of Poeciliid Fishes. 497 



2. Rivulus holmia. 



Rivulus holmite, Eigenm, Ann. Carnegie JMua. vi. 1909, pp. 49, 50 ; 



Mem. Carnegie Mus. v. 1912, pp. 452, 453, pi. Ixiii. fig's. 2, 3. 

 Rivulus loaimacui, Eigenm. /. c, & t. c. pp. 452, 454, pi. Ixiii. figs. 4, 5. 



Depth of body about 5 ia the length, length of head 4 to 

 4|. Head broader tlian deep. Diameter of eye 3i to 4 in 

 the length of head. 46 to 50 * scales iu a longitudinal 

 series Doiv-^al 9 ; origin above posterior part of anal, at 

 least twice as distant from head as from base of caudal. 

 Anal 16-17, ending below middle or posterior part of dorsal. 

 Pectoral | length of head, not extending to pel vies, which 

 just reach vent. In spirit brownisii, with darker spots 

 which may become confluent to form longitudinal stripes, of 

 which 3 on the tail are most prominent; vertical fins with 

 series of small spots ; caudal ocellus sometimes present. In 

 life the back olive, sides olive or blue, belly white, yellow, or 

 orange, spots or stripes red, brown, or purplish. 



British Guiana. 



1-2 (co-types). 50-60 mm. Holmia. Eigenmauu. 



3-4 (co-types of -R. xoaimacui). Shrimp Creek. „ 



3. Rivulus ocellatus. 



Rimdus ocellatus, Hensel, Arch. f. Nat. xxxiv. 1868, p. 365. 



Depth of body 4^ to 5 in the length, length of head 3| 

 to 4. Head broader than deep. Diameter of eye 3^^ to 4 

 in the length of head. 47 to .oO scales in a longitudinal 

 series. Dorsal 8-9 ; origin above posterior part of anal, 

 twice as distant from base of pectoral as from base of caudal. 

 Anal 11-12, ending below anterior part of dorsal. Pectoral 

 f or I the length of head, not extending to pelvics, which 

 reach the vent. A dark spot (ocellated in $ ) on upper part 

 of base of caudal, another above the pectoral ; vertical fins 

 more or less distinctly spotted ; male with irregular dark 

 cross-bands on body and with a blackish margin and pale 

 intramarginal band to vertical fins. 



Rio Janeiro ; Santos. 



1. 60 mm. Santos Arnold. 



2-3. 40-45 mm. ,, Bartsch. 



Dr. Pappenheim has very kindly informed me that the 

 type has 48 to 50 scales in a longitudinal series, not 39 as 

 stated in the original description. 



* Eigeumann coimts 43 scales in holmice, 46 to 52 in xoaimacui, but in 

 co-types of the former 1 count 46 and 47, of the latter 47 and 50. 



