152 MR. C, TATE REGAN ON SOUTH- AMERICAN [Mar. 7, 



1. A Revision of the Fishes o£ the South-American Cichlid 

 Genera Crenacara, Batraohops, and Crenicichla. By 

 C, Tate Eegan, B.A., F.Z.S. 



[Received Februarj- 7, 1905. | 



(Plates XIY. & XV.*) 



The genei"a dealt with in the following revision are distinguished 

 from all other Cichlid^ by the denticulated posterior margin of 

 the preeoperculum. I have given a list of the specimens in the 

 British Museum Collection on which my descriptions are based, 

 with the total length in millimetres of each. 



Crenacara. 



Crenicara Steind. Sitzb. Ak. Wien, Ixxi. 1875, p. 99 ; Eigenm. 

 & Bray, Ann. Ac. N. York, vii. 1894, p. 619 ; Pellegr. Mem. Soc. 

 Zool. France, xvi. 1903, p. 169 (1904). 



Dicrossus Steind. t. c. p. 102 ; Eigenm. & Bray, t. c. p. 620; 

 Pellegr. t. c. p. 170. 



Body ovate or elongate, more or less compressed ; scales large, 

 ctenoid. Two lateral lines ; scales of the lateral line of the same 

 size as those above and below it. Mouth small ; Jaws equal 

 anteriorly ; maxillary not exposed ; a band of small conical teeth 

 in each jaw ; upper surface of head scaly to between the orbits ; 

 cheeks and opercular bones scaly ; posterior border of p'rseoperculum 

 finely denticulated. Gill-rakers short, few. A single dorsal with 

 XIV-XYII 8-9 rays. Anal with III 7-8 rays. Pectoral 

 asymmetrical, with 15 rays; ventrals a little behind the bases of 

 the pectorals. Caudal rounded. 



Two species from the Amazon and Guiana. 



1. Crenacara punctulata. 



Acara punctulata (part.) Glinth. Ann. Mag. Nat. Hist, xii, 

 1863, p. 441. 



Crenicara elegans Steind. Sitzb. Ak. Wien, Ixxi. 1875, p. 99, 

 pi. i. fig. 1. 



Crenicara punctulata Pellegr. Mem. Soc. Zool. France, xvi. 

 1903, p. 169 (1904). 



Depth of body 2^-2|- in the length, length of head 3^. Snout 

 a little shorter than eye, the diameter of which is 2| in the 

 length of head and equals the interorbital width. Depth of 

 prseorbital | the diameter of eye. Maxillary not extending to 

 below the eye ; jaws eqvial anteriorly ; cheek with 3 or 4 series 

 of scales, none on the prseoperculum ; 6 gill-rakers on the lower 

 part of anterior arch. Scales 29 |, 1 between lateral line and 



* For explanation of the Plates, see p. 168. 



