Marcu, 1913. FisHes From PANAMA— MEEK AND HILDEBRAND. 79 
Body elongate, compressed; top of head flat; width of head 1.2 to 
1.7 in its length; interorbital 3.6 to 4.5 in head; eye 7.5 to 9.3; snout 
2.2 to 2.5; gill openings extending forward nearly to opposite eye; 
pectorals short, the first ray slightly produced, its length 1.0 to 1.3 in 
head; maxillary barbels reaching to base of pectorals; origin of dorsal 
over or slightly behind tips of ventrals; origin of ventrals midway be- 
__ tween tip of snout and tip of caudal; origin of dorsal in advance of anal, 
its last ray over middle of anal; length of caudal peduncle 1.1 to 1.4 in 
head, its depth 1.6 to 1.7; caudal fin truncate to slightly rounded. 
a Color light olive, a dark band from upper angle of opercle to middle 
of base of caudal, above this a second similar band; back with black 
spots, each about twice diameter of eye; similar spots sometimes on 
___ lower part of sides, these most numerous on the largest specimens; 
_ “occasionally portions of the lateral bands are more or less broken up 
-___ into spots and blotches. 
Tuyra River basin. 
a Family LORICARIID. 
q Ancistrus planiceps sp. nov. 
BS Type No. 7580, F. M. N. H.; length 198 mm.; Rio Tuyra, Boca de 
__Cupe, Panama. 
= Head 2.7 to 2.8; depth 6.2 to 6.6; D. I, 8; A. I, 3; lateral scutes 24 to 
i; 26. 
- Body depressed anteriorly, rounded to compressed posteriorly; 
__width of head 1.2 to 1.3 in its length; depth of head 2.4; eye 7.4 to 8.5; 
_ _ interorbital 2.3 to 2.4; mandibular ramus 6.5 to 8.0; snout 1.6 to 1.8 in 
head; head without ridges, the median portion of the snout elevated; 
sides of snout margined with bristles; interoperculum movable, armed 
with about 28 spines, capable of being everted and nearly concealed 
under edge of operculum, the longest spine 3.5 to 4.2 in head; scutes 
____Spinulose, not carinated; 6 scutes between dorsal and adipose fins, 11 
between anal and caudal; supraoccipital scute bordered by median 
_ scute and 2 lateral ones; lower surface of head and abdomen naked; first 
_ dorsal ray 1.1 to 1.4 in head; base of dorsal 1.7 to 1.8, equalling its 
distance from adipose fin; pectoral spine extending to distal fourth of 
ventral, its length .9 to 1.0 in head; caudal obliquely truncate; depth of 
_ caudal peduncle 3.6 to 4.0 in head, its depth in its length 3.1. 
a Color dark, uniform, fins all spotted with blue to bluish white; 
_ abdomen and under side of head with or without light spots. 
Tuyra River basin. 
