1914.] NATURAL SCIENCES OF PHILADELPHIA. 241 



and disposed in longitudinal series parallel with 1. 1. Scaly sheaths 

 at dorsal and anal bases low, allowing movements of fins, though 

 not extending on their surfaces. Ventral with free pointed axillary 

 scaly flap, nearly 3 in length of fin. L. 1. complete, nearly straight, 

 and tubes simple, extending well over first half in scale exposures. 



Dorsal origin midway between snout tip and hind basal edge of 

 adipose fin, first l)ranched ray longest or extends back well beyond 

 tips of last, and fin reaches but trifle less than half way to caudal 

 base. Adipose fin inserted little nearer depressed dorsal tip than 

 caudal base, and length about equals eye. Anal inserted trifle 

 before adipose fin, first branched ray longest, and fin reaches trifle 

 beyond caudal base. Caudal large, well forked, broad pointed lobes 

 about equal. Pectoral low, pointed, reaches about | to ventral. 

 Latter inserted behind first branched dorsal ray base, fin large, and 

 reaches If to anal origin. Vent nearly at first third in space lietween 

 depressed ventral and anal origin. 



Color in alcohol generally pale brownish or whitish, marked by 

 ten very conspicuous well-defined slaty-black transverse bars, 

 those on trunk meeting their opposite sides and sloping slightly 

 posteriorly. On head lower surface pale and dark bars reflected 

 slightly across. Lips pale or whitish. Iris slaty. First dark bar 

 includes upper edge of snout, extends down along maxillaries and 

 then across lower surface of mandible posterior to symphyseal 

 papillae, and its width much less than any of the other bars. Second 

 dark bar close behind, and of moderate width, bridges lores over 

 upper surface of snout. Third dark bar extends over interorbitals 

 and also reflected on infraorbital. Fourth dark bar extends from 

 occiput, includes opercles and pectoral root. Fifth dark bar slightly 

 forked above and below, midway in predorsal. Sixth dark bar 

 includes dorsal base anteriorly and ventrals. Seventh dark bar 

 postdorsal and postventral in position. Eighth dark bar wholly 

 before adipose fin, extends to front half of anal. Ninth dark bar 

 includes adipose fin and caudal peduncle. Tenth dark bar includes 

 caudal base. Except for such intrusion as noted, all fins of whitish 

 color generally. 



Length 170 mm. (caudal tips damaged). 



Type, No. 39,324, A. N. S. P. 'llupununi River, British Guiana. 

 J. Ogilvie. 



Nos. 39,325 to 39,327, paratypes, same data. Head 3f to 3f; 

 depth 3f to 4; D. iii, 10, i; A. in, 8, i; scales 33 to 35 in 1. 1. to 

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



