70 
BULLETIN OF THE UNITED STATES FISH COMMISSION. 
The Klamath Lake Catostomus has been identified, by all who have had occasion to mention it, with 
C. labialus Ayres, upon the supposition that the type of Ayres’s species came from Klamath Lake. But 
Ayres plainly states' 1 that it came from Stockton, California. As only'oue species of this genus is 
found in San Joaquin River, C. labiatus becomes a synonym of C. occidentalis, and the Klamath Lake 
species is left without a name, a fact first pointed out by Mr. J. O. Snyder, for whom the fish has been 
recently named by Dr. Gilbert. t 
The type specimen upon which Dr. Gilbert based his description is less than 8 inches long. As the 
one which we have from the mouth of Williamson River is much larger (length, 144- inches) and shows 
some slight differences, we describe.it fully as follows: Head 4f; depth 4; eye 6f in head; snout 2f; 
maxillary 3f ; mandible 2'-- ; interorbital 2| ; width of mouth 34 in head, more than half length of snout ; 
greatest width of lower lip f diameter of eye; D. ii, 11; A. 7; scales 13-70-11. Body rather slender ; head 
long, mouth moderate, horizontal; lips thick papillose, the upper with about 4 or 5 rows of papill®, 
lower with about 7; lower lip divided nearly to base, leaving only one row of papilhe crossing the 
symphysis; premaxillary not much projecting and not forming a prominent hump ; maxillary rather 
short, not reaching vertical at front of anterior nostril; eye equally distant between snout and poste- 
rior edge of opercle; mucous canals on head forming raised ridges, the pores conspicuous. Fins mod- 
erate; origin of dorsal a little nearer snout than base of caudal, sixth spine over insertion of ventrals; 
pectoral If in head, reaching slightly more than two-thirds distance to ventrals ; ventrals not quite 
reaching vent, the seventh ray longest, If in head; anal long, pointed, reaching to base of caudal, 1£ 
in head. Scales crowded anteriorly, about 32 transverse rows in front of dorsal, strongly ridged, the 
margins crenate. 
7. Chasmistes stomias Gilbert. 
One specimen, 15 inches long, obtained from an Indian at Klamath Falls, November 11. Head 44; 
depth 4f ; eye 7 ; snout 2f ; maxillary (measured from free end to tip of snout) 34; mandible 24; D. ii, 
11; A. i, 7; scales 13-85-10; interorbital width 2f ; vertical depth of head at mandibular articulation 
2).. Head small, body heavy forward, the back strongly and regularly arched from snout to origin of 
dorsal fin, thence declined in a nearly straight line to base of caudal; ventral surface nearly straight. 
Premaxillary spines strongly protruding, forming a prominently projecting snout ; mouth rather small, 
inclined upward at an angle of about 40°, maxillary scarcely reaching vertical from front of anterior 
nostril ; width of mouth If in snout or 4f in head ; upper lip thin, without papillae ; lower lip thin, 
interrupted at the symphysis, forming narrow lateral lobes the width of which is about 2f times in 
their length ; faint indications of a few papillae ; mucous canals forming ridges, the pores conspicuous; 
gill-rakers long, narrowly triangular at the tip when viewed from behind, densely tufted on the 
anterior edge; fontanelle narrow, its length 2f in the snout, its width about y its length. Fins all 
large ; the origin of the dorsal a little nearer tip of snout than base of caudal, the sixth ray over base 
of ventral, its base If in head, the free edge nearly straight, the last ray If in the first, which is If in 
head; pectorals scarcely falcate, reaching a little more than two-thirds distance to base of ventrals, 
their length If in head; ventrals long, reaching vent, the rays gradually increasing in length from the 
outer to the seventh and eighth, which are longest, the ninth and tenth being but slightly shorter, 
the length of the longest ray If in head or about f longer than the first; anal long and pointed, the 
fourth ray longest, reaching base of caudal, If in head; each ray of anal fin with 8 to 12 strong 
tubercles; caudal lobes about equal, their length 1| times the middle ray. 
This specimen agrees with Dr. Gilbert’s type,} with which we have compared it. In the type the 
mouth is rather more oblique, the maxillary is slightly longer, and the anal fin is longer. 
8. Chasmistes copei, new species. Klamath Indian name “ Tsivam.” 
Type No. 48224, U. S. N. M. (collectors’ No. 871), a specimen 16 inches long. Type locality: 
Northwest part of Pelican Bay, Upper Klamath Lake, Oregon ; collected (in gill net) November 6, 1896, 
by Messrs. S. E. Meek and A. B. Alexander. 
Head 3f; depth 4; eye 6f; snout 24 ; maxillary (measured from free end to tip of snout) 3; 
mandible 2f ; D. ii, 10; A. i, 7; scales 13-80-12; interorbital width 2f ; vertical depth of head at man- 
dibular articulation 2f. Head large, cheek very deep, the depth equal to distance from tip of snout 
to nostril ; body stout, back scarcely elevated, caudal peduncle rather short and stout ; ventral surface 
somewhat convex. Premaxillary spines less protruding than in C. stomias, not forming a prominent 
*Proc. Cal. Ac. Nat. Sci., i, 1855, 33. 
tBull. U. S. F. C. 1897, 3. 
t Described in Bull. U. S. F. C. 1897, 5, with figure. 
