REVIEW OF THE SERRANID^. 
427 
aa. Braachiostegals, 6 ; bones of lower part of head still more cavernous ; caudal peduncle shorter 
and deeper. 
c. [Caudal peduncle moderately long ; opercular spine strong ; maxillary reaching just past front of 
pupil; snout long, blunt in profile; soft dorsal and anal high, much higher than spinous 
part; second dorsal spine highest, about 2i in head ; second anal spine longer than third ; 
color yellowish brown, covered all over with small spots, one occuiiying the base of each 
scale. Head 2^ in length; depth, ,3f. D. IX-I, 11; A. Ill, 9. Scales, about G5.] (Jen- 
yns. ) LiEViS, 122. 
cc. [Caudal peduncle short and thick; opercular spine small ; maxillary reaching front of eye. Color 
whitish, minutely and densely dotted with black, the dots crowded in a blotch on the center 
of each scale. D.X-I, 10; A. Ill, 9. Scales, 10-59-22. ] (Girard.) Melanops, 123. 
121. PERCICHTHYS TRUCHA. 
(Truck A of Chili.) 
Perea trucha Cuv. & Val., IX, 429, 1833 (Rio Negro, Patagonia); Gnichenot in Gay, Historia de Chile, 
Zool., II, 146, pi. 16, f. 1 (Chili) ; Girard, Proc. Ac. Nat. Sci. Phila., 1854, 197. 
Perciclitliys chilensis Girard, U. S. Nav. Astrou. Exped., II, Zool., 231, pi. 29, f. 1-4 (Chili) ; Gunther, 
I, 61, 1859. 
f Perea segethi Peters (description not seen by us). 
Habitat. — Eivers of Ghili. 
Etymology. — Trucha., the Spanish name, meaning trout (low Latin, trutta). 
We know this species from a single specimen sent from the Museum of Compara* 
tive Zoology, and from others iu the museum at Cambridge. 
The following description is taken from specimens in the museum at Cambridge, 
labeled, whether correctly or not, Percichthys trucha. These specimens are No. 4836, 
M. C. Z., Santiago, Chili (ten specimens, 5 to 11 inches in length), and No. 10372, M. C. 
Z., Curico, Chili (two specimens, 8 and 9 inches long). (C. H. E.) 
Body oblong, deepest below first dorsal spine ; maxillary reaching to below an- 
terior half of pupil, to 3 in head. Maxillary and mandibulary teeth in similar bands, 
broadest in front and tapering backwards; a few of the inner teeth in front of lower 
jaw slightly enlarged, the rest subequal ; teeth bn vomer iu a triangular patch ; pala- 
tine bauds of teeth much longer than those on vomer, separated from the latter, 
and placed almost at right angles with them. Head covered with scales forward to 
the anterior nostril, a short linear naked area, always present, at or near the base of 
the supra-occipital keel. Scales on cheeks in twelve to fifteen irregular series; scales 
on opercle as large as those on body, in about six series. Eye large, 1| to If in snout, 
5 to 5f in head ; about equal to inter orbital space. Mouth subterminal, the lower jaw 
slightly included. Profile straight, from tip of occipital process to premaxillary pro- 
cesses, then abruptly decurved. 
Preorbital with strong teeth directed downward and backward, strongest in 
young examples, largest near posterior angle of maxillary ; entire vertical margin of 
preopercle with fine teeth, largest below ; lower margin of preopercle with larger, wider- 
set teeth, the anterior ones directed forward ; posterior half of free edge of interopercle 
and lower half of subopercle with very fine teeth, which become more or less obsolete 
with age ; opercle with a strong spine and a blunt or rounded point above it. 
Gill rakers short, chubby, about two thirds the length of the pupil, 6-1-13; inner 
side of the gill-rakers covered with short, stout teeth. 
