4 
BULLETIN OF THE UNITED STATES FISH COMMISSION. 
pectorals reach scarcely two-thirds distance to ventrals and the ventrals scarcely two-thirds distance 
to vent. The anal may extend beyond base of rudimentary caudal rays. 
Scales strongly ridged, their margins crenate; the anterior scales are smaller, but do not appear 
greatly crowded; the average number of tubes in the lateral line is about 73, the number varying 
from 69 to 77. There are 13 or 14 in an oblique series from middle of back downward and backward 
to lateral line, and 10 or 11 between lateral line and base of ventrals. 
Dusky, the lower part of sides with coarse black specks, the under parts white. Fins all dusky. 
In the following table of measurements the unit is one hundredth of the length from tip of snout 
to base of median caudal rays. The length of caudal peduncle is taken from base of last anal ray to 
the vertical from base of median caudal rays : 
Measurements. 
No. 1. 
No. 2. 
No. 3. 
No. 4. 
Total length in millimeters 
238 
205 
153 
139 
Length ot' head 
23 
23 
23 
23 
Length of snout 
11 
10 
10 
10 
Diameter of eye 
4 
4 
4 
5 
Length of mandible 
61 
7 
u 
7 
Interorbital width 
10' 
94 
91 
10 
Depth at occiput. • 
18 
17 
171 
18 
Depth of caudal peduncle 
94 
9 
94 
91 
Length of caudal peduncle 
161 
i 16J 
16 
18' 
Distance from snout to origin of dorsal 
49' 
! 49 
484 
49 
Distance from snout to insertion of ventrals 
55 
55 
544 
54 
Heiaht of dorsal 
164 
164 
17 
! 18 
Base of dorsal 
164 
14 
17 
154 
In 13 specimens the fully developed dorsal rays are 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 12, 12, 12. All 
have 7 anal rays. In 11 specimens the oblique rows of scales above lateral lino are 70, 71, 73, 73, 73, 75, 
75, 75, 76, 77, 77. 
A few specimens, none of them adult, were taken in Upper Klamath Lake and in Lost River. The 
species is named for my assistant and coworker, Mr. John O. Snyder, who first noticed that Catostomus 
labiatus was a synonym of C. occidental is, and that the present species was uunamed. 
5. Chasmistes brevirostris Cope. 
Two species of typical Chasmistes inhabit Upper Klamath Lake, so similar in all their characters 
that it is difficult to decide to which one the name brevirostris properly belongs. The scale and fin 
formulae are the same, and the general proportions scarcely differ. One of them has a larger, deeper 
head, with larger, more obliquely placed mouth, and conspicuously protruding premaxillary spines. 
To the other, with smooth upper profile of snout and smaller, more nearly horizontal mouth, I here 
apply the name brevirostris, following Cope’s assertion that the snout “is without the hump produced 
by the protuberant premaxillary spines.” In all other respects Cope’s brief description applies 
equally well to both species; but the one described below as new, under the name C. stomias, is 
apparently the most abundant in the lake, and is known to the Indians by the name attributed by 
Cope to C. brevirostris. 
One adult and several young specimens of C. brevirostris were preserved ; others were seen, but 
were so mutilated as to be unfit for preservation. From this adult, a female 37 cm. long, the following 
notes are taken : 
Mouth inclined at an angle of about 15°. Maxillary reaching a vertical from slightly behind 
front of nostrils, its length contained If times in snout. Mandible 1J in snout. Lips thin, the lower 
interrupted at symphysis, forming moderate lobes laterally. Both lips with small, inconspicuous, 
sparse tubercles, those on upper lip in three or four series. In other specimens these can not be 
detected, owing, perhaps, to poor state of preservation. Snout 2-J or 2§- in head. Interorbital width 
(2-J- in young). Vertical depth of head at mandibular articulation 2 ^ in length of head. Mucous 
canals large, with very prominent series of pores on head, as apparently in all the fishes of Klamath 
Lake. Gillrakers slender, triangular, their free edges densely tufted. Fontanelle narrow. 
Ventrals inserted under the middle of the dorsal. Front of dorsal slightly nearer tip of snout than 
base of caudal. Anal elongate, in the adult female reaching to opposite base of median caudal rays, 
doubtless extending farther in adult males. Pectorals not reaching two-thirds distance to ventrals, 
1J in head. Ventrals extending two-thirds distance to vent. 
Scales with strong concentric striae, the radiating ridges produced into narrow projecting lobes at 
margin. Seventy-three scales in the course of the lateral line; 13 in an oblique series downward and 
