THE CATFISHES OF VENEZU(EiLA SCHULTZ 



221 



Length of head to end of operculum 28.7; width of head across 

 base of pectorals 19.9; greatest depth of body 19.9; length of snout 

 12.1; diameter of eye 4.56; distance from eye to rim of posterior nostril 

 2.28; distance between anterior and posterior nostrils 4.89; width of 

 interorbital space 9.45; postorbital length of head 14.3; total length 

 of adipose fin 22.2; greatest height of adipose fin 7.50; least depth of 

 caudal peduncle 10.4; length of caudal peduncle from base of anal to 

 midbase of caudal fin 22.2; length of first ray of dorsal fin 27.4; length 

 of first ray of pectoral 22.8; longest branched ray of pelvic fin 17.9; 

 longest branched ray of anal fin 18.9; length of longest ray of upper 

 lobe of caudal fin 32.2; longest ray of lower lobe of caudal fin 31.9; 

 length of shortest rays of caudal fin 12.7; distance from snout to 

 dorsal origin 40.0; snout to anal origin 67.1; snout to adipose origin 

 68.4; snout to pelvic insertion 45.6; snout to pectoral insertion 23.1; 

 dorsal origin to adipose origin 31.3; anus to anal origin 10.1; length of 

 maxillary barbel 40.9; length of outer mental barbel 22.8; length of 

 inner mental barbel 13.4; length of base of anal 13.0. 



The following counts were made: Dorsal rays i, 6; anal iv, 7; pectoral 

 i, 8-i, 8; pelvic i, 5-i, 5; branched rays of caudal fin 15. 



First rays of pectoral and dorsal not spines but segmented rays; 

 margin of eyes not free; gill membranes extending far forward, free 

 from isthmus, not joined to each other; a pair of maxillary barbels in 

 a groove to below eye and extending to opposite tips of pectorals; 

 two pair of mental barbels, the outer pair reaching a little behind base 

 of pectorals, the inner pair not quite reaching to opposite pectoral 

 insertion; origin of anal a trifle in advance or under origin of adipose 

 fin; pelvics inserted under fourth branched ray dorsal fin; caudal fin 

 deeplj^ forked, lobes about equal; nasal openings far apart, the posterior 

 ones near eyes, funnel-shaped, the anterior nasal openings direct^ in 

 front of the posterior ones and tubulnr; snout projecting, lower jaw 



533749—43 4 



