526 PROCEEDINGS OF THE ACADEMY OF [Oct., 



mostly inclined inferiorly. Edge of preopercle behind slightly 

 inclined anteriorly. Opercle large and smooth. Upper surface of 

 head smooth, broad parietals without fontanel. 



Gill-opening extends forward slightly before hind eye edge, though 

 not so far as hind pupil edge. Rakers moderate in number, lanceo- 

 late, a little shorter than filaments, and latter about 2| in eye. 

 Isthmus broad, constricted in front, and surface convex. Branchios- 

 tegals large, subequal. 



Scales large, well exposed, of nearly uniform size, striae not evident, 

 and arranged in even longitudinal series. No scales on fins except 

 a few on caudal base. No 1. 1., and no axillary scaly flaps. 



Dorsal inserted slightly nearer caudal base than snout tip, first 

 ])ranched ray longest, and depressed fin extends 2j to caudal base. 

 Adipose fin small, inserted near last third in space between last 

 branched dorsal ray base and caudal ba§e, its length about 2f in eye. 

 Anal inserted well behind dorsal base, first branched ray longest, 

 and depressed fin extending slightly less than half way to caudal 

 base. Caudal moderate, well forked, with equal pointed lobes. 

 Pectoral low, upper rays longest, and fin extends about If to ventral. 

 Ventral origin a little before dorsal or about midway between pec- 

 toral and anal origins, fin large and reaches anal. Vent close before 

 anal. 



Color in alcohol largely brownish on back and upper surface of 

 body. Lower surface of body silvery-white, and this color strongly 

 contrasted with color of back by blackish lengthwise streak or band 

 extending from snout and mandible tips, through eyes, along side 

 a little low to inferior median caudal rays. Through most of its 

 course blackish lateral band defines middle of side by its upper bound- 

 ary. At base of last anal ray it continues out on distal portion of 

 same in contrast with rest of fin, and also covers good portion of 

 lower caudal peduncle side. Upper side of back with dusky streak 

 extending from posterior supraorbital region to bases of uppermost 

 l^ranched caudal rays, and its width much narrower than lower band. 

 Sloping obliquely "from just before dorsal origin toward basal region 

 of pectoral, a broad area of minute dusky clots. Above anal base 

 another similar area vertically from back to lower dark band, though 

 not extending below. Fins all pale or grayish to whitish, dorsal 

 slightly dusky toward apex. Iris slaty. 



Length 25 mm. 



Type, No. 39,189, A. N. S. P. Madeira River, about 200 miles 

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

 Smith. 



