﻿Descriptions of Genera and Species 



XYLIPHIUS gen. nov. 



A genus of Bunocepbalinae. Mouth inferior : lower lip with a series 

 of antrorse fringe-like papillae, screening the month. Not greatly expanded 

 at the shoulder, the width at the pectoral spine equal to its distance from 

 the snout. Eyes minute, distant from snout as far as the interocular space. 

 Anterior nares not quite marginal. Hitherto the Aspredinidae have not 

 been recorded from Colombia. 



1. Xilr hius magdalenae sp. nov. 



Head to gill-opening 5 in the length ; depth 7 ; D. 5 ; A. 7. 



Head about as wide as long; eyes minute, about half the diameter of 

 posterior nares, maxillary barbel not quite reaching pectoral ; about 20 

 labial papillae. Coracoid processes 2 in the intercoracoid space. Distance 

 from snout to dorsal 2.33 in the length ; ventrals just reaching anal ; pec- 

 toral spine short, as long as its distance from the barbel, four strong hooks 

 on its posterior margin, the spine prolonged in a soft tip reaching nearly 

 to middle of ventrals. Caudal obliquely truncate. Head without distinct 

 ridges ; skin slightly warty except on belly. 



Light brown; tips of all the fins light. 



Tjiie, 32 mm. ; Girardot, CM. No. 4829. 



2. Bunocephalus colombianus sp. nov. 



Head to gill-opening 5.5 ; depth 6.5-7.5 ; D. 5 ; A. S, in type, 9 in 

 cotj'pe ; snout 1.5 in interorbital ; distance of dorsal from snout, 2^-2J in 

 length ; maxillary barbels extending beyond base of pectorals ; coracoid 

 process 1.5-1.6 in the space between its tips ; pectoral spine strong, curved, 

 several small hooks along its posterior margin, its filiform prolongation 

 reaching the ventrals ; caudal margin rounded ; tail subcylindrical ; tail, 

 and body to the dorsal, with numerous warts arranged in longitudinal 

 series, much smaller warts on belly and before dorsal ; a strong occipital 

 crest diverging forward to the eyes; width at base of pectorals 1.5-1.4 in 

 distance from snout to dorsal. 



Tips of all the fin rays light ; upper caudal ray barred ; ventrals and 

 anal, anteriorly, mottled. General color black, with faint mottlings. 



Type, 89 mm., Raspadura, CM. No. 4828. 



Paratype, 103 mm., Quibdo, I.U.M. No. 12687. 



3. Hemiancistrus mayoloi sp. nov. 



Head 3 ; depth 7.5 ; D. 8, its last ray minutely attached ; A; 5* ; scutes 

 22 or 23 ; eye 4.5-5 in snout, 7.5-8 in head, 3 in interorbital ; mandibular 

 ramus 3 in interorbital ; width of head 1.33 in its length, its depth 2.25. 



Head and scutes w^ithout ridges; interopercle with over thirty-five 

 spines, mostly strong, with recurved hooks, some of the marginal spines 

 of anterior half in the form of long, curved bristles, the longest spines 



(10) 



