FISHES OF THE KLAMATH BASIN. 
3 
3. Catostomus rimiculus Gilbert & Snyder, new species. 
? Catostomus tahoensis Cope, Proc. Ac. Nat. Sci. Phila. 1883, 152 ; Warner Lake. 
This species belongs to the C. catostomus type, with very small scales, and is most nearly related 
to C. tahoensis. From the latter it differs in the smaller eye, less deeply cleft lower lip, blunter labial 
tubercles, larger scales, and the much smaller fontanelle, which is reduced in adults to a very narrow 
linear slit, or more commonly entirely obsolete. 
Type No. 5654, Leland Stanford Junior University collection. Type locality. Trinity River, Hoopa 
Valley, Humboldt County, California. Collector, Capt. W. E. Dougherty. Additional specimens 
were collected in Scott River (Klamath Basin), Siskiyou County, California, by R. C. McGregor. 
Head 4£ in body ; depth 5 ; depth of caudal peduncle 2f in head ; eye 74 ; dorsal rays 11 ; anal 
rays 7; scales in lateral line 91; above lateral line 18; from lateral line to insertion of ventral 13; 
before dorsal 42. Dorsal 11. Anal 7. Pectorals 17. 
Head as deep as wide. Both lips full, the lobe of lower lip broadly rounded behind, the cleft not 
nearly reaching base of lip; the portion between mandible and apex of cleft with four series of 
tubercles; tubercles coarse and blunt, becoming reduced in size toward margins of lips, but less so 
than in related species; upper lip with five rows of tubercles. Eyes very small, the front of the eye 
nearly midway of head. Interorbital space convex, 2f in head. 
Scales comparatively smooth, gradually growing smaller posteriorly. 
Dorsal fin inserted midway between end of snout and base of caudal; first ray preceded by two 
short, simple ones; last ray divided to base; length of base of fin equal to the height, which is 
contained times in the body. Height of anal twice the length of the base; contained 5 times in 
body; length of pectorals 4|- in body; ventrals 64 in body; caudal 4J. 
Color above dusky, the central parts of scales lighter; under parts white; dorsal and caudal 
fins dusky, others white. 
The total length of the type is 266 millimeters. 
In the following table the scales above the lateral line were counted from the lateral line upward 
and forward to a point half way between the dorsal fin and occiput ; below the lateral line, downward 
and backward to insertion of ventral. 
4. Catostomus snyderi, new species. 
Catostomus labiatus Girard, Proc. Ac. Nat. Sci. Phila. 1856,175; and of all recent authors. Not 
Catostomus labiatus Ayres, Proc. Calif. Ac. Nat. Sci. 1855, 32, from Stockton, California, and 
synonymous with C. occidentalis Ayres. 
Type, No. 48222, U. S. N. M. Type locality, Upper Klamath Lake, Oregon. Collectors : Gilbert, 
Cramer, and Otaki. 
Closely related to C. occidentalis and C. macrocheilus, differing from both species in the shorter 
head, smaller mouth and lips, deeper caudal peduncle, somewhat smaller scales, and in the shorter 
dorsal fin, which is more anteriorly inserted. 
Head 4J- in length; snout 2-,% in head, equaling interorbital width; eye 5|; D. 11; A. 7; scales 
69 to 77 ; above the lateral line, 13 or 14 ; below the lateral line, 10 or 11. Mouth very small, the width 
between angles but half length of snout in our largest specimen; greatest width of lobe of lower lip 
two-thirds diameter of eye; lower lip deeply incised, with one or two papill® between symphysis and 
base of cleft ; upper lip narrow, with five or six papillae in a cross series, the uppermost becoming very 
small; basal portion of the lower lip with coarse tubercles, those toward posterior margin becoming 
very fine and arranged in evident series separated by grooves. Mucous canals on head forming 
conspicuous raised ridges with prominent pores, the system much more conspicuously developed than 
in any related species. Origin of dorsal fin constantly nearer snout than base of caudal; the dorsal 
fin short, its base not exceeding the height of the longest ray, usually less. In our specimens the 
