1913.] NATURAL SCIENCES OF PHILADELPHIA. 675 



Type, No. 21,424, A. N. S. P. Nauta, on the Maranon River, 

 Peru. 1873, Prof. James Orton. From Prof. E. D. Cope. 



Also Nos. 21,425 to 21,427, A. N. S. P., paratypes, same data. 

 These show: Head 2f to 2|; depth 2| to 2f ; D. iii, 9; A. iii, 7 or 

 iii, 8; scales 29 or 30 in 1. 1. to caudal base and 3 more on latter; 

 5 or 6 scales above 1. 1.; 5 scales below 1. 1. to ventral origin; 10 

 predorsal scales (mostly damaged); snout 3| to 3f in head; eye 

 2f to 2|; maxillary 4f to 4f; interorbital 2| to 2f ; length 33 to 

 38 mm. (caudals damaged). 



This species is related to Ciirimatus dorsalis Eigenmann and 

 Eigenmann.2 In C. dorsalis the preventral region is described 

 with a median series of large scales, though in the present species 

 they are uniform in size. C. dorsalis has persistent scales, with the 

 broadly rounded posterior margin crenate, and in C. stigmaturus 

 the scales have the rounded posterior margin entire. C. dorsalis 

 has the pores of the anterior scales of the lateral line imperfectly 

 developed or wanting, while in C. stigmaturus they are about equally 

 developed. C. dorsalis has origin of dorsal midway between tip of 

 snout and tip of adipose fin, while it is more anterior in C. stigmaturus. 

 The other characters given for C. dorsalis are largely in agreement, 

 though do not appear to me to be construed as due to age. 



(Iriyfia, blotch; oopa, tail; on account of the dark caudal spot.) 



s Ann. N. Y. Acad. Sci., IV, 1889, pp. 4-20. » 



