428 
BULLETIN OF THE UNITED STATES FISH COMMISSION. 
Distance of first dorsal spine from tip of snout, 2|- in length of body. First dorsal 
spine less than half the length of the second, the second from one-half to two-thirds j 
length of the third spine, which is the highest, 2} in head, the spines decreasing in 
height to the ninth ; the spinous and soft dorsals connected. Caudal in the young 
slightly emarginate ; in the adult emargiuate, the upper part truncate, lower rounded. 
First anal spine inserted uuder second dorsal ray, the spines graduated, the second 
strongest; highest ray 2 to 2^ in head. Ventral inserted below the base of lower pec- 
toral rays, the second divided ray longest, 2^ to If in head. Pectoral 2 to If in head. 
Scales of body of about uniform size, becoming very much smaller on breast and 
top of head. Scales strongly ctenoid on sides, becoming cycloid on head. 
Small scales on the caudal membrane at its basal third. Anal and dorsal without 
scales. 
Color olivaceous yellow, with peppery black dots, aggregated in spots on the back; 
the scales along base of dorsal and the upper half of caudal peduncle with a brownish 
spot at their base, spots forming more or less regular longitudinal lines ; membrane 
of soft dorsal with minute brownish dots, aggregated in places into rather large spots. 
Membrane of caudal dusky; anal with brownish dots along the middle of the mem- 
branes; pectorals and ventrals with similar, but fewer, spots. Head, 3| in length, to 
base of caudal ; depth, 4 to 4f . D. X, 11 or 1 2 ; A. HI, 8 to 10. Scales, 9-66 to 67-17. 
(C. H. E.) 
122. PERCICHTHYS LiEVIS. 
Perea Iwvis Jenyiis, Voyage of the Beagle, Fishes, I, pi. 1, 1840 (Rio Santa Cruz, Patagouia). 
Percichthys Iwvis Gunther, I, 61, 1859 (copied); Kner, Novara, Fische, I, 11 (Valparaiso). 
Habitat . — Rivers of Chili. 
Etymology. — Lcevis, smooth. 
This species is known to us chiefly from the figure of Jenyns and the description 
given by Kner. 
123. PERCICHTHYS MELANOPS. 
Percichthys melanojis Girsinl, Proc. Ac. Nat. Sci. Phila., 1854, 197; Girard, U. S. Nav. Astron. Exped., 
II, Zool., 233, pi. 30, figs. 1-5 (Rio Maypu, Chili) ; Giiiither, I, 61, 1859 (copied). 
Percosoma melanops Gill. Proc. Ac. Nat. Sci. Phila., 1860, 51 (copied). 
? Perea pocha Peters (description not seen by us). 
Habitat . — Rivers of Chili. 
Etymology. — l/^Aa<r, black ; appearance, from the dusky coloration. 
This species is known to us from descriptions only. 
PERCICHTHYS POCHA. 
In the museum at Cambridge are sixteen specimens from Curico, Chili. These are 
from 5 to 8 inches in length and bear the label Percichthys pocha. The following is a 
description of this species. (C. H. E.) 
Body ovate, deepest below first dorsal spine. Maxillary reaching scarcely to 
vertical from anterior margin of orbit, 3 in head. Teeth of lower jaw in a band 
widest near tip, and tapering to a single series behind ; some of the lateral teeth 
