EIGENMANN: THE FRESHWATER FISHES OF BRITISH GUIANA 507 



Cotypes, eleven specimens, 22-37 mm. Konawaruk. (C. M. Cat. No. 

 2311a-/; I. U. Cat. No. 12470.) 



Cotype, one specimen, 32 mm. Savannah Landing. (C. M. Cat. No. 2353.) 



Cotypes, forty-five specimens, 22-66 mm. Erukin. (C. M. Cat. No. 2307a-z; 

 I. U. Cat, No. 12471.) 



One specimen, 31 mm. Rockstone. (C. M. Cat. No. 2458.) 



Head 2.66-3; depth 2.8-3.25; D. XV (rarely XVII), 7; A. 111,6, rarely 7; scales 

 22-24 in a median series, lateral line 12-14 + 6 or 7; eye 1.2 in the snout, 3.33 in 

 the head, .8 in the interorbital in the largest; 1, 3.25, .75 in the smallest. 



Elongate; snout pointed, mouth terminal; dorsal and ventral profile of the 

 head equally diverging from the median axis; maxillary not reaching to below 

 the eye; maxillary-premaxillary border equal to the snout, 3 in the head; teeth 

 in narrow bands, those of the outer series but little larger than the rest; width 

 of preorbital four-tenths of the diameter of the eye. Four rakers on the lobe of 

 the gills, about seven on the lower arch; caudal peduncle little deeper than long. 



Scales of the head inconspicuous, about three series on the cheek, none on 

 the preoperclc and interopercle; scales of the lateral line of the same size as those 

 above and below it; the fifth scale of the lateral line one and one-half scales from the 

 dorsal, the seventh one scale, the last half a scale from the dorsal. Dorsal and 

 anal entirely naked, a few scales at the base of the caudal. 



Pectoral shorter than the head; last dorsal spine a little more than half, and 

 middle spines about half, the length of the head; caudal rounded; dorsal and anal 

 prolonged into filaments, the former reaching past middle of caudal; ventral 

 filaments reaching soft part of anal. 



Sides with about six cross-bands; a dark band from snout to middle of caudal, 

 two to four narrow lines parallel with it on the lower part of the sides; one or two 

 of the lines below the lower margin of the pectoral; a dark band from below the 

 eyes down and back to the union of subopercle and interopercle; a black spot 

 across base of caudal; another back from eye across the nape; first two dorsal 

 spines bluish black; remainder of the spinous dorsal uniform dusky; last dorsal 

 and anal rays cross-barred; caudal in adult with seven dark cross-bands, disap- 

 pearing toward the margin, the bands less numerous in smaller specimens; a black 

 spot above the base of the upper pectoral ray; ventral spine and a spot at its base 

 bluish black. 



This species differs from H. corumbce, which it approaches in color, in the 

 much more pointed snout and the position of the dark lines below the dark lateral 

 band; in corumbce these are all above the lower margin of the pectoral. 



