496 MEMOIRS OF THE CARNEGIE MUSEUM 



Centrarchus cyanopterus Schomburgk, Fishes Brit. Guiana, II, 1843, 165 



(Essequibo). 



Eight specimens, 84-148 mm. Pacopoo Pan. (C. M. Cat. No. 2290a-e; 

 I. U. Cat. No. 12460a-e.) 



One specimen, 145 mm. Lama Stop-Off. (C. M. Cat. No. 2409.) 



Eleven specimens, 84-200 mm. Botanic Garden. (C. M. Cat. No. 2291a-c; 

 I. U. Cat. No. 12461.) 



Five specimens, 80-103 mm. Twoca Pan. (C. M. Cat. No. 2292o-c; I. 

 U. Cat. No. 12462.) 



Sixty-five specimens, 22-148 mm. Georgetown trenches. (C. M. Cat. No. 

 2293a-./; I. U. Cat. No. 12463.) 



Two specimens, 67-76 mm. Chipoo Creek. (C. M. Cat. No. 2354a; I. U. 

 Cat. No. 12501.) 



Head 2.8-3; depth 2; D. usually XV,11, rarely XVI, 10; A. IV,8 or 9. Scales 

 24 to 25 in a median series. Eye 4 in the head, 2 in the interorbital (2.5 + 1 in 

 young), in advance of the middle, of the head. 



Oval, heavy forward, the interorbital broad, the snout blunt; mouth small, 

 maxillary not extending to below origin of eye; prcmaxillary-maxillary border 

 about 3.5 in the head; outer teeth large, conical, increasing in size forward; inner 

 teeth much smaller, in narrow bands; preorbital .6-.S in the eye; about seven 

 gill-rakers on the lower arch, all of them small, the anterior minute; caudal peduncle 

 about two-fifths as long as deep. 



Three or four rows of scales on the cheek; scales regular, those of the lateral 

 line similar to those above and below it; bases of the membranes of the dorsal 

 and anal with three or four scales, one and one-half scales between end of lateral 

 line and dorsal. 



Pectorals about reaching to above origin of the anal; dorsal spines increasing 

 rapidly to the fifth spine, then more gradually to the last, which is nearly half the 

 length of the head; caudal rounded. Soft dorsal and anal sometimes prolonged 

 to the end of the caudal; first ventral ray prolonged into a filament reaching beyond 

 origin of anal. 



Becoming dark with age; a large spot on the base of the upper caudal rays, 

 vermiculations below it; a black spot near the middle, a dark line extending for- 

 ward from it to the gill-opening or to the eye; about eight obscure cross-bands; 

 each scale of the lower part of the sides of the anterior half of the body with a 

 silvery spot, those of the posterior half with a dark spot; a dark spot below posterior 

 part of eye. End of soft dorsal, caudal, and end of anal with hyaline spots or bands. 

 Sometimes irregularly blotched with black. 



