IG. SATANOPERCA. 313 



tion of the eye is situated in the posterior half of the head. Scales on 

 the cheek small, in six or seven series ; greater part of the operculum 

 naked. The spinous dorsal elevated, the length of the middle and 

 posterior spines being two-thirds of that of the head ; caudal scaly 

 superiorly and inferiorly, naked in the middle. A blackish spot at 

 the root of the caudal. 



Barra do Eio Negro. River Cupai. 



a, b, c. River Cupai. Purchased of Mr. Stevens. 



2. Satanoperca pappaterra. 



Geopbagus pappaterra, Heckel, I. c. p. 396. 



D. i|. A. |. L. lat. 32. 



Fold of the lower lip continuous in the middle. Scales on the 

 cheek in six series ; operculum scaly. A portion of the upper and 

 lower margins of the caudal covered with small scales. A black band 

 commences at the gill-opening, and is continued on over the upper 

 half of the caudal hn ; two blackish bands across the nape ; fins 

 immaculate. (Heck.) 



Rio Guapore. 



3. Satanoperca daemon. 



Geophagus daemon, Hccla-l, I. c. p. 389. 



D. j{. A. |. L. lat. 33. 



The fold of the lower lip is interrupted in the middle. Scales on 

 the cheek in eight series ; operculum scaly. The dorsal spines become 

 gradually longer posteriorly ; the U2)per and lower margins of the 

 caudal are a little scaly. A blackish spot in the middle of the upper 

 lateral line, another at its end ; a large ocellus at the base of the 

 caudal ; a black streak from the upper lij) to the angle of the pra3- 

 operculum ; three black cross-bands between the eyes. Dorsal with 

 oblique yellowish and blackish stripes. (Heclc.) 



Rio Negro. 



Size of a River-Perch. 



4. Satanoperca jurupari. 



Geophagus jurupari, Jleckel, I. c. p. 392. 



D. i^. A. f. L. lat. 30. 



The fold of the lower lij) is interrupted in the middle. Scales on 

 the check in six series ; operculum scaly. Dorsal .'opines e(iual in 

 height. The upper and lower margins of the caudal are a little scaly. 

 A small black spot superiorly at the root of the caudal ; a black streak 

 from the upper lip to the angle of the pnuopercidum ; three brownish 

 cross-bands between the eyes. Dorsal fin with white spots pos- 

 teriorly at the base. {Hfck.) 



Rio Negro. Amazon River. 



