506 Mr. C. T. Began— .4 Revision 



II. Pectoral fin extending beyond origin of anal. 



A. Dorsal origin behind that of anal, nearly equidistant from end of 

 snout and base of caudal, or nearer the latter. 



D. 18. A. 20. 40 scales in a longitudinal series .... 4. porosiis. 



D. 22. A. 24. 3.3 scales in a longitudinal series .... 5. robustus. 

 D. 21-24. A. 26-30. 28 to 30 scales in a longitudinal 



series G. bellottii. 



B. Dorsal origin a little in advance of that of anal, nearer to end of 

 snout than to base of caudal. D. 26. A. 25. 28 scales in a 

 longitudinal series 7. nii/ripiimis. 



1. Cynolebias melanotcenia, sp. n. 



Depth of body 3j to 4^ in the length, length of head 3j 

 to 3^. Candal peduncle longer than deep. Diameter of 

 eye 3 in the length of head. 28 scales in a longitudinal 

 series. Dorsal 16-18, origin above that of anal, equidistant 

 from some part of eye and base of caudal. Anal 17-20. 

 Dorsal and anal rather elevated posteriorly. Pectoral 

 shorter than head, not reaching anal ; pelvics small, not 

 reaching anal. A blackish lateral band from lower jaw 

 through eye to base of caudal, another at base of anal con- 

 tinued forward to base of pectoral, sometimes a third on the 

 back ; vertical fins usually spotted. 



S.E. Brazil. 



1-9 (types). 32-37 mm. Paranagua. Rachow. 



2. Cynolebias eloiigatus, 

 Cynolebias elongatus, Steind. Denkschr. Akad. Wien, xliv. 1882, p. 11. 



Depth of body 3^ in the length, length of head 3. Caudal 

 peduncle longer than deep. Diameter of eye 6 in length of 

 head. 45 to 50 scales in a longitudinal series. Dorsal 17 ; 

 origin equidistant from praeoperculum and base of caudal ; 

 posterior rays longest, |^ length of head. Aiial 20 ; origin 

 scarcely in advance of that of dorsal ; middle rays longest, 

 rather shorter than longest rays of dor>al. Pectoral as long 

 as postorbital part of head, extending to middle of pelvics, 

 which reach the vent. Brownish ; a dark vertical bar 

 through eye ; vertical fins spotted. 



La Plata. 



1. 140 mm. La Plata. Arnold. 



