FISHES FROM NORTHEASTERN CALIFORNIA. 
147 
Catostomus tahoensis Gill & Jordan. 
Head 4.4 in length, 5 to tip of middle caudal rays; depth 4.8 in length; width of head through 
opercles equal to its depth; eye 5.5 in head, 2.5 in snout, 2.7 in interorbital space, 1.7 in distance from 
eye to upper end of gill-opening (by eye is meant the orbital opening, not the eye-ball nor socket) ; 
interorbital (bone) 2.3 in top of head; width of isthmus 3.8 in head, a little less than distance 
between eye and gill-opening, equal to width of opercle, and also equal to distance between 
corners of mouth. (Measurements made on a 7.3 inch specimen.) D. 11; A. 7; scales 17-89 to 
105-16. Body rather slender, profile steep; snout blunt; mouth large, with full lips, covered 
with rather coarse papillae which do not become much smaller toward margin of lips; upper lip 
with about six rows of much-crowded papillae: lower lip with two rows across symphysis, and 
about 8 papillae in a longitudinal row through lobes; posterior margin of lower lip reaching ver- 
tical through posterior nostril. Orbital rim but little developed, middle ridge of skull broad, the 
interorbital space rather high and rounded. Insertion of dorsal in middle of body, its length 1.4 
in its height. Insertion of ventrals under fifth ray of dorsal. Length of caudal 1 to 1.1 in head, 
rather deeply forked, middle ray 1.6 in longest. Anal reaching past base of caudal, its height 
equaling length of caudal; length of ventrals equals height of dorsal; pectoral a little shorter than 
caudal. Least depth of caudal peduncle 2.6 in head. Lateral line complete, straight. Peritoneum 
black. Color nearly black above, slightly mottled with pale yellowish below. 
Taken in Willow Creek, Susan River, Little Truckee River, and Prosser Creek. Description 
based on specimens from Susan River. 
Chasmistes chamberlaini Rutter, new species. 
One young example, 1.7 inches long, and a dried head 3.3 inches long, which can not be referred 
to any hitherto described species, were obtained at Eagle Lake. Eye 7 in head, 3 in snout, 2.8 in 
interorbital bone, 2 in distance from eye to upper end of gill-opening. Premaxillary spines form- 
ing a prominent hump, maxillary inclined about 40°,. falling far short of anterior nostril, its length 
from free end to tip of snout just equal to snout in front of nostril, 3.2 in head; lower jaw 3.5 in 
head. Interorbital (bone) 2 in head, considerably arched transversely; a low, sharp longitudinal 
ridge along middle suture, showing even in the young example. Nasal spines very prominent; 
fontanelle closed, covered by a thin bone. Mucus canals prominent, but probably intensified in 
dried specimen. Lips thin, two rows of papillae on upper; lower incised to base, lobes small, with 
scattered papillae (The above data from the dried head.) 
Cross series of scales 93; D. 10; A. 7. Origin of dorsal in middle of body, ventrals inserted 
under sixth or seventh ray of dorsal. Pectoral broad, reaching two-thirds distance to ventrals. 
Ventrals scarcely reaching vent, the outer two rays longest. Anal low, when depressed reaching 
halfway to caudal. Caudal peduncle long and slender. 
Has smaller scales than any other species of the genus. The dorsal and anal are the same as 
in C. copei, but it differs from that species in the broad interorbital and the papillose lips, in addi- 
tion to the small scales. The sharp ridge on interorbital also seems to be a distinctive character. 
Named for Mr. F. M. Chamberlain, of the U. S. Fish Commission steamer Albatross. 
Type (No. 50588 U. S. Nat. Mus.). Collected in Eagle Lake by Rutter and Chamberlain. 
Leuciscus egregius (Girard). 
The specimens here noted are not quite so deep as specimens from Winnemucca, Nev., but 
otherwise can not be distinguished. They have two red stripes along side, with a darker stripe 
between. Lower part of cheek yellowish, with some yellow along edge of belly. Scales in lateral 
line 55 to 63. D, 8 or 9; A. 8 or 9. Common in Willow Creek and Susan River. 
Rutilus olivaeeus (Cope). Eagle Lake White-fish. — 5' '• ^ i 
This species was met with in Eagle Lake and Willow Creek, where it attains a length of 8 inches. 
Plead 3.3 to 3.7 in body; depth 3.7 to 4.5; eye 4.4 to 5 in head; insertion of dorsal 0.53 to 0.57 of 
body from snout. Scales 15-58 to 64-8; D. 8; (A. 8;. teeth 5-4 or 5-5. Body elongate, little com- 
pressed, little elevated, regularly curved from occiput to dorsal, highest over tip of pectoral. Head 
long; mouth oblique; jaws even, the lower forming a distinct though very obtuse angle with lower 
profile. Premaxillary on level with, lower half of pupil. Top of head slightly concave. Lateral 
line but little decurved. Tip of depressed dorsal over front of anal. Caudal peduncle long, but 
little tapering, its length from anal equal to head behind front of eye, its thickness over end of anal 
equal to snout. This species differs from Rutilus bicolor in the finer scales and in having the same 
number. of rays in the anal that it has in the dorsal, R. bicolor having one fewer in the anal. 
