244 PROCEE.DINGS OF THE NATIONAL MUSEUM vol.94 



head through eyes; 6 barbels, 4 mental and 2 maxillary; dorsal i, 4 or i, 5; 

 anal ii, 5 or ii, 6; platelets in lateral line 33 to 39. (Fig. 4, b.) 



Dupouyichthys sapito, new genus and species 



16. Five or six plates between anus and origin of anal fin; a barbel at each corner 



of gape of mouth near base of maxillary barbel; dorsal i, 6; anal usually 



iii, 4; 4 short papillae on upper lip; 4 mental and 2 maxillary barbels; no 



black streak across e3'es; platelets in lateral line 50. 



2a. Four black saddles dorsally, the last one on base of caudal fin rays and 



next to last at posterior end of caudal peduncle, separated by a narrow 



pale interspace; black area of dorsal fin with concave dorsal margin and 



the black is restricted to basal part of fin. (Fig. 4, a.) 



Hoplomyzcn atrizona petrcleus, new subspecies 

 26. Three black saddles dorsally, the last one extending on basal portion of 

 caudal fin rays; black blotch on dorsal fin with convex dorsal or distal 

 margin and occupying anterior two-thirds of fin. (Fig. 4, a.) 



Hoplomyzon atrizona atrizona Myers 



DUPOUYICHTHYS, new genus 



This new bunocephalid catfish genus from the Motat^n system, 

 Maracaibo Basin, is related to Hoplomyzon Mj^ers. It differs in hav- 

 ing but three plates in front of the anal origin instead of five or sLx, in 

 lacking a barbel at front corners of mouth, and the absence of four 

 papillae on the upper lip; in addition, the fleshy tips of the spiny 

 pelvic fin rays are exserted. 



This genus has a depressed head and hexagonally shaped body 

 posteriorly, the under surface on the same general plane; a bony 

 protuberance at rear of supraoccipital, followed by tv/o or more be- 

 tween this one and origin of dorsal; a line passing through insertion 

 of pelvics is about a third closer to origin of dorsal than to insertion 

 of the pectoral fin; greatest depth of body at origin of dorsal and 

 greatest width of body at bases of pectoral fins; body armed by a 

 dorsal and a ventral series of plates and a series of tiny platelets along 

 the lateral line; these plates are essentially the same as in H. atrizona; 

 skin everywhere finely papillate; upper lip without the four papillae 

 found in the other related species; lower lip thin, not papillate; nos- 

 trils widely separated, the anterior one tubular; anus a trifle closer to 

 tip of snout than end of depressed anal fin and about a snout's length 

 in front of the origin of the anal fin; snout broadly rounded, with a 

 median depression; interorbital a little concave, the supraorbital rims 

 elevated anteriorly; sLx barbels, two pairs of mental barbels and a 

 maxillary pair, the latter connecting with the side of the head in front 

 of the orbits by a membrane; maxillary barbels extend to front of 

 base of coracoid process; pectoral spine armed on its inner side with 

 five or six spines; pelvic spine with exserted tip, the first soft ray about 

 a third longer than the spine; a membrane connects the tip of the 

 last soft dorsal ray with the back; but the membrane connecting the 

 last ray of anal with the body does not extend quite to the tip of the 



