504 Mr. C. T. Regan— ^ Reomon 



19. Rivulus brasiliensis. 



Fundulus brasiliensis, 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; origin above anterior 

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

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

 almost reaching pelvics, 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 different species from R. urophthalmus. 



20. Rivulus breviceps. 



Rivulus breviceps, Eigeum. Ann. Carnegie Mug. vi. 1909, pp. 48, 49; 

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



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

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

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

 above anterior part of anal, equidistant from middle of 

 pectoi-al 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 of brown spots. 



Villa Maria, Matto Grosso (Bio Paraguay). 



22. Rivulus brevis, sp, n. 

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



