THE GA.TFISHES OF VEMEZUELA S€HULTZ 



285 



Remarks. — This new species may be distinguished from others 

 referred to the genus Astroblepus by the key to the species prepared 

 for this genus, pages 278-282. 



Named phelpsi in honor of William H. Phelps, of Caracas, who is a 

 well-known leader in furthering the development of the biological 

 sciences in Venezuela. 



Table 13.- — Counts made on two species of Astroblepus 



Family LORICARIIDAE 



KEY TO THE GENERA OF LORICARIIDAE REPORTED FROM VENEZUELA BASED ON 

 SPECIMENS FROM THAT AREA 



la. Ej-es on dorsal surface of head and not at all visible from below; bones of 



pectoral arch not exposed that connect across ventral side of body between 



pectoral fin bases. 



2a. Caudal peduncle not greatly depressed and elongate, but if present rounded 



or triangular or compressed; adipose fin represented by a spine; no notch 



in posterior part of orbit; snout not greatly produced or pointed; plates 



in lower lateral series 30 or fewer. 



3a. Width of ramus of lower jaw contained fewer than 1% times in interor- 



bital space, usually the two being nearly equal in length and width; 



belly naked; teeth, bilobed, very numerous, about 100 to 150 on each 



ramus of jaw; dorsal origin a little in advance of a vertical line through 



insertion of pelvics; dorsal rays I, 7 to I, 9; anal I, 2 to I, 5; plates 



along lower sides 23 to 27. 



4o. At least one-fourth of anterior dorsal surface of snout naked and 



without barbels; iuteropercle and opercle separately movable, 



former with short evertible spines, sometimes with curved or hooked 



tips Chaetostoma Meckel 



4fc. Snout bony to its tip; interopercle and opercle separately movable, 

 former with graduated elongate, hooked spines not arranged in a 



rosette, but evertible Pseudancistrus Bleeker 



36. Width of ramus of lower jaw contained more than 1% times in inter- 

 orbital space, usually 2 to 5 times. 

 5a. Dorsal rays I, 10 to 15; anal I, 3 or I, 4; interopercle and opercle 

 moderately but not independently movable, former sometimes with 

 spines or with spines rudimentary; dorsal origin in front of the 

 pelvic insertion; plates keeled; teeth numerous, bilobed. 



Pterygoplichthys Gill 

 56. Dorsal rays I, 6 to I, 8 (usually I, 7) ; anal I, 3 to I, 5. 



633749 — 43- 



