358 Annals of the Carnegie Museum. 



gill-rakers on the first arch); the snout in the largest specimen as 

 long as the diameter of the eye; no distinct cross-bars; a lateral 

 band and a caudal spot; last dorsal spine one-half as long as the 

 head; no lines or stripes on the scales of the lower half of the body. 

 No. 2733C-C, 2-2.5 cm., Sao Antonio de Guapore (B. A. Maciel's 



rubber forest), Aug. 11, 1909. 



These specimens might equally well be placed under //. corumbce 

 Eigenmann and Ward. One has no signs of lateral scale-stripes, 

 one has faint signs of stripes, and one has stripes which resemble 

 somewhat those of H. corumbce. In some the lateral line is almost 

 wanting, while others have twelve or more pores independently of 

 whether there are lines on the sides, as in H. corumbce, or not, as in 

 11. tccniatiim. One of these specimens has two lateral spots on the 

 lateral line where it is intersected by the cross-bands. The most 

 of the specimens of this genus have black membranes between the 

 first two or three dorsal spines. 

 No. 2734C-J, 1.8-2.2 cm., Sao Antonio de Guapore, Rio Guapore, 



July 9, 1909. 



Twelve pores in the lateral line; caudal peduncle four-fifths to as 

 long as deep; snout shorter than the diameter of the eye. 

 No. 2735, Rio Tapajos at Santarem, Dec. 10, 1909. 

 No. 2736, 2.7 cm., Santarem, Dec. 15, 1909. 



A slender lateral band and faint cross-bands; caudal spot; barred 

 and spotted fins; all of the scales dusky-edged above and below the 

 lateral line, but there are no stripes like those in typical //. corunibcE. 

 No. 2737, 3.8 cm., Sao Luiz de Caceres, Rio Paraguay, May 27. 1909. 



Prolonged dorsal and anal rays; red and white spots with a pinkish 

 tinge on the vertical fins; a caudal spot and lateral band; bars below 

 the eyes and another from the eyes to the mouth; caudal peduncle 

 about seven-eighths as long as deep; snout about equal to the diameter 

 of the eye, which goes 3.5 times in the head, and is greater than 

 the interorbital space; depth of the preorbital about one-fourth the 

 diameter of the eye; depth 2.75 in the length; two or three gill-rakers 

 on the lower branch of the anterior arch; scales 2-23-7; pectoral fin 

 about as long as the head; three rows of scales on the cheeks and none 

 on the preopercuhim; last dorsal spine eight-thirteenths as long as 

 the head; maxillaries extending to below anterior third of the eyes; 

 D. X\T, 6; A. Ill, 6; membranes between the first dorsal spines 

 not black. 



