NATURAL SCIENCES OF PHILADELPHIA. 253 



1.33 times to 1.6 times in interorbital breacltli. Scales 4 — 5G-3' — 12 

 13, seven rows on cheek. Color olivaceous, blackish above; fins 

 dusk}', without markings, except a black ocellus at upper base of 

 caudal fin, with pale margin. A dusky band from end of muzzle 

 to middle of side, and dusky spot below eye. Eye red. Total 

 length .11 m. 



Var. a. — Shorter and stouter, colors paler. Eye 1.5 times in 

 interorbital width. Depth of body 3| to 4 times in length less 

 caudal. Scales 4 — 45-8 — 13. Pattern of color similar to the last. 

 Several specimens. 



Vai\ |8. — More slender; depth 4.66 times in length without 

 caudal fin. Radii xviii-14; A. iii-9. Scales 4-55-13. Diameter 

 of orbit equal interorbital space. Coloration as in the types, ex- 

 cept a large black spot marking the posterior fourth of the spinous 

 dorsal fin. This variety has one less dorsal spine than usual in 

 the type, but the latter occasionally exhibits but 18. 



Var. y (argynnis). — Short and stout as in var. a, but the 

 orbit is as wide as the narrowed interorbital space ; scales 4-43- 

 13. Radii D. xix. 13; A. iii. 9. The coloration is like that of the 

 type, olive, darker above, with caudal ocellus and dusky band 

 from muzzle to opercular margin. The dorsal fin has, however, a 

 broad orange-red band extending along its distal posterior half, 

 the anterior part wider and with three large black spots in the 

 centre ; in a second specimen it contains four black spots. 



The preceding varieties are so connected together as to be in- 

 separable in our system. The var. |3 accords to some extent with 

 Castelnau's description of his C. laciistris, but our most slender 

 forms ai'e less elongate than this species, where the depth is one- 

 sixth the length. There are neither black dots nor vittaj in the 

 C. proteus. From C. saxodlis^ to which it is next allied, it dif- 

 fers in the constantly smaller number of longitudinal scales, which 

 are given by Giinther as j\. 



TJARUS INSIGNIS, HeckeL 

 Mesonauta insignia^ Gihitlier, 1. c. iv. 300. 



UARUS CENTRARCHOIDES, Cope, sp. nov. 



Form a compressed broad oval. Scales ctenoid t — 20-20 — 14, 

 five series on the cheek ; operculum scaled. Radii D. xv-14 ; anal 



• Not counted on lateral line. 

 1872.] 



