THE ACADEMY OF [Apr., 



edge inclined forward. Opercle moderately large, with a few radi- 

 ating striae on its lower edge. 



Gill-openings lateral, extend forward about opposite hind pre- 

 opercle edge. Gill-rakers about 11+9 points, about 3 in gill- 

 filaments, and latter 1| in eye. Isthmus Inroad. Branchiostegals 

 large, subequal. 



Scales large, well exposed in longitudinal series parallel with 1. 1., 

 more or less uniform in size, though a little smaller on breast and 

 caudal base* Scales ensheath bases of dorsal and anal, though not 

 extending on the fins. Ventral with free pointed axillary scale 

 trifle less than half length of fin. Lateral line complete, midway 

 along side, extends on caudal base, and formed of simple tubes 

 extending well over scales. 



Dorsal origin a little nearer hind edge of adipose fin than snout 

 tip, first branched ray longest, and depressed fin extends 5 to caudal 

 base. Anal inserted well behind depressed dorsal, first branched 

 ray longest and reaches caudal base. Caudal well forked, pointed 

 lobes equal. Adipose fin about | of eye, inserted about midway 

 between caudal base and hind edge of depressed dorsal fin. Pectoral 

 small, low, extends i to ventral origin. Ventral inserted behind 

 second branched dorsal ray base, fin extending trifle more than half 

 way to anal origin. Vent at last third in space between depressed 

 ventral tips and anal origin. 



Color in alcohol largely pale uniform brownish above, below, or 

 on belly and abdomen, paler and whitish. Head brownish above, 

 sides and below paler. Lips pale. Iris slaty. Trunk with nine 

 dusky to blackish transverse cross bands, of which first or that just 

 after occiput, fourth or that below dorsal, seventh or that just before 

 adipose fin, and last at caudal base, broader or much more expanded 

 than others. Second intermediate, also fifth intermediate transverse 

 streaks entirely dorsal and only extend down each side half Avay to 

 lateral line. Fins all pale or uniform, dorsal and caudal slightly 

 darker, and adipose fin with a little grayish. 



Length 120 mm. 



Type, No. 39,320, A. N. S. P. Rupununi River, British Guiana. 

 J. Ogilvie. ' 



Nos. 39,321 to 39,323, paratypes, same data. Head 3| to 3f ; 

 depth 4 to 4j; D. in, 10, i; A. in, 8, i; scales 36 or 37 in 1. 1, to 

 caudal base and 3 or 4 more on latter; 6 scales above 1. 1.; 5 scales 

 below 1. 1.; 13 predorsal scales; snout 2| to 2h in head; eye 4 to 4|; 

 maxillary 4\ to 4f; interorbital 3; length 75 to 82 mm. These 



