American Cichlid Genus Ciclilosoma. 71 



Heros Jenynsii, Steind. t. c. p. 292, pi. ii. 

 Heros acnroides, Hensel, Arch. f. Nat. xxxvi. 1870, p. 54. 

 Acara faceta, iSteind. Sitzb. Ak. Wien, Ixx. 1874, p. 506, 

 Cichlasoma facetum, Pellegr. M6in. Soc. Zool. France, xvi. 1903, 

 p. 217 (1904). 



Depth of body l|-2.l in the lengtli, length of head 2f-3. 

 Eye nearer to tip of snout than to the extremity of oper- 

 cuhim, its diameter 3-44 in the length of head, interorbital 

 width 2^-2i. Depth of prseorbital equal to diameter of eye 

 (adult), or a little more than | diameter of eye (youugj. 

 Maxillary not or scarcely reaching the vertical from anterior 

 margin of eye ; prremaxillary processes extending to above 

 anterior margin of eye; jaws equal anteriorly; fold of the 

 lower lip not continuous ; cheek with 4-5 series of scales, 

 the lower 1 or 2 rows often deciduous in the adult ; 7 or 8 

 gill-rakers on the lower part of the anterior arch. Scales 

 26-28 j|^||, 1^ between lateral line and base of anterior rays 

 of soft dorsal. Dorsal XV-XVII 9-11, commencing above 

 the opercular cleft, tlie spines increasing in lengtli to the 

 last, which is nearly half the length of head, the soft fin 

 pointed, when laid back extending to or beyond the middle 

 of caudal. Anal Vl-VllI 7-9. Pectoral |-4 the length 

 of head, extending to above the origin of anal ; ventral 

 extending to origin of anal or beyond. Caudal rounded. 

 Caudal })eduncle g-.] as long as deep. Olivaceous, with 6 or 

 7 dark cross-bars ; a dark spot at the base of caudal ; fins 

 dusky. 



Rio do la Plata ; Rio Grande do Sul. 



1. (158 mm.) J3uenos Ayres. Mr. White. 



2-8,9-11,12-14. (50-122mm.) Rio Grande do Sul. Dr. H.voulhering. 

 15-16. (132 & 152 mm.) Rio Parana. Mr. Salmin, 



4. Cichlosoma autochthon. 



Heros autochthon, Giinth. Cat. Fish. iv. p. 299 (1862) ; Kner, No vara 

 Fische, p. 265 (1869j ; Pellegr. Mem. Soc. Zool. France, xvi. 1903, 

 p. 235 (1904). 



Acara (Heros) autochthon, Steind. Sitzb. Ak. Wien, Ixx. 1874, p. 502, 

 pl.i. 



Depth of body about 2 in the length, length of head 

 about 2f . Eye much nearer to tip of snout than to extre- 

 mity of operculum, its diameter 3-3^ in the length of head, 

 interorbital width about 2^. Depth of prtEorbital g-| 

 diameter of eye. Maxillary not or scarcely extending to the 

 vertical from anterior margin of eye ; prsemaxillary processes 

 extending to above anterior ^ of eye ; lower jaw usually 

 slightly projecting ; fold of the lower lip continuous ; cheek 



