472 BULLETIN 100, UNITED STATES NATIONAL MUSEUM. 
cludes the first row and a half of scales above the lateral line, and 
covers eight oblique rows (six in paratype) ; this spot is ocellated 
by a wide lighter band, which is immediately preceded and followed 
by rather indistinct aunies similar to those of related species. 
After an interspace three-fourths as long as the head, the dark spot 
is followed by the usual dark saddle, which in this species is quite 
indistinct. The head is lightly colored, with silvery reflections as 
on the sides of the body; the opercle is dusky; the margin of the 
branchiostegal membranes laterally is whitish. The buccal cavity 
and the upper two-thirds of the branchial cavity are lined with a 
dusky membrane; the parietal peritoneum is light purplish brown, 
blotched with darker and underlain with silvery. The first dorsal 
is mostly dark, but lighter near its base, and near the tip of the 
spine; the second dorsal is light; the anal fin has a dark margin, 
which is widest anteriorly. The pectoral fin is almost whitish, ex- 
cept on its upper margin; the ventral is dusky, with a blackish base. 
This interesting species is similar to the last one described, C. 
triocellatus, but differs notably in lacking the ventral fossa, in its 
plainer coloration, ete. It is also closely related to the next species, 
C. argus, from which it differs in the produced dorsal spine, in the 
broader snout with more convex sides, and in details in the squama- 
tion of the head. From both of these species, C. dorsalis differs 
also in its finer scales, there being 64 instead of 53 scales in a row 
between the origin of the second dorsal and the lateral line series. 
Measurements of type in hundredths of length to anus—Length 
of head, 76; length of orbit, 21; postorbital length of head, 24; width 
of interorbital, 17; width of suborbital, 9; distance from orbit to 
preopercular margin at angle, 28; length of snout, 32; length of 
upper jaw, 18; length of barbel, 3.7; depth of body, 39; width of 
body, 26; distance from center of anus to origin of anal, 9; distance 
from anus to base of outer ventral ray, 18.5; distance from base of 
outer ventral ray to isthmus, 22; height of second dorsal spine, 84; 
height of third dorsal ray, 51; length of first dorsal base, 16; length 
of interspace between dorsals, 20.5; length of pectoral fin, 40; length 
of outer ventral ray, 39; length of second ventral ray, 25. 
(dorsalis in reference to high dorsal fin.) 
30. COELORHYNCHUS ARGUS Weber. 
Coelorhynchus argus WerseER, Fische der Siboga-Expedition, 1913, p. 161, 
pl. 4, fig. 4 and 4a. 
We hesitate to refer our specimens to C. argus, as certain discrep- 
ancies between them and Weber’s description are difficult to explain. 
The orbit is never quite as long as the postorbital length of the head, 
as we measure these parts, either in our specimens or in Weber’s 
figure, but his measurements indicate the reverse. The interorbital 
