INVESTIGATIONS IN THE COLUMBIA RIVER BASIN. 
203 
Description : He.'irl, 3j ; deiitli, It ; eye, 4 ; snout, 4 ; in ter orbital width, 5L D. vii, 21 ; A. 15 ; 
P. 16; V. I, 4. Least depth of caudal peduncle greater than snout, 3f in head; interorbital 
■sirace rather broad, about 1^ in eye. 
The body is deeper and more compressed than in any other species known to ns, this being 
especially noticeable posteriorly; the caudal jieduucle is verj- short and deej), and is entirely 
overlap2)cd by the ]iosterior dorsal rays which extend beyond base of caudal tin. Length of 
■caudal peduncle from base of last dorsal ray aliout f depth of same. Depth of body at origin of 
anal tin length of head. Interorhital space slightly concave; occiput flat or transversely 
convex. Mouth obli(pie, the maxillary reaching vertical from ]>osterior margin of pupil, 21 in 
head. Teeth in a. very narrow crescentic l)and on vomer, none on palatines. Upper preo])er- 
cular spine short and broad, curved or simply directed upward; i)elow this two stout, blunt 
spines directed downward. Body, in the tyi>e specimen, entirely naked; lateral lijie incom- 
l^lete, not reaching end of soft dorsal. 
Spinous dorsal low, the longest spines not greater than length of snout ; soft fins all high, 
the 15th dorsal ray eipral to snout and eye ; a broad membrane always connecting the two dorsals, 
the notch inconspicuous. Last rays of anal as well as dorsal extend beyond base of caudal; 
first anal ray under third ray of soft dorsal ; ventral spine and rays slender and weak. Anus 
midway between base of caudal fin and front of eye. 
Color in alcohol, back and sides with verniiculations of light and dark, the back with 5 or 6 
ill-defined black crossbars, which usually roach the lateral line; the usual black bar at base 
■of caudal, emargiuate posteriorly; below the lateral Hue a number of small, quadrate, dark 
blotches, arranged in two irregular series ; lower parts unmarked except with fine dark punctu- 
lations; dorsal, pectoral, and caudal fins crossbarred with dark; anal and v'entrals with 
numerous small dark specks. Length, 91 mm. 
The co-types show that this species is subject to some variations whicli should be men- 
tioned. Head, 3 to 31 ; depth, 4i to 4L D. vii or a iii, 18 to 21 ; A. 14 to 16 ; 1'. 14 to 16. While the 
body is usually entirely naked, there is occasionally an axillary band of prickles, sometimes 
■supirlemented by a single irregular series of prickles along base of the dorsal fin. The notch 
in the membrane connecting the dorsals is usually inconspicuous. In some exanqrles the black 
crossbars on the back do not reach the lateral line. The small, quadrate, dark blotches below 
the lateral line are sometimes arranged in a single series iiarallel witli base of anal, sometimes 
in two irregular series. 
The following table gives the fin formula in a number of individuals of this species: 
Locality. 
Dorsal spiues. 
Dorsal rays. 
Anal rays. 
Xo. of 
speciineii.s 
examined. 
A’ll. 
A’lII. 
18 
19 
20 
21 
It ■ 15 
IG 
Skookumclmck River 
3 
10 
4 
5 
0 
6 0 
1 
13 
3 
0 
2 
0 
1 
1 3 
1 
26 
Natchess River 
4 
1 
1 
3 
1 
2 2 
1 
5 
From Coitus puncUdaius, which it most closely resembles, this species may l>e distinguished 
by its deeper body, more elongate anal fin, the broad union between the dorsals, the absence 
of palatine teeth, and the different coloration. 
35. Cottus leiopomus s^i. nov. {Adog, smooth; cover, oijercle. ) (Plate 20.) 
Type locality : Uiiper Little Wood Rir^er, Shoslione, Idaho, where 2 specimens were col- 
lected, September, 189.3, by Mr. H. H. Kinsey. Type, No. 45389, Ih S. Nat. Mus. Co-type, 
No. 1151, Museum Leland Stanford Junior Unir'ersity. Related to Coitus phdouijis. 
Head, 34 ; depth, 54; eye, 4| ; snout, 3^ ; interorhital width, 7-] ; I>. vii-17 ; A. 12; P. 13; V. 
1,4. Least deiith of caudal peduncle about equal to length of snout; interorhital space very 
narrow, much less than diameter of eye ; mouth small, m, axillary }'eaching vertical from middle 
of eye, a wide strip vHsible laterally in the closed mouth. Preopercular spines entirely absent, 
the preopercular margin eveidy rounded throughout, without prominence, and Avithout the 
least trace of a spine. 
