554 PROCEEDINGS OF THE ACADEMY OF [Oct., 



6 + 16, slender, lanceolate, much less than filaments, and latter 

 about f of eye. Isthmus narrowly constricted in front, broad 

 behind, and surface convex. Branchiostegals moderate, subequal. 



Scales moderate, well exposed in longitudinal series parallel with 

 1, 1., each with a few radiating strise, and of mostly uniform size. 

 Caudal covered with a number of small scales over greater basal 

 portion. Scales large along anterior base of dorsal and form sheath, 

 and similar ones on anal. Ventral with free pointed axillary scaly 

 flap, its length nearly | that of fin. L. 1. complete, slightly decurved 

 till about f in greatest body depth, and extends a little low along 

 side of caudal peduncle to median caudal base. Tubes simple, 

 moderately exposed anteriorly. 



Dorsal origin about midway between snout tip and hind edge of 

 adipose fin, first branched ray longest, and depressed fin reaches 

 2j to caudal base. Adipose fin placed over last anal rays basally, 

 or about last | in space between dorsal origin and caudal base, fin 

 about equals eye. Anal inserted close after dorsal base, first 

 branched ray longest, though with other anterior anal rays not 

 forming distinct lobe. Caudal well forked, lobes longer than head, 

 broad, pointed, equal, and rudimentary rays well developed. Pec- 

 toral low, rounded, upper rays longest and extend | to ventral origin. 

 Ventral inserted slightly behind dorsal origin, and extends back to 

 anal origin. Vent about last f in postventral space. 



Color in alcohol very pale brownish generally. Edges of scales 

 on back dotted with brownish, though no median dark streak. 

 Upper surface of head brownish, sides, muzzle, and lower surface 

 whitish. Iris slaty. Above third scale of 1. 1. vertical dusky humeral 

 blotch, its vertical diameter about equal to pupil. Evidently a 

 silvery lateral streak, narrow, and best defined posteriorly. A narrow 

 dark underlaid streak, made up of dusky dots, vertebral along side 

 of body, begins opposite tip of depressed pectoral and extends to 

 median caudal base, and most distinct in median part of its course. 

 Slight dusky spot at bases of median caudal rays, and lower lobe 

 sprinkled with minute dusky dots. Upper or apical portion of 

 dorsal sprinkled with dusky dots. Fins, otherwise than noted 

 above, pale or whitish. 



Length 42 mm. 



Type, No. 39,290, A. N. S. P. Madeira River, about 200 miles 

 east of Long. W. 62° 20', Brazil. September, 1912. Edgar A. 

 Smith. 



Also No. 39,291, A. N. S. P., paratype, same data. Head 3^; 



