THE CATFISHES OF VENEZUE'LA SCHULTZ 



319 



numerous; all the fins except the caudal with rows of black spots, 

 those on the dorsal membranes in two rows and numbering about 10 

 to 12, in the young but 9; caudal fin plain blackish, anus white; 

 peritoneum more or less dusky. 



Named maracaiboensis in reference to the Maracaibo Basin, where 

 the species was collected. 



Table 21. — Measurements, expressed in hundredths of the standard length, and 

 counts made on four specimens of Hemiancistrus maracaiboensis 



Character 



Paratype Paratype Paratype Holotype 



Standard length (in mm.). .— - 



Total length (in mm.),.. --- -- 



Head— tip of snout to posterior edge temporal plate. . . 



Greatest depth 



Length of snout 



Width of interorbital space 



Diameter of eye 



Postorbital length of head 



Tip of snout to rear of supraoccipital 



Dbtance nostril to eye — 



Length of maxillary barbel 



Length of ramus of lower jaw (bony) 



Width of head at coracoids 



Least depth of caudal peduncle 



Length of caudal peduncle 



Length of dorsal spine 



Length of anal spine 



Length of pectoral spine 



Length of adipose spine 



Length of pelvic spine 



Length of depressed dorsal 



Length of depressed anal 



Distance from snout to origin of dorsal 



Distance from snout to origin oi adipose. 



Distance from snout to origin of anal.. 



Length of longest interopercular spine 



Length of base of dorsal 



Length of longest upper ray of caudal 



Length of longest lower ray of caudal 



Length of shortest middle ray of caudal 



Dorsal rays 



Anairays 



Pelvic rays 



Pectoral rays 



Number of plates in lower lateral series 



Number of plates anal base to caudal fin base 



Number of plates dorsal to adipose 



Number of plates before dorsal 



Number of pores in the lateral line 



Number of teeth in jaws 



85.7 

 139 

 36.7 

 26.3 

 20.5 

 16.5 

 5.25 

 11.1 

 36.9 

 4.20 

 5.95 

 4.67 

 33.3 

 10.8 

 30.6 



22.2 

 38.5 

 7.59 

 33.3 

 68.8 

 23.9 

 43.4 

 82.9 

 64.4 



35.2 

 64.8 



23.8 

 1,7 

 1,4 

 1,5 

 1,6 



26 



13 

 7 

 3 



27 



27/26 



210 

 322 

 31.2 

 25.1 

 17.9 

 13.9 

 3.29 

 10.5 

 31.4 

 4.29 

 7.62 

 3.82 

 29.8 

 10.1 

 33.4 

 36.8 

 20.0 

 37.2 

 7.14 

 28.1 

 47.4 

 20.0 

 40.1 

 84.8 

 65.7 

 0.95 

 32.1 



50.2 



24.2 

 1,7 

 L4 

 1,5 

 1,6 



26 



13 

 7 

 3 



27 



30/28 



200 

 295 

 32.7 

 24.8 

 18.0 

 13.5 



3.25 

 10.8 

 31.3 



3.85 



6.75 



4.50 

 30.8 

 11.4 

 28.5 

 38.1 

 19.8 

 36.6 



7.40 

 30.0 

 49.8 

 20.8 

 43.7 

 87.5 

 68.0 



3.80 

 31.7 

 47.9 

 47.5 

 29.8 

 I,V 

 1,4 

 1,5 

 1,6 

 26 

 13 



7 



3 

 27 

 32/31 



285 

 425 

 31.2 

 28.9 

 19.9 

 12.3 



2.63 

 10.3 

 30.5 



4.25 



6.84 



4.21 

 30.2 

 10.6 

 28.9 

 37.2 

 18.6 

 39.3 



7.26 

 28.6 

 50.5 

 21.9 

 40.0 

 86.0 

 67.0 



2.63 

 33.0 

 44.8 

 47.5 

 29.3 

 1,7 

 1,4 

 L5 

 1,6 

 26 

 13 



7 



3 

 27 

 30/28 



Remarks. — Considerable uncertainty as to the limits of some of the 

 species of Hemiancistrus already described for northern South America 

 makes it difficult to distinguish the species. It appears from my 

 material and that figured by Eigenmann that in some characters the 

 species referred to this genus must vary considerably mth age, such 



