ElGENMANN : THE EXPEDITION TO BRITISH GUIANA. 45 



Allied to P. marginatus and P. trifasciatus. 



Head 3.75; depth 4.66-4.75; D. 10; A. 9 or 10; scales 5 be- 

 tween D. and V., 10 before D., 26 in a median line. Eye equal to 

 snout and to interorbital, 3.2 in the head ; jaws equal. 



Dorsal over the vertical from the ventrals ; pectorals reaching half 

 way to middle of ventrals; ventrals half way to middle of anal ; adi- 

 pose fin a little anterior to the tip of the last anal ray ; origin of anal 

 on a vertical from the tip of the last dorsal ray. 



Back light brown margined by a more or less faint darker line ; streak 

 from snout through top of iris to upper half of middle of caudal light ; 

 a conspicuous lateral black band from mandible to base of lower caudal 

 lobe, continued on the rays just below the middle ; a dark streak from 

 behind the base of the lower pectoral rays to and along base of the 

 anal ; middle anal rays dusky. Ventral surface silvery. 



In life a blood-red streak borders the superior margin of the black 

 lateral band over middle of the pectorals ; a red spot on basal half of 

 the dorsal, two red spots on base of the caudal, one similar spot on the 

 anal lobe ; an orange spot on each ventral fin. 



Poecilobrycon ocellatus sp. nov. 



Type, 41 mm. (No. 11 79 Carnegie Museum Catalog of Fishes.) 

 Wismar. 



Cotypes, 2 specimens, 39, 41 mm. Wismar. (I. U. Cat. No. 

 11703.) 



Cotypes, 71 specimens, 35-43 mm. Rockstone sandbank. (C. M. 

 Cat. No. 1 181, a-j\ I. U. Cat. No. 11 704.) 



Cotypes, 9 specimens, 33-42 mm. Gluck Island. (C. M. Cat. 

 No. 1181, a-c ; I. U. Cat. No. 11705.) 



Cotypes, 8 specimens, 31.5-37 nim. Rupununi Pan. (C. M. Cat. 

 No. 118, a-c; I. U. Cat. No. 11 706). 



Cotype, 1 specimen, 39 mm. Crab Falls. (C. M. Cat. No. 

 1183, a.) 



Cotypes, 2 specimens, 39, 42 mm. Tumatumari. (C. M. Cat. 

 No. 1184, a; I. U. Cat. No. 11707.) 



Cotypes, 18 specimens, 31-43 mm. Konawaruk. (C. M. Cat. 

 No. 1 185, a-e; I. U. Cat. No. 11 708.) 



Most nearly related to P. unifasciatus Steindachner. 



Head 4.2-4.4; depth 5.4-5.5; D. 10; A. 10 or 11 ; scales 5 be- 

 tween D. and V., 10 before D., 28 along a lateral series. Eye a little 



