ElGENMANN I THE EXPEDITION TO BRITISH GUIANA. 37 



Resembling Hadropterus. 



Head 4-4.25; depth 5.4-6; D. n; A. 8; scales 4-37-2)4, 9 

 median scales anterior to dorsal ; eye 1.66 in the snout, 4.6 in the 

 head, about 1 in the interorbital ; bony interorbital equals .5 diameter 

 of eye; teeth obscurely three-pointed. 



Snout long, pointed. Pectorals, with the tips of the outer rays 

 thickened, not reaching ventrals ; ventrals not to anal ; highest anal 

 ray equals length of caudal peduncle, not reaching the fulcra of the 

 caudal ; third dorsal ray reaching tip of last ; base of dorsal equals one- 

 half its distance from the adipose fin, about 8 in the length ; tip of 

 third dorsal ray reaching much beyond tip of the last ray. 



A conspicuous band from the tip of the snout to the middle of the 

 caudal, bordered above by an interrupted yellowish band about half its 

 width ; a dark band along middle of the back, another between it and 

 the lateral band ; a dark streak parallel to the lateral band below it in 

 front of the caudal peduncle. About eight bands across the back to the 

 lateral band, sometimes continued below the lateral band directly, or 

 with a shift backward or forward. Lower surface silvery ; opercle, 

 angle of preopercle, and a band below the eye sometimes dark ; axil 

 and spot above origin of ventrals and a streak along base of anal dark ; 

 lower surface of chin pale or dark. All these markings sometimes ob- 

 scured by increased pigmentation. Dorsal nearly uniform. Caudal 

 lobes with an oblique black bar ; area between this bar and the basal 

 spot of the middle rays pigmentless, faintly dusky posterior to the 

 black bars. Tips of outer rays of pectoral and ventral and the first 

 rays of the anal swollen, these fins hyaline, except for a few color-cells 

 along the middle of the middle rays. 



This species rivals the darters in its coloration. 



Characidium blennioides sp. nov. 

 (Native name, Seesu.) 



Type, 52 mm. (No. 1 144 Carnegie Museum Catalog of Fishes.) 

 Erukin, tributary of the Potaro above Kangaruma. 



Cotypes, 6 specimens, 43-52 mm. Erukin (C. M. Cat. No. 

 1145, a ~b > I- U. Cat. No. 11675.) 



Cotype, 1 specimen, 55 mm. Tukeit. (C. M. Cat. No. 1146, a.) 



Cotypes, 2 specimens, 42-^4 mm. Creek above Potaro Landing. 

 (C. M. Cat. No. 1 147, a; I. U. Cat. No. 11676.) 



Cotypes, 5 specimens, 43-49 mm. Tumatumari. (CM. Cat. No. 

 1 148, a-b ; I. U. Cat. No. 11677.) 



