280 CHKOMIDES. 



6. Acara pulchra. 



Cvchlasoma piilchrum, Gill, Freshwater Fish. Trinid. in Ann. Lye. Nat. 



'Hist. New York, 1858, sep. cop. p. 22. 

 Chromis rivulata, Gdnth. Proc. Zool. Soc. 1859, p. 418. 



D. if. A. |. L. lat. ^8. L. transv. 3/9. 



Four (in young specimens three) series of scales on the cheek ; 

 priEorbital wider than the eye in adult specimens, and as wide as the 

 orbit in young ones ; the greatest breadth of the head is contained 

 once and foiu'-fifths in its length. Cleft of the mouth veiy slightly 

 oblique. A black spot on the middle of the sides ; no caudal spot ; 

 sides of the head with oblique bluish hues, which are replaced by 

 spots of the same colour on and behind the opercles. Young specimens 

 with distinct dark cross-bands, and with a dark spot below the orbit. 



Trinidad. Western Ecuador. 

 a. Five and a half inches long. "Western Ecuador. From Mr.Fraser's 



Collection. 

 b-d. Half-grown and young. "Western Ecuador. From Mr. Eraser's 

 Collection. 



7. Acara dorsigera. 



Heckel, Brasil. Fluss-Fische, p. 348. 



D. i^. A. |. L. lat. 24. 



Three series of scales on the cheek ; praeorbital half as wide as 

 the orbit (in specimens two inches long) ; the greatest breadth of 

 the head is two-thirds of its length, which is contained once and a 

 quarter in the height of the body. A blackish band runs from the 

 eye to the lateral spot ; there is another black spot above the latter, 

 on the eighth to ninth dorsal spines. Caudal spot none. Caudal and 

 posterior part of the soft dorsal dotted with white. (Heel:) 



Paraguay. 



8. Acara viridis. 



Heckel, Brasil. Fluss-Fische, p. 343. 



D.|^. A.f L. lat. 26. 



Three series of scales on the cheek ; praeorbital as wide as the orbit 

 (in specimens five and a half inches long) ; the greatest breadth of 

 the head is two-thirds of its length. Cleft of the mouth horizontal. 

 Brownish, with six darker cross-bands ; a seventh round the free 

 portion of the taU ; a black spot on the middle of the sides ; another 

 smaller one superiorly at the root of the caudal ; a light streak be- 

 tween the eye and nostril. Fins immaculate. {Heck.) 



Ditches near the town of Matagrosso. 



9. Acara pallida. 



Heckel, Brasil. Fluss-Fische, p. 347. 



D. f^. A. |. L. lat. 26. 

 Three series of scales on the cheek ; prtcorbital half as wide as the 



