THE CATFISHES OF VENEZUELA — SCHULTZ 195 



Detailed measurements of three specimens were made, and these 

 data are expressed in hundredths of the standard length and recorded 

 below. Standard length (in mm.) 188; 101; 277. 



Length of head to tip of supraoccipital 28.5; 28.2; 29.2; length of 

 head to end of operculum 27.7; 28.2; 27.8; greatest depth of body 

 19.1; 18.3; 18.4; width of head at base of pectorals 20.5; 20.3; 21.8; 

 length of snout 10.7; 11.7; 11.9; diameter of eye 3.62; 5.15; 3.72; 

 width of fleshy interorbital space 11.3; 9.70; 12.1; length of maxillary 

 barbel 86.7; 94.1; 68.6; length of outer mental barbel 31.9; 36.6; 

 27.8; length of inner mental barbel 22.3; 23.6; 20.4; total length of 

 adipose fin 38.6; 40.6; 37.2; height of adipose fin 6.70; 6.83; 4.94; 

 length of base of anal fin 13.2; 14.4; 12.4; least depth of caudal peduncle 

 10.2; 11.4; 9.40; length of caudal peduncle 19.2; 19.8; 20.6; distance 

 between anterior and posterior nasal openings 3.62; 3.56; 3.72; dis- 

 tance from eye to posterior nasal opening 5.58; 5.15; 5.56; distance 

 from tip of snout to origin of dorsal fin 34.3; 34.4; 35.7; snout to origin 

 of anal fin 68.4; 68.8; 72.2; snout to adipose origin 54.0; 54.1; 58.4; 

 snout to pectoral insertion 24.7; 24.0; 24.8; snout to pelvic insertion 

 47.0; 48.7; 50.2; anus to anal origin 15.2; 12.0; 14.8; length of dorsal 

 spme 12.0; 13.1; 11.3; length of pectoral spine 13.1; 14.9; 13.8; length 

 of longest (third branched) ray of anal fin 12.5; 14.6; 12.3; length of 

 longest ray of pelvic fins 13.8; 16.3; 14.7; snout to anus 54.8; 57.8 

 58.2; length of longest ray of upper lobe of caudal fin 22.5; 27.3; 21.5 

 length of longest ray of lower lobe of caudal fin 22.6; 28.6; 21.7 

 postorbital length of head to end of operculum 14.1; 12.7; 13.9 

 width of head across rictus of mouth 14.5; 15.1; 16.2; tip of chin 

 to base of inner mental barbel 4.63; 4.85; 4.62; tip of chin to base of 

 outer mental barbel 5.58; 6.44; 6.35. 



The following counts were made, respectively: Dorsal rays I, 6; 

 I, 6; I, 6; anal vi, 8; v, 9; vi, 8; pectoral I, 9; I, 10; I, 9; pelvics always 

 i, 5; branched caudal rays 7+9; 7 + 9; 7 + 9; gill rakers on first gill 

 arch — ; 4 + 8; 4 + 10. Head depressed anteriorly, snout roimded 

 and broad, the distance across the mouth at angles iKo in the head 

 to end of operculum; width of head at base of pectorals lYs to IK in 

 head; adipose fin about 2% to 2% in standard length; height of 

 adipose fin 1% in interorbital space and 6 or 7 times in its total length; 

 lower jaw a little shorter than upper jaw; all teeth similar, villiform, 

 and in a band (with lateral ends rounded) on premaxillaries and on 

 dentaries; gill membranes extending forward, free from the isthmus, 

 in front of which is a pouch; dorsal and pectoral fins each with a 

 sharp, stiff spine; posterior edge of pectoral spines serrated, anterior 

 edge rough basally, with serrations dis tally but pointing basally; 

 dorsal spine smooth ; eye with a free margin ; interorbital space nearly 

 flat, a trifle convex; all barbels blackish; mental barbels all in a nearly 



