12 
BULLETIN OF THE UNITED STATES FISH COMMISSION. 
advance of pupil, 2* in head. Mandible slightly protruding. Teeth in narrow hands on jaws, vomer 
and palatines, the latter very weak, apparently concealed in part beneath the skin. Total interorhital 
width about two-thirds diameter of eye, shallowly concave. Occipital area flat or gently convex. Eye 
small, 1£ in snout, 5 in head. Pores on head unusually large, the most conspicuous occurring on 
suborbital ring, along mandible and preopercle, and in a horizontal line above opercle. 'three pores 
form a straight transverse line behind the orbits. A short nasal tube. The upper preopercnlar spine 
is represented by a short triangular process, the margin of the bone below it being smoothly rounded- 
Spinous dorsal short and comparatively very high, the longest spine slightly more than three- 
fourths the longest soft ray. The last spine is higher than the first and about four-fifths the longest, 
the least height of the membrane joining last spine to first soft ray exceeding length of snout. Longest 
ray of soft dorsal slightly more than half head. All the rays of dorsal and anal fins simple, unbranched. 
Caudal long and narrow, nearly truncate when spread, six-sevenths length of head. Nine caudal rays 
are branched at tip for about one-fifth length of rays. The pectoral reaches the vertical from fourth 
ray of soft dorsal. The upper ray is simple, the next six or seven forked, the remaining rays being 
simple, thickened, with incised membranes. Yentrals with 1 spine and 4 rays, not reaching vent, If 
in head. 
Lateral line conspicuous anteriorly, running high, interrupted under eleventh or twelfth ray of 
soft dorsal, a mere trace visible thence to base of caudal. Sides of body thickly covered with coarse 
prickles, the head, breast, belly, and a narrow strip along base of anal fin naked. 
Color light brownish, faintly vermiculated with darker, with traces of five irregular cross-bars 
from back, and a narrow distinct bar at base of caudal. Pectorals, dorsal, and caudal cross-barred. 
One specimen, 59 mm. long, from Lost Kiver, near Klamath Falls, Oregon. 
Named for Dr. Barton W. Evermann, the energetic investigator of American fresh-water fishes. 
Cottus princeps Gilbert, hew species. Drawn by Anna L. Brown from the type (No. 48227, TJ. S. N. M.) from Upper 
Klamath Lake. 
15. Cottus princeps, new species. 
Type, No. 48227, U. S. Nat. Mus. Type locality, Upper Klamath Lake, Oregon. (Gilbert, Cramer, 
and Otaki, collectors.) 
Head 3£ to 3| in length ; depth 5 to 5*. D. vi or vn, 21 to 23. A. 16 to 18. Y. i, 4. P. 15. 
A slender form with small narrow head, which is nearly quadrate in cross-section, the opercles and 
cheeks being subvertical, the greatest width of head but one-fifth or one-sixth more than its depth at 
occiput. Mouth small, oblique, the gape slightly curved, the maxillary reaching a vertical crossing 
eye in front of pupil, 2J to 3 in head. Eye equaling snout, 4J in head. 
Teeth small, uniform, in narrow bands in the jaws. Vomer with a narrow patch; palatine 
smooth. Eye small, separated by a narrow, flat interspace, as wide as pupil. Margin of preopercle 
evenly rounded, without developed spine, a minute spinous point sometimes occupying the position 
of the upper preopercular spine. Opercle without spine. Tubes and pores of head extraordinarily 
developed. A series of six very large pores across cheeks and on lower edge of preorbital. A large 
median pore at symphysis, and a series of seven occupying each ramus and extending onto edge of 
preopercle. Similar, somewhat smaller, pores form the supraorbital series. Branchiostegals 6. Gill 
membranes broadly united to the isthmus, without free fold. No pore behind last gill. 
Dorsal and anal fins very long and low, the dorsal spines very slender, the notch shallow between 
spinous and soft portions. Pectorals reaching beyond front of anal; ventrals usually to vent. 
About two-thirds of our specimens have the back and sides completely invested with minute 
close-set prickles, the head and belly and a narrow area along base of anal naked. The caudal 
peduncle is also naked in varying degree. In the remaining third (possibly males) the body is 
