ON THE SPECIES OF THE GENUS ANOSTOMUS. 17 



mouth directed forward, lower jaw little if any longer ; 

 lower teeth short, broad, crenulate (SCHIZODON). 

 series of scales 4 from L.I. to D. ; 

 transversely banded with brown ; 



bands 3, a caudal band . . vittalus. 

 bands 4, a caudal spot . fasciatus. 

 bands blotch-like, no caudal spot 



dissimilis. 



series of scales 6 from L.I. to D. ; 

 transverse bands absent ; 



rows of scales 5 between L.I. and V. 



isognalhus. 

 rows of scales 4 between L.I. and V. 



plalas. 

 mouth directed obliquely downward and forward, 



lower jaw shorter ; 

 series of scales 5 from L.I. to D. . nasutus. 



(Anostomus.) 

 ANOSTOMUS SALMONEUS Gron. 



Without a specimen of this species at hand it is not pos- 

 sible to give the characters of the teeth, these having been 

 unnoticed by previous writers. If they agree with those 

 of the following species, as may be expected, the crenula- 

 tion will be added to the distinguishing characteristics in 

 the diagnosis of the subgenus. 



ANOSTOMUS TRIMACULATUS Kn. ; Gth. 



Mouth directed upward ; snout elongate, nearly round 

 in transverse section in front of the eyes, about twice the 

 length of the eye ; teeth crenulate in both jaws. The 

 formula as taken from a specimen from Gurupa is D. 12 



ESSEX INST. BULLETIN, VOL. XXII 2 



