1914.] NATURAL SCIENCES OP PHILADELPHIA. 235 



flap. L. 1. complete, midway along side, and of simple tubes which 

 at first extend half way over exposure of scale and posteriorly about 

 three-quarters. 



Dorsal origin about midway between snout tip and end of adipose 

 fin, first branched ray highest, extends almost as far posteriorly 

 as tip of last, and depressed fin reaches but slightly less than half 

 way to caudal base. Adipose fin small, inserted about midway 

 between end of depressed dorsal and caudal base. Anal inserted 

 close behind depressed dorsal tip, and fin extends about two-thirds 

 to caudal base. Caudal well forked, sharply pointed lobes about 

 equal. Pectoral pointed, with median rays longest, and fin reaches 

 almost to ventral origin. Ventral inserted about opposite middle 

 of dorsal base, fin reaches four-fifths to anal. Vent close before anal. 



Color in alcohol with very pale brown ground color, scarcely 

 paler below. A narrow bro^vnish lateral band, about equal to 

 diameter of pupil in width on head, though on trunk reduced to 

 narrow line, extends from snout tip to caudal base where it ends in 

 small detached dusky spot. Head pale brownish above, whitish or 

 paler beneath. Lips and front half of maxillary dusky, though 

 posterior half of maxillary contrasted pale or whitish like lower 

 surface of head. Eye slaty. Trunk with ten transverse deep 

 brownish bands, a little broader than interspaces, and within area 

 of each edge of each scale deeper brown. Dorsal and caudal dull 

 grayish, with at least three transverse or horizontal dusky streaks 

 across former. Pectoral, ventral and anal pale and uniform. No 

 dark median dorsal streak. 



Length 47 mm. 



Type, No. 39,307, A. N. S. P. Rupununi River, British Guiana. 

 J. Ogilvie. 



Also Nos. 39,308 and 39,309, same data, paratypes. These show: 

 Head 3| and 3|; depth 5 and 5^; D. iii, 9 and in, 7; scales 32 ? 

 (injured) in 1. 1. to caudal base and about 3 more on latter; 5 scales 

 above 1. 1.; 3 scales below 1. 1. to anal origin; 9 predorsal scales; 

 snout 4| and 4; eye 3j and 3|; maxillary 4 and 4|; interorbital 

 4j and 4; length 35 and 42 mm., respectively. The smaller example 

 differs from the others in having the pectoral extending slightly 

 beyond the ventral origin and the latter fin reaching the anal origin. 



This species is related to Characidium etheostoma Cope^ in colora- 

 tion, but is much more slender, thus approaching Characidium 



' Proc. Acad. Nat. Sci. Phila., 1906, p. 32.3, fig. 17. Type. 



