THE CATFISHES OF VENEZUELA — SCHULTZ 



237 



standard length, taken along with the holotype and bearing the same 

 data. These types were taken in about 18 feet of water, the bottom 

 very muddy and with much vegetable debris. 



Description. — Based on the holotype and four paratypes. Detailed 

 measurements were made on the holotype and two paratypes, and 

 these data are recorded in table 8. 



The following counts were made, respectively, for holotype, then 

 paratypes: Dorsal rays I, 6; I, 6; I, 6; I, 6; anal iii, 25; iii, 25; iii, 

 24; iii, 25; iii, 23; pectoral I, 7-1, 7; I, 8; I, 7-1, 7; I, 7-1, 7; I, 

 7-1, 7; pelvic i, 5; i, 5; i, 5; i, 5; i, 5; branched caudal rays on three 

 paratypes counted were 15; a paratype had 2-1-7 gill rakers on first 

 gill arch. 



Table 8. — Measurements, expressed in hundredths of the standard length, for two 

 subspecies of Trachycorystes insignis 



Characters 



Standard length (in mm.) 



Length of head to end of operculum 



Greatest depth _ 



Length of snout . 



D iameter ofcye 



Interorbital width _ 



Anterior to posterior nostrils. 



Distance from eye to anterior nostril. 



Width of mouth across its outer angles. ._ .-. 



Width of head across base of pectorals -_ 



Length of maxillary barbel 



Length of anterior mental barbel; 



Length of posterior mental barbel 



Least depth of caudal peduncle 



Length of caudal peduncle 



Total length of adipose fin _ , 



Length of base of adipose fin 



Length of base of anal fin 



Snout to dorsal origin 



Snout to anal origin.. 



Snout to adipose origin 



Snout to pelvic insertion 



Snout to pectoral insertion 



. Snout to anus , 



Length of dorsal spine , 



Length of pectoral spine 



Longest branched ray of pel vies 



Longest branched ray of pectorals 



Longest branched ray of dorsal 



Longest branched ray of anal 



Longest ray of upper lobe of caudal fin 



Longest ray of lower lobe of caudal fin 



Distance from tip of gill cover to tip of postcleithral 

 process above upper base of pectoral fins .__ 



pdoichthys 



Paratype 

 (cf) 



140 

 27.1 

 26.1 

 10.7 



4.71 

 18.2 



4.36 



6.07 

 15.7 

 25.1 

 40.7 

 11.9 

 23.9 

 10.7 



9.43 

 12.7 



5.72 

 28.6 

 32.0 

 64.3 

 78.0 

 50.2 

 23.9 

 60.7 

 32.9 

 21.4 

 16.4 

 18.6 

 24.0 

 12.1 

 24.0 

 23.4 



7.80 



insigms 



U.S.N.M. 

 No. 79238 

 (from El 

 Banco, 

 Colombia) 

 (9) 



162.5 

 27.7 

 26.5 



9.53 



4.92 

 16.6 



4.61 



5.66 

 14.6 

 23.4 

 34.5 



9.84 

 18.5 

 11.4 

 11.7 

 10.5 



5.54 

 25.8 

 31.4 

 63.8 

 79.4 

 51.0 

 22.5 

 62.1 

 25.6 

 21.6 

 13.8 

 21.2 

 21.8 



8.01 

 23.7 

 22.6 



9.54 



533749—43- 



