504 Mr. C. T. Eeoan — A Revision 



19k Rivulus br 



Inndulus bradliensis, Val. in Humboldt, Observ. Zool. ii. p. 163, pi. lii. 

 fig. 2 (1828) ; Cuv, & Val. Hist. Nat. Poiss. xviii. 1846, p. 200. 



Depth of body 4 in the length, length of head 3|. Diam- 

 eter of eye about 3| in the length of head. 30 or 31 scales 

 in a longitudinal series. Dorsal 8; ori^iin above anterior 

 part of anal, equidistant from middle of pectoral and base of 

 caudal. Anal 11, ending below end of dorsal. Pectoral 

 almost reaching pel vies, which reach anal. Brownish ; 9 or 

 10 blackish bars on lower part of body, from pelvic fin to 

 caudal ; dorsal dusky. 



Brazil. 



Total length 2^ inches. 



I am indebted to Dr. Pellegrin for kindly informing me 

 that he counts 30 or 31 scales in a longitudinal series in the 

 types ; this is quite a dift'erent species from R. urophthalmus. 



20. Rivulus breviceps. 



Rivuhis breviveps, Eigenm. Ann. Carnegie Mus. vi. 1909, pp. 48, 49; 

 Mem. Carnegie Mus. v. 1912, pp. 452, 453, pi. Ixiii. fig. 1. 



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

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

 33 scales in a longitudinal series. Dorsal 9-10 ; origin 

 above anterior part of anal, equidistant from middle of 

 pectoral and base of caudal. Anal 11-12, ending below 

 posterior part of dorsal. Pectoral ^ length of head, not 

 extending to pelvics, which just reach anal. Brownish; a 

 few vertical bars across middle rays of caudal. 



British Guiana. 



1 (co-type). 35 mm. Shrimp Creek. Eigenmann, 



21. Rivulus balzanii. 

 Haplochilus balzanii, Perugia, Ann. Mus. Genova, (2) x. 1891, p. 653. 



Depth of body 4 in the length, length of head 3. Head 

 depressed. Diameter of eye 3 in length of head. 34 scales 

 in a longitudinal series. Dorsal 9, originating above seventh 

 ray of anal. Anal 14. Sides with 4 or 5 brownish longitu- 

 dinal stripes, each covering a series of scales ; dorsal and 

 anal with 3 series oE brown spots. 



Villa Maria, Matto Grosso (Rio Paraguay). 



22. Rivulus brevis, sp. n. 

 Depth of body 3§ in the length, length of head 3|. Head 



