282 CHKOMIDES. 



of the eye; lower jaw prominent. Coffee-brown, with a black spot 

 on the middle of the sides, and with another at the root of the caudal. 

 A black spot below the orbit, and another edged with bluish on the 

 angle of the praeoperculum. 



Presh waters of Brazil and Guiana. 



a. Fine specimen. Kiver Cupai. Purchased of Mr. Stevens. 



Acara cognatus, Heckel, I.e. p. 356, and Acara unicohr, Heckel,?.c. 

 p. 357, the latter without any markings, are probably identical with 

 A. nassa. 



B. Scales on the cheek in more than iive series. 



15. Acara adspersa. 

 D. j|. A. |. L. lat. 31. L. transv. 6/13. 



The fold of the lower lip continuous in the middle ; six series of 

 scales on the cheek. The height of the body is two-fifths of the total 

 length (without caudal). Only a narrow strip of the base of the soft 

 dorsal is scaly. Brownish-olive, dotted all over with black. 



Barbadoes. 



a. Eight inches long. Presented by Sir R. Schomburgk. 



Description of the specimen. — The height of the body is two-fifths 

 of the total length (the caudal not included), the length of the head 

 somewhat more than one-third. Head as high as long, with the upper 

 profile of the snout straight, that of the nape being strongly convex. 

 Snout compressed, large, its extent being two-fifths of the length of 

 the head. Cleft of the mouth oblique, not extending to below the 

 anterior margin of the eye, with the jaws equal anteriorly. Prse- 

 orbital nearly as wide as the interorbital space, and much wider than 

 the orbit. The eye is situated m the middle of the length of the 

 head, near the upper profile ; its diameter is one- sixth of the length 

 of the head. Space between the orbits convex. Scales ctenoid; those 

 on the cheek small, in six horizontal and seven vertical series. 



Only a veiy narrow portion of the base of the vertical fins is 

 scaly. Dorsal spines moderately strong, the length of the twelfth 

 being one-fourth of that of the head ; the middle of the soft dorsal 

 and anal are prolonged into a very long filament ; caudal rounded. 

 Pectoral rounded, equal in length to the distance of the snout from 

 the posterior margin of the eye. Ventral with the outer ray prolonged 

 into a filament reaching to the anal papilla. 



Brownish- olive, dotted all over with black, except on the pectoral, 

 ventral and anal fins, which are immaculate. 



16. Acara fusco-maculata. 



Centrarchus tetracanthus, Cuv. Sf !"«/. vii. p. 460. 

 Chromis fusco-maculatus, Guich. in Ramon dc la Saqra, Hist. Cuba, 

 Poiss. p. 78. pi. 2. fig. 3. 



D.i|. A.|. L. lat. 31. L. transv. 6/11. 



The fold of the lower lip continuous in the middle ; seven series of 

 scales on the cheek. The height of the body is two-fifths of the total 



