116 BULLETIN 95, UNITED STATES NATIONAL MUSEUM. 



Family CICHLIDAE. 

 Genus AEQUIDENS Eigenmann and Bray. 



144. AEQUIDENS RIVULATUS (GUnther). 



SAEKA; MAJARRA. 



Plate 11, fig. 2. 



Chromis rivulata Guntheb, Pi'oc. Zool. Soc. London, 1859, p. 418. 

 Acara pulchra Gunther, Cat. Fish. Brit. Mus., voL 4, 1882, p. 280. 

 Acara rivulata Regan, Fislies of the South American Cichlid genus Acara 

 Ann. Mag. Nat. Hist., ser. 7, vol. 15, 1905, p. 338. 



Five specimens, field No. 09431, and three specimens. No. 09432, 

 3.3 cm. to 15 cm. in length, from Pacasmayo, taken from a small dirty 

 stream flowing through the village, and two specimens, field No. 

 299, 11 and 11.2 cm. long, from Eten, taken in Rio de Eten about 

 1 mile from its mouth. Local name of species, Majarra. 



Head 2.68 to 2.8 in length; depth 2.25 to 2.55; eye 4.28 to 5.25 

 in head; maxillary 3 to 3.4; snout 2.1 to 2.37; pectoral 1.1 to 1.2; 

 scales 4-26 or 27-9; D. XIV, 11 or 12; A. III,''9 or 10. 



Body compressed, greatest depth at origin of dorsal; upper 

 profile of head straight in smaller individuals, usually slightly con- 

 cave in larger examples; interorbital slightly concave or flattened; 

 maxillary not reaching vertical from front margin of eye; scales 

 heavy, horny; posterior rays of dorsal and anal lengthened, their 

 tips reaching in older examples nearly to the middle of the caudal. 



Color in life: Gaudy with green and blue markings which fade 

 rapidly in formalin; upper parts of head olivaceous (sides and 

 lower parts mostly green and blue (the green changing to blue in 

 the air) ; markings irregular and unsymmetrical, but a narrow 

 stripe of bluish green extending from below eye to upper jaw, two- 

 thirds of the way back from front of jaw, and below this stripe 

 another parallel to it ; still other spots and lines above these ; ground 

 color of body olivaceous, crossed by three to five light vertical bars, 

 a black spot, larger than eye, about midway between opercle and 

 caudal, below lateral line; another at base of caudal; these spots 

 conspicuous in small examples and hardly observable in the largest ; 

 upper parts of sides, vertical fins and ventrals, spotted with blue 

 or green; caudal and dorsal tipped with white; pectoral light 

 olivaceous. 



Some specimens were lighter than others; the smaller the fish 

 the more distinct were the light bars. 



