294 PROCEEDINGS OF THE NATIONAL MUSEUM VOL. 95 
U.S.N.M. No. 121399, a specimen 178 mm. in standard length, collected by 
Leonard P. Schultz, G. Zuloaga, Roger Sherman, and William Phelps, Jr., May 
12, 1942, in the Rfo Gudrico and tributaries between San Sebastidn and San 
Casimiro, Estado de Aragua, Venezuela. 
The following counts were made on this specimen: Dorsal rays ii, 
9; anal ili, 22; pectoral i, 13-1, 13; pelvic i, 7-1, 7; scales 73, 13 on 
Sanco to lsvvaral line and 5 or 6 to alike insertion. 
Subfamily CHARACINAE 
There seems to be confusion in regard to the nomenclature and re- 
lationships among certain genera related to Charaz, especially the 
genera Cynopotamus, Cyrtocharaz, Gilbertolus, and Hucynopotamus. 
Some of these have been used indiscriminately for one another. 
Roeboides may be distinguished from this group because it possesses 
external toothlike processes along the front of the upper jaw and 
sometimes also on the lower jaw. 
After an examination of the type species, or the original deseription 
of the genotypes of these genera when actual specimens were not 
available, the following analysis was made. The key is intended to 
indicate some of the characters on which the various genera may be 
separated. ‘The dentition is of the most importance. 
la. No external toothlike processes along front of upper or lower jaws. 
2a. Lower jaw with two series of conical teeth anteriorly, external row with 
enlarged canines, but inner patch composed of small conical teeth in one 
or more rows. 
3a. Two pairs of canines on premaxillaries and 4 or 5 pairs on mandibles; no 
small conical teeth between canines on lower jaw, inner series of small 
conical teeth on mandible confined to front of jaw; an outer row of 
small conical teeth between canines on each premaxillary, a pair of 
larger conical teeth representing inner row between pair of canines on 
each premaxillary; lower jaw included; pectoral shield not notched; 
origin of dorsal in front of anal origin; no keel in front of pelvics, but a 
low one behind pelvic bases to anus; anterior half of upper portion of 
first gill arch without elongate gill rakers, rough plates occurring instead.. 
Cynopotamus Valenciennes 
3b. No canines; two series of short conical teeth on premaxillaries; mandible 
with 2 series of short conical teeth on anterior half, a single series: 
posteriorly; origin of dorsal a little behind anal origin; origin of dorsal 
a trifle closer to snout tip than to midcaudal base; maxillary reaching 
to under front half of pupil; gill rakers about 5+1-+18. 
Eucynopotamus Fowler ” 
2b. Mandible with a single series of teeth, no row or patch of teeth at front of 
lower jaw inside outer series; canines present in both jaws. 
22 Hvermannella Kigenmann, Smithsonian Mise. Coll., vol. 45, p. 146, 1903. (Type, Cynopotamus biserialis: 
Garman.) 
Eucynopotamus Fowler, Proc. Acad. Nat. Sci. Philadelphia, vol. 56, p. 119, 1904 (new name replacing: 
Evermannella Eigenmann preoccupied). (Type, C. biserialis Garman.) 
Evermannolus Eigenmann, in Eigenmann and Ogle, Proc. U. S. Nat. Mus., vol. 33, p. 3, 1907 Mew name: 
replacing Evermannella Eigenmann, preoccupied). (Type, C. biserialis Garman.) 
