334 Mr. C. T. Regan on the Fishes of the 



band from eye to end of soft dorsal ; a dark vertical stripe 

 below the posterior margin of eye ; a dark spot on the upper 

 part of the base of caudal ; vertical fins with dark spots. 



Guiana; R. Amazon; R. Paraguay. 



The examples described by Steindachner measure up to 

 about 130 mm. in total length. 



3. Acara syspilus. 



Acara sr/spiltis, Cope, Proc. Ac. Pbilad. xxiii. 1872, p. 255, pi. xi. 



fig. 3. 

 Acara vittata (part.), Tellegr. M^m. Soc. Zool. France, xvi. 1903, 



p. 173 (1004). 



Depth of body 2^2| in the length, length of head 2|. 

 Snout a little shorter than postorbital part of head. Dia- 

 meter of eye 3j in the length of head and equal to the inter- 

 orbital width. Depth of praeorbital f the diameter of eye. 

 Maxillary extending to the vertical from anterior margin of 

 eye; lower jaw slightly shorter than the upper; fold of the 

 lower lip not continuous ; cheek Avith 3 series of scales ; prre- 

 operculum scaleless ; 5 or 6 gill-rakers on the lower part of 

 anterior arch. Scales 26-27 ^,^\ between lateral line and 

 base of anterior rays of soft dorsal. Dorsal XIV-XV 9-10, 

 commencing above extremity of operculum, the spines sub- 

 equal from the fourth or fifth to the twelfth or thirteenth, 

 which are |-g the length of head ; last spine from i to nearly 

 \ the length of head ; soft fin extending nearly to middle of 

 caudal. Anal III 7 (8). Dorsal and atial fins scaleless. 

 Pectoral as long as the head ; ventral extending to origin of 

 anal or beyond. Caudal subtruncate. Caudal peduncle 

 |-i as long as deep. Olivaceous, with about 7 darker cross- 

 bars and with a dark longitudinal band from eye to end of 

 base of dorsal ; a dark vertical stripe below the posterior 

 part of eye ; vertical fins dusky, with darker spots, which 

 are most distinct on the soft dorsal. 



Upper Amazon. 



1-3. (95-101 mm.) Canelos. C. Buckley, Esq. 



I have little doubt that these specimens belong to the 

 species which Cope founded on very young specimens and 

 which appears to differ fi'om A. vittata in the more slender 

 body, longer snout, narrower interorbital space, and less 

 elevated spinous dorsal. 



