246 PROCEEDINGS OF THE NATIONAL MUSEUM VOL. 95 
44b, Base of caudal fin “naked,” without 
enlarged scales and without a dermal 
sac developed, scales of body ending 
near base of caudal fin as is usual on 
many species of fishes. 
Odontostilbe Cope (p. 318) 
43D. i Teeth on premaxillary and on dentary not 
of same shape (fig. 438) but usually 
5-pointed, the two outer points minute 
and located at lower sides of next 
inner point of tooth; maxillary with 
teeth; caudal fin with scales only at 
base and none enlarged, no dermal sac 
on lower lobe of caudal fin. 
Cheirodontops, new genus (p. 319) 
366. Premaxillary with 2 or 3 rows of teeth, dentary 
'. with 1 row. 
45a. Origin of dorsal fin considerably behind middle 
of body and considerably behind a vertical 
line through anal origin; lower caudal fin rays 
or fulcra of males free, forming a peculiar spur; 
caudal fin base without glandular scales; 
second suborbital covering cheek; 5 teeth in 
inner row of premaxillary; anal branched rays 
25 to 32; middle rays of caudal fin usually 
blackish; mouth oblique, lower jaw, when 
closed, in front of tip of snout; lateral line 
decurved anteriorly; sheath of scales along 
anal fin base not quite complete, last few 
lacking. Gephyrocharax Higenmann (p. 322) 
45b. Origin of dorsal fin in front of that of anal; lower 
caudal rays of males not free from other 
caudal fin rays. 
46a. Scales ctenoid with age and always ctenoid 
on prepelvic area; lateral line complete, a 
long tube extending out on base of middle 
caudal membrane, caudal fin base naked; 
4, rarely 5, teeth in front row of premaxil- 
lary and 5 teeth in inner row, all teeth 3- to 
5-pointed; anal rays 38 to 49. 
Ctenobrycon Higenmann (p. 326) 
46b. Scales not ctenoid even on prepelvic area. 
47a. Premaxillary teeth in 3 rows or if in 2 rows 
the teeth very irregular, with at least 2 
teeth on each side out of line with the 
others; teeth tricuspid; lower jaw in- 
cluded, oblique; dorsal origin nearer 
snout by eye diameter than caudal base, 
and nearly over pelvic insertion; branched 
anal rays 8 to 12; caudal fin base naked. 
48a. Lateral line incomplete, with only 9 or 10 
pores just behind head; teeth arranged 
as in figure 46. 
Creagrutops, new genus (p. 327) 
