\ 
978 7 FISHES—PEROCID 2. 
than in the males; dorsal and anal spines pointed in the female, ‘ts the male with 
thickened, fleshy tips; scales moderate; lateral line extending about to end of first 
dorsal; neck and threat naked; scales on sides extending up to the base of the dorsal 
fin; color dark, each scale with a dark spot, these forming a series of conspicuous lon- 
gitudinal lines along the rows of scales; second «orsal and caudal conspicuously cross- 
barred; head blackish, with dark stripes radiating from eye; males further marked 
with conspicuous dark cross-bars ; a black humeral spot; head 4; depth 5; D. VIII, 12; 
A. II, 8; scales 7-53-7. Length 24 inches. 
Habitat, New York, Lake Erie, and Ohio Valley. Very abundant eastward. 
Diagnosis.—The stort, low dorsal, and the projecting lower jaw, distin- 
guish this species from.all others in Ohio. 
Habits —This species is very abundant in Western New York and 
Pennsylvania, swarming on the bottom of every clear and rocky stream. 
It isan active and hardy little fish. It is found throughout the Ohio 
Valley, but seems to be less abundant westward (Wisconsin and Illinois). 
In the Northwest occurs a closely related species or variety, Htheos- 
toma lineolatum (Agassiz), “istinguished by the presence of series of very 
distinct, black, lengthwise stripes made of, black dots. 
150. ErarostoMA £QAMICEPS Jordan. 
 Etheostoma squamiceps, JORDAN, Bull. U. S. Nat. Mus., x, 1877, 11; Man. Vert., 2d Kd., 
1878, 228. 
Description. Body rather elongate, considerably compressed, the caudal peduncle 
deep; head large; the jaws comparatively short, and equal; lateral line wanting only 
on about ten of the posterior scales, and with cecasionai tubes behind the continuous 
series; spinous doisal.low and short, the spines about equal, less than half the height 
of the second dorzal; bases of the two dorsals about cqual, slightly connected by 
membranes; color dark, without spots, stripes, or bands in spirits; female mottled, 
with about six cross blotches; vertical fins cross-barred; lwer fins black in the male, 
pale in the female; a large black humeral spot; head 31-5; depth 5; D. IX, 12; A. IL, 
7; scales 5-50-6. Length 22 inches. 
Habitat, Ohio Valley; the known specimens being from Russellville, Kentucky, and 
from New Harmony, Indiana. Nothing is known of its habits. 
GENUS 81. PQC®CILICHTHYS. Agassiz. 
Pecilosoma, AGAssiz, Lake Superior, 1850, 299 (name preoccupied). 
Pecilichihys, AGass1z, Amer. Journ. Sci. Arts, 1804, 305. 
Oligocephalus, GIRARD, Proc. Acad. Nat. Sci. Phila , 1859, 67. 
Aplesion, GIRARD, Proc. Acad. Nat. Sci. Phila., 1859, 102 (not of Rafinesque). 
Astatichthys, VAILLANT, Recherches sur Poiss. Eau Douce., Amer. Septent., Etheostom.. 
1873, 106. 
Type, Etheostoma cerulea, STORER. 
Etymology, poikilos, variegated ; ichthus, fish. 
