NATURAL SCIENCES OF PHILADELPHIA. 255 



ACARA TETRAMEEUS, Heckel. 

 Giintlier, Catal. iv. 277. 



ACARA SYSPILUS, Cope, sp. nov. 



Scales in three series on the cheek, on the body 2-26-1. Radii 

 D. xiv-xv. 9 ; A. iii. 8 ; caudal rounded. Form elongate oval ; 

 depth of body 2.6 times in length without caudal fin, and equal 

 depth of head. Preorbital bone half orbit (in specimen two inches 

 long) ; orbit 2.5 times, head nearlj^ twice interorbital space 

 (doubtless much smaller in larger specimens). Profile convex; 

 muzzle oblique; upper lip longer than mandible. 



Light brown, yellow below. A straight wide black band from 

 the upper posterior margin of the orbit to below the end of the 

 spinous dorsal, composed of three confluent spots; a black bar 

 from eye to angle of preoperculum, and another across the base 

 of the caudal fin. Seven vertical brown cross shades behind the 

 head, on sides. 



ACARA FIAVILABRIS, Cope. 



Proc. Amer. Phil. Soc, 1870. 



Scales in two series on cheek; on body 2-24-8. Radii P. xvi. 

 9-10; A. iii. T. Depth 2.25 times, head 2.8 times in length less 

 caudal fin. Eye three times length of preorbital bone, and 2.6 

 times in head in specimen 2.5 inches long, jaws equal. Seventh 

 dorsal spine as long as diameter of orbit or interorbital width. 

 Profile gently convex, inferior outline rising to meet it. 



Olive, with jointed unpaired fins yellow. A large black spot 

 before middle of side on lateral line, a vertical shade at base of 

 caudal. 



As compared with A. dimerus, its closest ally, this fish differs 

 in the fewer anal radii, the lack of cross-bars, etc. It was origi- 

 nally described by me as having three rows of cheek scales ; but 

 those of the interoperculum were included. 



ACARA FRENIFERUS, Cope, sp. nov. 



Scales of cheek in two series; of body 2 — 29-8 — 9. Radii D. 

 xvi. 10-11; A. iii. 8. Form elongate oval, the depth entering the 

 length (less caudal) 2.33 times. Front convex, descending, length 

 of head one-third length. Orbit equal muzzle 3.33 times in head, 

 1.5 times in the flat front. Dorsal spines short, twelfth equalling 



1872.] 



