South- American Cichlid Genus Acara. 333 



rays of soft dorsal. Dorsal XTII-XV (XVI) 9-11, com. 

 niciu'iiig above the opereular eleft, the spines suhequal from 

 the fourth or slightly iuereasiiig in length to the last, which 

 is i-^ the length of head. Anal III 8-10. Dorsal and anal 

 fins scaleless. Pectoral at least as long as the head ; ventral 

 extending to origin of anal or beyond. Caudal rounded. 

 Caudal peduncle |-| as long as deep. Olivaceous, with 5 

 dark cross-bars, the first crossing the anterior 7 or 8 scales 

 of the lateral line, the second the 9th or 10th and 3 suc- 

 ceeding scales of the lateral line, below which it bears a 

 blackish blotch ; a dark spot below the posterior part of eye ; 

 a dark ocellated spot on the upper part of the base of caudal ; 

 usually a dark h)ngitudinal band from lateral blotch to 

 caudal spot, sometimes continued forward to the eye ; vertical 

 fins dusky, usually spotted. 

 R. Amazon ; Guiana. 



1-5. (90-181 mm.) S. America. Sir 11. Scliombuigk. 



6. (]12mm.) E.s.-eqiii bo River. Mr. Elnliardt. 



7. (110 mm.) 



8-10. (71-124 mm.) ('udajas. Mas. Comp. Zool. 



11-13. (81-96 mm.; Ciula'jas. Prof. A. Agassiz. 



2. Acara vittata. 



Acrtra vittata, Heck. Ann. Mus. Wien, ii. 1840, p. .346; Steind. Sitzb. 



Ak. Wien, Ixxi. 1875, p. 72, pi. iii. fig. 1. 

 Acara vittata (l-art.), Pellegr. Mem. Soc. Zool. France, xvi. 1903, p. 173 



(1904). 



Depth of body 21-2^ in the length, length of head 2^-2 1. 

 Snout shorter than postorhitul part of head. Diameter of 

 eye 3-3| in the length of head, interorbital width 2r-3. 

 Depth of pr^eorbital about equal to diameter of eye. Max- 

 illary extending nearly to below the anterior margin of eye; 

 jaws equal anteriorly; check with 3 series of scales; prae- 

 operculum scaleless ; 6 gill-rakers on the lower part of 

 anterior arch. Scales 24-26 I, 1 between lateral line and 

 anterior rays of soft dorsal. Dorsal XIII-XIV 10-11, com- 

 mencing above the opercular cleft, the spines snbcqual from 

 about the fourth to the twelfth, which are more than ? the 

 length of head, the last ^ the length of head ; soft fin ex- 

 tending nearly to middle of caudal. Anal III 7-8. Dorsal 

 and anal fins scaleless. Pectoral as long as the head ; ventral 

 extending to origin of anal or beyond. Caudal * rounded or 

 truncate. Caudal peduncle nearly as long as deep. Oliva- 

 ceous, with obscure darker cross-bars ; a dark longitudinal 



* Dr. Steindacliner has very kindly informed me that in adult males 

 the caudal is even slightly emarginate. 



