5. ACAEA. 281 



orbit (in specimens three and a quarter inches long) ; head half as 

 broad as long', and nearly as long as the body is high. Cleft of the 

 mouth subhorizontal, -vnth the jaws equal anteriorly ; the maxillary 

 extends to below the anterior margin of the orbit. A black spot on 

 the sides and a small one on the upper part of the base of the caudal. 

 (Heel:) 

 Eio Negro. 



10. Acara imiocellata. 



Chromys uniocellata, Casieln. Anim. nuuv. ou rares Am6r. Siul, Poiss. 

 p. 15. pi. 6. fig. 1. 



Scales on the cheek apparently in three series. Brownish, with a 

 black ocellus on the back of the tail. Sides Avithout spot. (Cast.) 

 TJcayale (Peru). 



11. Acara obscura. 



Chromys obscura, Custeln. Anim. tiouv. oh rares Amh\ Sud, Poiss. p. 14. 

 pi. 6. fig. 3. 



12 8 



Scales on the cheek apparently in three or four series. The height 

 of the body is a little more than one-half of the total length (without 

 caudal). Uniform dark-brown. (Cast.) 



Rio Paraguassu (Bahia). 



12. Acara (?) ucayalensis. 



Chromys ucayalensis, Castehi. Anim. tioiiv. ou rares Amer. Sud, Poiss. 

 p. 15. pi. 6. fig. 2. 



D.ii. A. A. 



• 13 10 



Scales on the cheek apparently in three series. Body immaculate, 

 vertical fins spotted. (Cast.) 

 Sarayacu. 



13. Acara dimerus. 



Heckel, Brasil. Fluss-Fische, p. 351. 



D.L^. A.^. L.lat..25. 



Scales on the cheek in two series ; the pra;orbital is not as wide 

 as the orbit (in specimens nearly four inches long) ; the greatest 

 breadth of the head is two-thirds of its length, which is less than 

 the height of the body. Body with darker cross-bands, with a black 

 lateral spot, and with another at the root of the caudal. (Heck.) 



River Cujaba. 



14. Acara nassa. 



Heckel, Brasil. Fluss-Fische, p. 35.".. 



D. ^. A. |. L. lat. 23. L. transv. ^. 



Three series of scales on tlie dieek. Pneorbital only half the 

 width of the orbit ; maxillary extending to behind the front margin 



