THE CATFTSHES OF VEISTEZUELA — SCHULTZ 261 



Length of head to end of operculum 18.4 (21.5); width of head to 

 base of pectorals 14.4 (16.9); greatest depth 18.0 (16.5); length of 

 snout 8.17 (8.77); diameter of eye 2.53 (3.29) ; width of fleshy inter- 

 orbital 5.92 (6.59); postorbital length of head 9.16 (9.87); length of 

 longest (first branched) ray of anal fin 11.5 (13.2); length of longest 

 dorsal ray 14.5 (15.4); length of longest pelvic ray 9.43 (10.5); length 

 of first (upper) ray of pectoral 18.3 (18.6); least depth of caudal 

 peduncle 13.4 (12.9); length of caudal peduncle 20.4 (20.0); length of 

 longest ray of caudal fin 18.4 (20.4); distance from tip of snout to 

 origin of dorsal 63.0 (65.8); snout to anal origin 73.4 (73.7); snout to 

 pelvic insertion 58.0 (57.2) ; snout to anus 65.9 (66.9) ; distance from 

 pelvic insertion to anal origin 18.2 (17.5); length of maxillary barbel 

 18.3 (21.9); length of lower maxillary barbel 13.4 (15.1); length of 

 nasal barbel 18.4 (20.0); distance from eye to rim of posterior nostril 

 2.96 (2.85); distance from tip of prolonged upper pectoral ray to 

 pelvic insertion 21.8 (21.1); length of prolonged tip of upper pectoral 

 ray beyond branched rays of pectoral 6.34 (4.17). Caudal fin truncate 

 or a trifle concave; other fins rounded; barbels as in P. emanueli 

 emanueli. 



The following coimts were made: Dorsal always v, 6; anal always 

 V, 4; pelvic always i, 4; branched caudal rays 11 ; pectoral rays i, 8 — i, 

 8 (i, 8 — i, 8); gill rakers about 2 + 5 to 7, rather rudimentary. 



The shape and proportions of the body are the same as in Pygidium 

 emanueli emanueli from the Rio Chama system. 



Color. — No black band along middorsal line of back; belly pale, 

 yellowish in alcohol. The black band along midsides is most dis- 

 tinct, bordered above and below by a pale band ; above the upper pale 

 band is another blackish band extending from nostrils through eye 

 backward to opposite dorsal fin, fading porsteriorly ; below the lower 

 pale band is a third darkish band made up of more or less diffuse spots 

 that run together, this band begins in axil of pectoral fin and passes 

 above base of pel vies, then fading posteriorly; all fins a little grayish; 

 peritoneum pale. 



Remarks. — ^This subspecies differs from P. emariueli emanueli in 

 lacking the black streak anteriorly along the middorsal line and in the 

 presence of a dark streak on lower lateral sides. 



Named motatanensis after the river system in which it was collected. 



PYGIDIUM KNERn (Steindachner) 



Tricho?nycterus knerii Steindachnee, Sitzb. Akad. Wiss. Wien, vol. 86, p. 81, 

 pi. 5, fig. ], la^ 1882 (Canelos). 



U.S.N. M. No. 121235, 9 specimens, 29 to 160 mm. in standard length, collect- 

 ed March 31, 1942, bj^ Leonard P. Schultz, in the Efo Torbes, 1 km. above Tdriba, 

 Orinoco system. The three smallest specimens in this lot have a distinct black 

 streak along midsides; on a specimen about 71 mm. in length, this black streak is 

 barely visible, while on larger sizes the sides are plain brownish in alcohol. 



