332 Annals of the Carnegie Museum. 



No. 2515, type, 14 cm., Santarcm, Dec. 7, 1909. 



No. 2516, cotypc, 13 cm., same place and date. 



D. XII, 22; A. Ill, 16; eye 4.16 in head, less than the length of the 



snout and one-half of interorbital space; depth 1.75 to 1.8 in length; 



si.x rows of scales on the cheeks; nares nearer the eyes than tip of 



snout; head 2.8 in length of body; dorsal spines subec]ual from the 



fifth, which is slightly more than one-third the length of the head; 



20—21 



scales 7-^1-16; pores ; caudal peduncle one-half as long as 



13-15 



deep. Both the specimens on the posterior edge of the operculum 

 have a fringe, which is orange in life and white in spirits, and the 

 fringe has two rows of dark spots in it; there is a similar but smaller 

 blotch above the base of the pectoral; four irregular black bands on 

 the sides, one of which in one of the specimens is broken and forms a 

 large black blotch in the region of the reilexed tip of the pectoral fin; 

 both have dark spots under the pectoral fin near the origin of the same, 

 and there are large ocellated caudal spots. The lateral bands are 

 broader and fewer and hence there is less orange pigment between the 

 bands than in A. ocellatus. The depth of A. ocellatiis is two or more 

 (more in all of my specimens'), while in this species it is not more 

 than 1.8. 



Genus iEquiDENS Eigenmann and Bray. 

 13. A. tetramerus (Heckel). 

 Nos. 2517C-C, 5-6 cm., San Antonio de Guapore, Rio Guapore, 



July 31 and Aug. 3, 1909- 

 No. 2518, 4 cm., Bastos, Rio Alegre de Guapore, June 26, 1909. 



Of these four specimens, two most closely resemble typical A. 

 tetramerus, one in some details resembles A. guaporensis, and No. 

 2518, which comes from the headwaters of the Guapore, is very 

 much like A. paragnayensis, and perhaps should be associated with 

 that species, even though the caudal peduncle is slightly longer. 

 As a rule, A. tetramerus grows to be larger than A. paragnayensis. 

 No. 2519, 10 cm., Braganga, Para, in a creek near salt water, Dec. 29, 



1909. 

 No. 2520, 13.5 cm., Santarem, Dec. 11, 1909. 

 No. 2521, 14 cm., Manaos, Nov, 27, 1909. 

 No. 25220-5, 4.8 and 9 cm., Corrego de Boa Ventura, headwaters of 



Rio Alegre, June 16, 1909. 

 No. 2523, 8.5 cm., San Joaquin, Bolivia, Sept. 4, 1909. 



