142 THE AMERICAN CHARACIDAE. 
Number of Length 
Catalogue number specimens in mm. Locality Collector 
1443 C., 11901 T. 7 32-52 Isoro Mud Creek Shideler 
1444 C., 11902 I. 26 26-53 Mud flats in Demerara River Eigenmann 
below Wismar 
1445 C. ] 37 Georgetown Trenches Eigenmann 
1446 C., 11903 I. q 4147 Wismar Eigenmann 
1447 C., 11904 I. 5 35-47 Cumaka, Demerara River Eigenmann 
3043 C. 24 27-48 Bragan¢a Haseman 
3044 C. 9 31-38 Maciél, Rio Guaporé Haseman 
Head 3.75; depth 2.2-3; D. 11; A. 23 to 27; scales 5-32 to 34-3 to 
4.5; eye 2.25 to 2.5 in the head; interorbital narrower than the eye, 3 in the 
head. 
Compressed, deepest at the vertical of the first dorsal ray; depth of head 
at base of occipital process three fifths in the greatest depth. Preventral regions 
rounded, without complete series of median scales. Predorsal region rounded 
without a regular series of median scales. 
Occipital process 6 in the distance from its base to the dorsal, bordered 
by 2.5 to 3 scales. Interorbital almost flat. Frontal fontanel very narrowly 
triangular, two thirds the length of the parietal without the occipital groove. 
Second suborbital leaving a narrow naked margin below it. Mouth moderately 
large; maxillary equal to the eye; mandible a little longer, half the length of 
the head. Premaxillary with two to four conical or tricuspid teeth in the outer 
row and five or six, tricuspid teeth in the inner row. Maxillary with six small 
conical and tricuspid teeth. Dentary with a graduated series of five, 3- to 
5-pointed teeth and a series of twelve or more minute conical ones on the sides. 
Gill-rakers 6 + 10. 
Basal third of caudal scaled. Anal sheath rudimentary or wanting. Lat- 
eral line with pores on 5 to 8 scales. 
Origin of the dorsal equidistant from the snout and caudal, its penultimate 
ray one third of the longest which is 3.25 in the length. Origin of the anal 
on the vertical from the first scale behind the dorsal. Anal deeply emarginate. 
Ventrals on the vertical from the first scale in front of the dorsal. Ventrals 
overlapping the anal a distance equal to half the length of the eye. Pectorals 
overlapping ventrals the same distance. 
Dorsal black except the tips of the anterior 5 or 6 rays. An oblique black 
line on the anal from the base of the first to the tips of the fourth and fifth rays. 
Humeral spot vertically elongate, often faint and sometimes lacking. No 
caudal spot. Lateral stripe narrow. Scales of the back outlined with dusky. 
