the San Juan River, Colombia. - 4G9 



barbel nearly as long as bead, extending to basal part of 

 pectoral. Dorsal 9, with 6 branched rays ; free edge 

 straight ; origin a little in advance of vent, 1| as far from 

 end of snout as from base of caudal. Anal 7, with 4 branched 

 rays ; origin a little behind end of dorsal. Pectoral filament 

 as long as head, branched rays 5 to f length of head. 

 Caudal truncate or slightly cmarginate. Yellowish, with 

 dark brown spots on body and fins ; young with a dark 

 lateral band. 



Three examples, 130 to 250 mm. in total length, from the 

 Rio Sipi and Rio Tamana (Palmer). 



28. Pygidium taenia, Kner. 

 R. Sipi and R. Tamana {Palmer). 



Loricariidae. 



29. Lasiancisfrns caucanus, Eigenm. 

 R. Condoto (Spurrell). 



30. Hemiancistrus mayoloi, Eigenm. 



31. Hemiancistrus Iwlostictus, sp. n. 



Depth of body 4^ in the length, length of head 3^. Head 

 as broad as long, its depth If in its length, length of snout 

 If, diameter of eye 7, interorbital width 2jf. Length of 

 barbel equal to that of mandibular^ ramus or to diameter of 

 eye. Interoperclc freely movable, but with only 2 or 3 very 

 short spines. Occipital plate with median ridge, bordered 

 by a single scute; temporal plates keeled. Scutes keeled, 

 2f> in a longitudinal series ; abdomen in great part naked, 

 scaly in front and at the sides. Dorsal I 7; base nearly as 

 long as distance from caudal; first ray longer than head, 

 reaching adipose fin when laid hack : last nearly f_ as long. 

 Anal I 1. Pectoral spine extending to anterior -\ of pel vies. 

 Caudal emarginate. Caudal peduncle nearly 3 times as long 

 as deep. Head, body, and fins covered with round dark 

 spots. 



A single specimen, 180 mm. in total length. 



This speeies is mar H. annectens, Regan, from Western 

 Ecuador, but differs in the deeper form, the larger dorsal 

 fin, the very small interopcrcular spines, &c. 



32. Pseudancistrus sctosit.-t. Bouleng. 

 R. Tamana (Palmer). 



