EIGENMANN: THE FRESHWATER FISHES OF BRITISH GUIANA 295 



Four specimens, 84-107 mm. Creek below Potaro Landing. (C. M. Cat. 

 No. 1854a; I. 17. Cat, No. 12142.) 



One specimen, 90 mm. Kangaruma. (C. M. Cat, No. 1855a.) 



Eight specimens, 65-122 mm. Erukin. (C. M. Cat. No. 1856a-&; I. U. Cat, 

 No. 12143.) 



Two specimens, 54-70 mm. Amatuk. (C. M. Cat, No. 1857a; I. U. Cat. 

 No. 12144.) 



Head 4-4.4; depth 4.5-5; D. 12; A. 10; scales 4-39 or 40-3.5. Eye 4 in 

 head, 1.5 in snout, 1.4-1.75 in interorbital. 



Slender; dorsal and ventral outlines about equally curved, the width 1.75 in 

 the depth; snout subcircular in section, turned upward slightly; mouth vertical, 

 the margin of the upper lip sloping backward slightly. A frontal fontanel extending 

 to above middle of the eye, the parietal fontanel obliterated, but the bones not united 

 in a specimen 115 mm. long. Four teeth in each premaxillary, the outermost one 

 four-lobed, the rest three-lobed; four teeth in each dentary, the outermost one 

 three-lobed, the middle ones bifid. 



Dorsal rounded, its highest ray 5.5 in the length, its origin nearer tip of adipose 

 than to snout; caudal deeply forked, the lobes nearly equal, about 4 in the length; 

 anal emarginate, the tip of the first ray reaching beyond the tip of the last; ventrals 

 reaching about half-way to anal; pectorals not quite half-way to middle of ventrals. 



Dark brown, with four light lateral bands, dull yellow in life, of which the two 

 median bands are much the most conspicuous, one reddish from the mouth to the 

 eve, which it margins dorsad, continuing to the upper caudal lobe, and one along 

 the lower margin of the eye to the lower caudal lobe ; of the less conspicuous bands 

 one begins at the middle of the eye, running along the first row of scales from the 

 median dorsal series, the other begins below the pectoral and extends to the anal. 

 There is a midventral yellowish stripe. Dorsal and caudal intense translucent 

 crimson, fading out toward the tips of the fins; indefinite spots of the same color 

 on the anal and ventrals. 



The color differs much in brilliancy and intensity in different individuals. 



153. Anostomus trimaculatus (Kner). (Plate XLI, fig. 2.) 



Schizodon trimaculatus Kner, "Familie der Characinen," i, 1859, 25, pi. 6, fig. 12 

 (Matto Grosso).— Cope, Proc. Am. Philos. Soc, XVII, 1878, 690 (Peruvian 

 Amazon). 



Anostomus trimaculatus Gunther, Catalogue, V, 1864, 304. — Garman, Bull. Essex 

 Inst., XXII, 1890, 17 (Gurupa). — Eigenmann and Eigenmann, Proc. U. S. 



