March, 1913- Fishes from Panama — Meek and Hildebr and. 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 i.o 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 i.i to 1.4 in 

 head, its depth 1.6 to 1.7; caudal fin truncate to slightly rounded. 



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. 



Family LORICARIID^. 



Ancistrus planiceps sp. nov. 



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 

 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 i.i 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 i.o in head; caudal obliquely truncate; depth of 

 caudal peduncle 3.6 to 4.0 in head, its depth in its length 3.1. 



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. 



