eigenmann: the FRESHWATER FISHES OF BRITISH GUIANA 515 



Three specimens, 112-235 mm. Botanic Garden. (C. M. Cat. No. 2246a; 

 I. U. Cat, No. 12423.) 



Two specimens, 103-195 mm. Barima. (C. M. Cat, No. 2247a; I. U. Cat. 

 No. 12424.) 



Ten specimens, 63-1 IS mm. Issorora. (C. M. Cat, No. 2248a-fc; I. U. Cat. 

 No. 12425.) 



Four specimens, 78-135 mm. Koreabo. (C. M. Cat. No. 2249a-6; I. U. Cat. 

 No. 12426.) 



Six specimens, 68-168 mm. Aruka. (C. M. Cat. No. 2250a-c; I. U. Cat. No. 

 12433.) 



Two specimens, 122-125 mm. Cluck Island. (C. M. Cat. No. 2267a; I. U. 

 Cat. No. 12430.) 



.Twenty-six specimens, 45-135 mm. Lowlands of Guiana. 



Three specimens, 57-152 mm. Wismar. (C. M. Cat. No. 2251a-6; I. U. 

 Cat, No. 12427.) 



Two specimens, 75-90 mm. Christianburg. (C. M. Cat. No. 2252a; I. U. 

 Cat, No. 12428.) 



Three specimens collected by Ehrhardt in the Essequibo, and now in the Berlin 

 Museum, are evidently also of this species. 



Head 3-3.25; depth 4-5.5; D. usually XVIII, 14 ; 84 A. 111,9 or 10. Scales in a 

 series below the lateral line most frequently 55-61, rarely 52 and 62; eye 1 in the 

 snout, 4 in the head, .7 in the interorbital in the young; 1.5 in the snout, 4.75 in the 

 head, 1.5 in the interorbital in the adult, 



Nares considerably nearer the eye than to the tip of the snout; maxillary 

 extending beyond origin of the eye; scales cycloid on head, belly, and above the 

 lateral line in front, elsewhere ctenoid; dorsal sometimes produced to the end of 

 the rounded caudal. 



Humeral spot entirely below the lateral line; a band from the eye to the 

 humeral spot and frequently forward to the chin; a caudal spot at the base of the 

 rays above the middle; sides frequently with white or light blue spots, which form 

 an incomplete ring around the caudal and humeral spots; dorsal and anal spotted 

 with white (especially towards the end); a black spot below the eye; caudal some- 

 times faintly barred, sometimes narrowly margined with white, often with a dark 

 submarginal band, within which on the upper lobe there may be a series of white 

 spots or a white band; back with about eight to ten obscure cross-bands; young 

 with a faint, dark lateral band. 



84 Of thirty-eight specimens, four have 17, twenty-five have 18, nine have 19, and one has 20 spines; seven 

 have 13, twenty-three have 14, and nine have 15 rays. 



