1913.] NATURAL SCIENCES OF PHILADELPHIA. 557 



base, first branched ray longest, and fin extends back If to caudal 

 base. Adipose fin elongate, its base over last anal ray bases. Anal 

 well anterior, inserted little behind dorsal origin, anterior rays 

 elevated with first branched longest, though not forming distinct 

 lobe, rays being graduated down behind with straight edge. Caudal 

 longer than head, well eraarginated or forked, and pointed lobes 

 about equal. Pectoral long, pointed, low, upper rays longest, and 

 depressed fin extends back about f to anal origin. Ventral inserted 

 about last f in space between pectoral and anal origins, and extends 

 back a little beyond front of anal. Vent close before anal. 



Color in alcohol pale brownish generally. Back and sides sprinkled 

 with numerous dusky dots, these also extend over anal basally, and 

 over most of caudal. Area above 1. 1. to about seventh scale of its 

 course pale or not dusted with dark dots, except on third and fourth 

 scales a vertical streak equal to vertical eye-diameter extends upward 

 slightly inclined posteriorly, and this streak made up of dark larger 

 dots. Head brownish above, sides, muzzle, and below paler or 

 whitish. Iris slaty. Except as noted above, fins pale. Median 

 streak of dull brownish dots down back. Pale lateral vertebral line 

 of dark dots begins on dotted part of side and continues to caudal 

 base, where evidence of faded or pale dusky blotch medianly. 



Length 31 mm. 



Type, No. 39,292, A. N. S. P. IMadeira River, about 200 miles 

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

 Smith. 



Only the type known. Brijconamericus alburnus (Hensel) differs 

 in the smaller head (4f), though agrees in the absence of maxillary 

 teeth, scales, etc. 



(Jacunda, the native name.) 

 Bryconamericus smithi sp. nov. Fig. 18. 



Head 4; depth 2|; D. ii, 7; A. iii, 25, i; P. i, 10; V. i, 7; 37 

 scales in 1. 1. to caudal base and 2 more on latter; 6 scales above 

 1. 1.; 4 scales below 1. 1. to ventral origin; 5 scales below 1. 1. to anal 

 origin; 14 predorsal scales; head width 1| its length; head depth 

 at occiput liV; snout 3h; eye 2f; maxillary 2; interorbital 2|; 

 first branched dorsal ray 1; least depth of caudal peduncle 2|; first 

 branched anal ray 1|; pectoral 1|; ventral 1|. 



Body moderately long, of ovoid contour with lower profile a little 

 more convex anteriorly, greatest depth at dorsal origin and edges all 

 convexly rounded, except trenchant post ventral. Caudal peduncle 

 compressed, about long as deep. 



