234 



PROCEEDINGS OF THE ACADEMY OF 



[Apr., 



1. 1.; 3 scales below 1. 1. to ventral origin; 3 scales below 1. 1. to anal 

 origin; 9 scales before dorsal; head width 2| in its length; head 

 depth at occiput U; snout 4; eye 3f ; maxillary 4|; interorbital 

 41; length of dorsal 1; least depth of caudal peduncle 2|; upper 

 caudal lobe lyV; pectoral 1; ventral 1|. 



Body elongate, slender, moderately compressed, greatest depth 

 at dorsal origin, profiles similar and edges rounded. Caudal peduncle 

 well compressed, least depth about If its length. 



Head attenuated, compressed, flattened sides but scarcely con- 

 verging below, upper profile convex and lower concave. Snout 

 conic, protruding slightly, compressed, long as broad. Eye rounded, 

 little longer than deep, high and slightly anterior. Mouth small, 

 transverse. Teeth small, invested with membrane, conic, simple, 

 pointed. Maxillary small, free, well inclined, reaches midway in 



Fig. 3. — Characidium fasciadorsale Fowler. (Type.) 



space between front and hind nostrils. Tongue depressed, free in 

 front. Mandible shallow in front, and rami well elevated inside 

 mouth. Nostrils well separated, anterior about midway in snout 

 length, and posterior close before front eye edge, both simple pores, 

 Preorbital triangular, length about f of eye. Interorbital broadly 

 convex. Infraorbitals narrow. Opercle moderate, surface smooth, 

 Subopercle extended posteriorly and with broad cutaneous flap. 



Gill-opening extends forward about opposite hind edge of pupil. 

 Gill-rakers about 4 + 10? short weak points, about I length of 

 filaments and latter about 2h in eye. Isthmus moderately broad, 

 Branchiostegals moderate. 



Scales mostly uniform in size, in even longitudinal series parallel 

 with 1. 1., well exposed, and each showing about six horizontal striae 

 on exposures. Ventral axilla with rather short pointed free scaly 



