40 Annals of the Carnegie Museum. 



fin. A dark band about two-thirds up on the dorsal and one across 

 base of the anterior rays, both very faint ; caudal with a few faint dark 

 spots ; .fins otherwise hyaline. 



Characidium pteroides sp. nov. 



Type, 28 mm. (No. 1 1 57 Carnegie Museum Catalog of Fishes. ) 

 Konawaruk. 



Cotypes, 2 specimens, 25-27 mm. Konawaruk. (I. U. Cat. No. 

 11684.) 



Cotype, 1 specimen, 23 mm. Rockstone. (C. M. Cat. No. 1158.) 



Cotype, 1 specimen, 24 mm. Wismar. (I. U. Cat. No. 11 685.) 



A characin burrowing in sand, very similar to C. pellucidnm. 



Head 4 ; depth 6 ; D. 11 ; A. 7 ; scales 4-36-2. Eye considerably 

 longer than snout, a little over 3 in the head ; teeth three-pointed. 



Pectorals about reaching ventrals, the tips of its outer rays not thick- 

 ened ; ventrals not nearly to anal ; anal rounded, not nearly reaching 

 the caudal fulcra. Third dorsal ray reaching about to second third 

 of the last ; base of dorsal 1.3 in its distance from the adipose, 6 in 

 the length. 



Hyaline. Sides with numerous crescents of brown ; back with 

 about thirteen cross-bars made up of crescents ; in places two opposing 

 crescents form ocelli. A dark band from eye to end of snout ; a black 

 bar through the opercle ; a deep-seated spot on angle of preopercle ; a 

 streak, sometimes broken, backward from eye ; an interrupted black 

 line along the ventral surface, concentrated between the ventrals and 

 in front of the anal. Faint markings on dorsal, caudal, and anal ; fins 

 otherwise hyaline. 



Characidium catenatum sp. nov. 



Type, 38 mm. (No. 1153 Carnegie Museum Catalog of Fishes.) 

 Warraputa. 



Cotypes, 12 specimens, 32-35 mm. Rockstone sandbank. (C. M. 

 Cat. No. 1 1 54, a-d ; I. U. Cat. No. 11 681.) 



Cotypes, 2 specimens, 37, 38 mm. Crab Falls. (C. M. Cat. No. 

 1 1 55, a ; I. U. Cat. No. 11682.) 



A sand-burrowing characin, resembling Ammocrypta pellucida. 



Head 4-4.2 ; depth 6-6.2 ; D. 10 or n ; A. 8 ; scales 4-38-3, 10 



before the dorsal. Eye a little longer than snout, 3.3 in head ; bony 



interorbital about two in eye. Teeth conical. 16 



16 This species stands alone of those from Guiana in having single-pointed, strictly 

 conical teeth. 



