1913.] NATURAL SCIENCES OF PHILADELPHIA. 527 



Also, Nos. 39,190 to 39,192, A. N. S. P., paratypes. From tribu- 

 tary of the Madeira River near Porto Velho, Brazil. January - 

 February, 1913. Edgar A. Smith. Head 3^ to 3f ; depth 4| to 4f ; 

 D. II, 8 or II, 9; A. ii, 8 or ii, 9; scales in median lateral series from 

 shoulder to caudal base 24 or 25 and usually 1 or 2 more on latter; 

 6 or 7 scales transversely between dorsal and ventral origins; 10 

 predorsal scales; snout 3^ to 3| in head; eye 2f to 3; mouth width 

 4i to 4|; interorbital 2f to 3; length 21 to 26 mm. 



This species is related to Poecilobrijcon harrisoni Eigenmann, but 

 differs in the presence of a dark dorso-lateral lengthwise streak, and 

 in the same way P. erythrurus Eigenmann and P. trifasciatus (Stein- 

 dachner) will also be found to differ. 



(^fs", two; ypai'i'^i, line; with reference to the two dark lengthwise 

 streaks.) 



APHYOCH ARACIN^. 

 Odontostilbe madeirae sp. nov. Fig. 0. 



Head 3|; depth 2|; D. iii, 9; A. iii, 20, i; P. i, 11; V. i, 7; 

 scales 35 in 1. 1. to caudal base and 2 more on latter; 6 scales above 

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

 below 1. 1. to anal origin; 11 predorsal scales; head width 2 in its 

 length; head depth at occiput Ii; snout 4; eye 3|; maxillary 3|; 

 interorbital 3; first branched dorsal ray 1; first branched anal ray 

 1|; least depth of caudal peduncle 2|; upper caudal lobe 1; pectoral 

 \\; ventral If. 



Body moderately elongate, compressed, greatest depth at dorsal 

 origin, contour elongately ovoid, edges all convexly rounded with 

 slight median keel just before dorsal or extending nearly for last 

 half in predorsal area. Caudal peduncle compressed, and least 

 depth slightly less than its length. 



Head moderate, compressed, with similar profiles, and flattened 

 sides scarcely constricted below. Snout convex over surface and in 

 profile, length | its width. Eye large, rounded or but slightly 

 ellipsoid, its centre near first f in head. Pupil large. Eyelids free, 

 not adipose-like. Mouth broadly terminal, commissure short, and 

 jaws rather thin. Lips thin, little developed. Maxillary free, 

 oblique, reaches back opposite front edge of eye. Teeth uniserial 

 in jaws, well compressed, broad, edges of each with seven denticles, 

 of which median largest. Maxillary with two well-developed 

 similar teeth. Mandible rather broad, shallow, and rami slightly 

 elevated in mouth. Tongue broad, depressed, smooth, rounded and 



