.502 Mr. C. T. Regan— ^ Revision 



13. Rivulus atratus. 

 Hivulus atratus, Garman, Mem. Mus. Comp. Zool. xix. 1895, p. 140. 



Depth of the body 6 in the length, length of head 4. 

 Head broader than deep. Diameter of eye 3^ in length of 

 head. 31 scales in a longitudinal series. Dorsal 6 ; origin 

 3 times as distant from occiput as from base of caudal ; base 

 its length further back than that of anal. Anal 9-10. 

 Pectoral nearly as long as head ; pelvics very small, not 

 reaching vent. Brownish ; blackish below, with three 

 vertical bands ascending respectively behind the pectorals, 

 between pelvics and anal, and to the base of the dorsal ; a 

 dark stripe from eye round chin. 



Jutahy. 



14. Rivulus ubscurus. 

 Hivulus obscurus, Garm. Mem. Mus. Comp. Zool. xix. 1895, p. 140. 



Moderately slender, with the head broader than deep. 

 Diameter of eye 3 in length of head. 29 scales in a longi- 

 tudinal series. Dorsal 6 ; origin above middle of anal, 3 

 times as distant from middle of eye as from base of caudal. 

 Anal 8, about half its base in front of dorsal. Pelvics hardly 

 reaching anal. Back brownish, sometimes with darker 

 blotches, among which there may be two series of pale 

 blotches. 



L. Hyanuary, Amazon. 



15. Rivulus strigatus, sp. n. 



Depth of body 5 in the length, length of head 4. Head 

 broader than deep. Diameter of eye 3i in the length of 

 head. 33 scales in a longitudinal series. Dorsal 8 ; origin 

 twice as distant from head as from base of caudal. Anal 12, 

 ending below middle of dorsal. Pectoral | the length of 

 head, not reaching pelvics, which extend to origin of anal. 

 Olivaceous above, orange below ; dark longitudinal stripes 

 along series of scales on sides; irregular spots on back; 

 dorsal, caudal, and posterior part of anal barred. 



Amazon. 



1 (type). 37 mm. Amazon. Arnold. 



16. Rivulus geayi. 



Rivulus geayi, Vaill. Ball. Mus. Paris, 1899, p. 156. 



Depth of body 4^ to 5 in the length of head, length of 



