1906.] NATURAL SCIENCES OF PHILADELPHIA. 297 



Curimatella alburnus (MuUer and Troschel). 



Head 3|; depth 2^; D. iii, 9, i; A. iii, 9, i; scales 33 in lateral line to 

 base of caudal, and 2 or 3 more on latter; 6 scales obliquely back from 

 origin of dorsal to lateral line ; 5 scales between lateral line and origin 

 of ventral; 5 scales between lateral line and origin of anal; snout 3f 

 in head; eye 3^; maxillary 3; interorbital space 2^; pectoral 1|; ventral 

 IjQ. Caudal peduncle deep, compressed, and length about i of least 

 depth. Upper profile convex from occiput to dorsal, and keel only a little 

 distinct just before dorsal, also an indistinct keel on each side. Post- 

 dorsal region rounded, with a median and a lateral keel on each side, 

 all indistinct. Same also continued behind adipose dorsal. Post- 

 ventral region with distinct median keel and a rather indistinct keel 

 on each side converging toward anal. Snout convex, both surface 

 and profile, and upper profile of head straight. Rakers small or 

 minute weak filaments (mostly damaged). Origin of dorsal falling 

 in vertical about midway between tip of snout and posterior basal 

 margin of adipose fin. Third simple dorsal ray longest, longer than 

 head, or about ^ of head and trunk. First branched anal ray appa- 

 rently longest. If in head. Pectoral reaching | of space to ventral. 

 Ventral extending f of space to anal. Length (with damaged caudal) 

 5h inches. A single example, most likely from Dr. Hering's collection, 

 and taken in Surinam?, rather than "Curimatus spec, indet." Cope, 

 Proc. Amcr. Philos. Soc. Phila., XI, 1869-70 (August 19, 1870), p. 566, 

 from Pebas, Hauxwell Coll. 



CYPHOCHARAX subgen. nov. 

 Type Curimatus spilurus Gunther. 



Back well elevated, or hunched, anteriorly. Scales large, in even 

 longitudinal series which slope a little from head posteriorly. 



( A D^o?, gibbous or hunched; /a^al, an old name used by Gronow 

 for the typical genus of this family and first introduced by Scopoli.) 

 Curimata spilura (Gunther). Fig. 4. 



Curimatus spilurus Cope, Proc. Anier. Philos. Soc. Phila., XVII, 1877-78 

 (May 17, 1878), p. 684. Peruvian Amazon. Prof. J. Orton. Coll. of 

 1873. 



Interorbital space 2f in head. Predorsal region trenchant, not 

 grooved, and anterior dorsal profile of body steep. Gill-rakers not 

 evident and scales not serrate. The example figured most likely from 

 Nauta. Also three others which do not vary except that the hump, or 

 elevated back, seems to be a little less in height than in the smaller 

 ones. This agrees fairly well with Dr. Giinther's account, though the 



