﻿TCHTHYOLOGICAI. RP:]CC)NXAISSANCE OF COLOMBIA 



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and bristles, in type, about one-fourth lengtli of lieacl, mostly shorter in para- 

 types. Six scutes between dorsal and adipose, 10 + 2 between anal and 

 caudal ; supraoccipital bordered by three plates, the first median scute 

 forming most of the border. Head ventrad and abdomen naked. 



Rays of all fins with spots which tend to form bars, especially on 

 caudal. 



For Mr. Mayolo. of Buenaventura, Colombia. 

 Type, 125 mm., Istmina. CM. No. 4826. 



Paratypes, five specimens, Istmina, CM. No. 4827 a-b ; I.U.M. No. 

 12688 a-c. 



4. Hemiancislrus daguse sp. nov. 



Head 3-3.2 ; depth 7 ; D, 1.8 in eleven specimens, 1.9 in thirty-two speci- 

 mens ; A. 5: plates 24 or 25; width of head nearly equal to its length; 

 eye 5.5-6.5 in snout, 9-10 in head, 2.5-3 in interorbital ; mandibular ramus 

 very little less than interorbital width,. 



Scutes without keels; occipital without keel, bordered by 3 plates; 

 ]>reopercular spines usually not completely revertible, longest spine 2.5 

 in head in a few specimens, usually shorter. Margin of head and preopercle 

 without bristles. Last dorsal ray but feebly attached, tip of last ray 

 sometimes reaching adipose; length of base of dorsal equal to its distance 

 from the caudal or less. Pectoral ray reaching to the ventral or to near 

 its middle ; ventrals to the anal, or slightly beyond base of its last ray. 



Very dark ; rays of all the fins spotted, the spots on the dorsal and 

 caudal rays smallest and most numerous ; some specimens with the fin 

 markings much fainter ; the spots in the smallest specimens less numerous. 



Type, 79 mm., Cildas CM. No. 4842. 



Paratypes, thirty-four specimens, largest 95 mm., Caldas CM. No. 

 4843 a-g, I.U.M. No. 12698 a-g. 



Paratypes, eight specimens, Cisnero, CM. No. 4844 a-d, I.U.M. No. 

 12699 a-d. 



5. Lasiancistrus caucanus sp. nov. 



Head 2.75 ; depth 5 ; D. 8, its last ray but feebly attached to the 

 adjoining scute; A. 5.5; scutes 24; seven scutes between dorsal and adi- 

 pose, ten between* anal and caudal; eye 5.5 in snout, 9 in head, 3.75 in 

 interorbital ; width of mandibular ramus 3.33 in interorbital ; width of 

 head 1.3 in its length, its depth 2.2. Head and scutes without ridges ; 

 interopercle with o^'er twenty spines, the longest nearly one-third as long 

 as head, anteriorly with long bristles, the longest bristle nearly as long as 

 the longest spine ; snout with bristles laterally, which may be very minute 

 or as long as eye ; supraoccipital bordered by three plates'^ which are 

 about equally in the border. Pectoral spines extending beyond middle of 

 ventrals Fins nearly black (adult), the caudal narrowly margined with 

 lighter. Body very obscurely marbled. In young the fins, except caudal, 

 with faint markings on the rays. 



Type, 171 mm.. Cartago, CM. No. 4824. 



Paratypes, eight, 105-175 mm., same place, CM. No. 4825 a-d; I.U.M. 

 No. 12683 a-d. 



" In one specimen by a single plate. 



