048 PROCEEDINGS OF THE NATIONAL MUSEUM VOL. 95 
4.2 in head; interorbital convex, equal to eye, and 3.0 to 3.2 in head; 
dorsal and ventral profiles equal; predorsal and preventral areas 
rounded, normally scaled; supraoccipital process short, about 8 times 
from its tip to dorsal origin; snout bluntly rounded; lower jaw a little 
shorter than upper, outer row of premaxillary teeth usually evident; 
mouth when closed a trifle above lower level of pupil; rear tip of maxil- 
lary reaches to a vertical through front edge of pupil; ventral edge of 
second suborbital in contact with preopercle below; lateral line com- — 
plete, anteriorly decurved; gill rakers short, pointed; teeth all 3- to 5- 
pointed with the middle denticle longest and strongest, except in the 
maxillary teeth, which have their denticles more or less of equal size; 
maxillary teeth as broad as high; anal origin under fourth or fifth from 
last dorsal fin ray; adipose origin a little behind a vertical through 
posterior end of anal fin base; dorsal origin about equidistant between 
snout tip and midcaudal fin base; pelvic insertion much closer to base 
of last anal ray than snout tip, equidistant between base of last anal 
ray and pupil; caudal fin forked; first rays of all fins longest; distal 
margin of anal fin truncate or a little concave, that of other fins a 
little convex; pectorals not reaching pelvic insertions and pelvic fins 
not reaching anal origin; intestine with one main loop and about 6 
pyloric caeca; basal part of caudal fin scaled, the scales extending out 
as far as one-half the length of the lower caudal fin lobe; no pouch 
on caudal fin. 
Coloration.—In alcohol the blackish lateral band is wide, more in- 
tense posteriorly, ending in a more or less blackish caudal spot, but 
the black spot at base of middle caudal fin rays does not extend to the 
tips of the middle rays, ending gradually about halfway out; the dark 
humeral spot is vertically elongate, bordered in front and behind by 
a distinct pale area; peritoneum black; midline of back with a dark 
streak. 
Genus HEMIGRAMMUS Gill 
Hemigrammus Giui, Ann. Lye. Nat. Hist. New York, vol. 6, p. 420, 1858. (Type, 
Poecilurichthys unilineatus Gill.) 
Since I have at hand but one species of this genus from Venezuela, 
I can do no better than copy the information from the various works 
by Eigenmann for the three species reported from Venezuela. 
KEY TO THE SPECIES OF HEMIGRAMMUS AS REPORTED IN THE LITERATURE FROM 
VENEZUELA (AFTER EIGENMANN, 1918) 
la. Dorsal fin with a well-defined black spot; anal with an intense black bar from 
a little in front of the base of the first ray to the tips of fourth and fifth rays; 
humeral spot vertically elongate, often faint and sometimes lacking; second 
suborbital leaving a narrow naked area below; six small, tricuspid and con- 
ical teeth on the maxillary; dorsal rays 11; anal 23 to 27; scales 5—32 to 34— 
ESI rete Ee SARA A AOE cA PR EDN cla Hemigrammus unilineatus (Gill) 
