FISHES OF THE KLAMATH BASIN. 
5 
backward to lateral line from in front of dorsal; 11 in a series upward and forward from base of 
ventrals to lateral line; 32 or 33 oblique series crossing back in front of dorsal flu. 
Color dark on upper portions of bead and body, silvery on belly and lower part of sides. Fins all 
dusky. 
The Indians to whom this fish was shown failed to distinguish it from Catostomus snyderi, applying 
to both of them the name Yen. 
Below is a table of proportionate measurements of three specimens, the unit being hundredths of 
the standard length. 
Measurements. 
No. 1. 
No. 2. 
No. 3. 
Total length in mm 
370 
250 
195 
i Length of head 
22 
234 
11\ 
Length of mandible 
7 
8" 
74 
Length of maxillary 
5 
6 
54 
Depth of bead at mandibular joint 
94 
104 
104 
Iuterorbital width 
10 
104 
10 
1 Depth of caudal peduncle 
8i 
94 
84 
Length of caudal peduncle , 
16 
16J 
17 
Snout to insertion of dorsal 
48 
50 
48 
Snout to insertion of ventrals 
52 
57 
55 
Ohasmistes stomias Gilbert, new species. Drawn by A. H. Baldwin from tbe type (No. 48223, U. S. N. M. ) 
from Upper Klamath Lake. 
6. Chasmistes stomias, new species. Klamath name, K-alip-tu. 
Type, No. 48223, U. S. N. M. Type locality, Upper Klamath Lake, Oregon. Collectors: Gilbert, 
Cramer, and Otaki. 
Distinguished from all species of the genus except C. brevirostris by the small scales. From the 
latter, as already indicated, it differs in the deeper head, larger mandibles, more steeply inclined 
mouth, and by the presence of strongly marked protuberances on the upper side of the snout, caused 
by the protruding spines of the premaxillary processes. 
Month inclined at an angle of over 45°. Maxillary' longer than in C. breviroslris, but scarcely 
reaching vertical from front of nostril, its length contained 1£ times in snout. Length of mandible 
exceeding that of snout in adults, in one specimen equaling distance from tip of snout to middle of 
eye. Lips thin, the lower interrupted at symphysis, forming narrow lateral lobes. In none of our 
specimens can we detect papillae on either lip. The lower lip is ridged and slightly fringed on its 
lower edge. Snout 2£ to 2* in head. Interorbital width 2£ to 2£. Vertical depth of head at 
mandibular articulation 2-J- in length of head. Mucous canals raised to form narrow ridges, the pores 
conspicuous. Gillrakers long, narrowly triangular, the free margins densely tufted. Fontanelle 
very narrow, often shortened by a coalescence of posterior halves of parietals. In adults a median 
frontal crest often developed. 
Ventrals inserted under middle of dorsal. Front of dorsal usually nearer tip of snout than base 
of caudal. Anal long, the rays extending beyond base of caudal in adult males. Pectorals nearly’ 
