20 ON THE SPECIES OF THE GENUS ANOSTOMUS. 



ually darker at the points of intersection of the longitud- 

 inal and the transverse bands. The latter are frequently 

 indistinct, even on very young specimens. On large ones 

 the depth is less than four and the head rather more than 

 four and a half times in the total length, and the markings 

 are greatly faded ; some have the longitudinal bands more 

 distinct, others the transverse, and on a few all of the 

 bauds, including the caudal spot, are obsolete. Eight or 

 nine of the dorsal rays are in front of the middle of the 

 length. The peculiar coloration, squamation, and stouter 

 form serve to distinguish this fish from either of the two 

 preceding species of this subgenus. 



Hab. Gurupa, Jose Fernandez, Lake Hyanuary, 

 Manaos, Obydos, Porto do Moz, Rio Negro. 



ANOSTOMUS NITENS. 

 A. varius, var. n. 



This name is given to a dozen light colored specimens 

 from Iga. The transverse bauds of the flank are reduced 

 to blotches on the lateral line, the longitudinal line is faint 

 or absent, and the general appearance is greyish rather than 

 brown. The back is crossed by numerous narrow streaks, 

 twenty-eight on one specimen, separated by lighter spaces 

 of equal width. The lateral series of blotches is present 

 on eight of the lot, while on the other four they are obso- 

 lete, excepting the caudal spot which is much faded. The 

 eye is large, equal to three-elevenths of the length of the 

 head, or to the length of the snout. Nine rays of the 

 dorsal appear in front of the middle of the length. 



ANOSTOMUS ORINOCENSIS St. 



In the description of this fish it is said there are seven 

 scales between the lateral line and the dorsal, and three 

 and a half between the line and the ventral ; the latter 



