1906.] 



NATURAL SCIENCES OF PHILADELPHIA. 



309 



the anterior dorsal rays. Most of rays of the fins are specked with 

 brownish. 



This species is related to Eigenmannina orinocensis (Steindachner), 

 but differs in the fewer scales, absence of the dark median lateral blotch 

 and the coloration of the caudal. 



CHILOMYZON subgen. nov. 

 Type Prochilodus steindachneri sp. nov. 

 Scales large, less than 40, usually between 33 and 38 in a lateral 

 count. Mouth disk-like and inferior. Related to Prochilodus Agassiz. 



(XeVjK^j lip; /x'jCw, to suck.) 

 Prochilodus steindachneri sp. nov. Fig. 11. 



Head 3^; depth 2f ; D. iii, 9, i; A. iii, 8, i; P. i, 14; V. i, 8; scales 34 

 in lateral line to base of caudal and 3 more on latter; about 14 scales 



Prochilodus steindachneri Fowler. 



before dorsal; 7 scales obliquely back from origin of dorsal to lateral 

 line; 6 scales obliquely forward from origin of ventral to lateral line, 

 and same number in similar count from origin of anal; about 16 scales 

 from isthmus to origin of ventral ; 3 scales obliquely back from origin 

 21 



