41 



U. S. P. R. R. EXP. AND SURVEYS ZOOLOGY GENERAL REPORT. 



Br. VI : VI ; D XIX, 23 ; A 21 ; 0. 4, 1, 7, 8, 1, 6 ; V I, 5 ; P 19. 



The scales are more uniform than in C. const ellatus ; they are much smaller upon the opercular 

 apparatus and cheeks than in the latter species. The interopercle, snout, brarichiostegal appa- 

 tus, are smooth. The type of scales is the same as in the other species of this genus : ciliated 

 posteriorly, and furrowed upon the anterior section only. Those constituting the lateral lines 

 having no cilias ; and, besides, distinguishable by their pyriform outline, the attenuated ex 

 tremity being the posterior one. The ordinary scales are much longer than deep. There are 

 five lateral lines, as in the preceding species ; the uppermost is not quite so near the dorsal 

 line, and hence closer to the second. No marked differences are observed in their direction, 

 origin, and termination, except that in the fifth, the point of divergence begins at a little distance 

 behind the origin of the ventrals. The diverging curve is elongated. Small scales may be 

 seen upon the base of the caudal, dorsal, and pectoral fins. 



The ground color is dark brown above ; lighter beneath. Numerous vermillion spots, mar 

 gined with black, and varying in size, are distributed without system all over the body. The 

 dorsals and caudal fin are blackish brown, unicolor in the adult, blotched in the young. 

 The anal is bluish black, with a series of large vermillion spots. The ventrals are similarly 

 bluish black, but the spots are smaller. The base of the pectorals is brown, with three black 

 crescents ; exteriorly yellowish. 



References to the figures. Plate XX, fig. 1, represents CMropsis pictus, somewhat reduced. 

 Fig. 2 is a scale from the abdominal region. Fig. 3 a scale from the middle lateral line. Fig. 4 

 a scale from the dorsal region. 



List of specimens. 



3. CHIKOPSIS GUTTATUS, Grd. 

 PLATE XX, FIGS. 5-8. 



SPEC. CHAR. Dorsal fins contiguous. Caudal fin posteriorly sub-concave. Ground color olivaceous ; upper regions with 

 crowded small black spots ; fins blackish brown. 



SYN. Chirus guttatus, GRD. Proc. Acad. Nat. Sc. Philad. VII, 1854, 132. 



The body in its general outline is intermediate in form between C. constellatus and C. pictus, 

 though more like the latter in its general bearing, the dorsal and ventral outlines being more 

 arched. The greatest depth is somewhat greater than the length of the head and contained about 

 four times in the total length. The head is proportionally larger than in the two foregoing 

 species. The caudal fin, on the other hand, enters nearly seven times and a half in the total 

 length, as is the case in C. pictus. The eye is larger than in O. pictus, since its diameter is 

 contained but four times in the length of the side of the head. The supraocular flaps are 



