68 
BULLETIN OF THE UNITED STATES FISH COMMISSION. 
very limited vegetation supported by tbe lake reduce the food supply almost wholly to 
small free-swimming crustaceans and insect larva}. Both are present in considerable 
abundance, but probably not in sufficient quantities to support a large number of fishes. 
On the other hand, fishes planted in this lake will have no rapacious fishes with which 
to contend; the struggle will, therefore, be wholly with the physical environment and 
the food supply. It has, therefore, been recommended that a plant of trout be made in 
Crater Lake, and it is hoped that the Mazamas who visit the lake hereafter may make 
observations to determine the result of the experiment. The best species to plant is 
the black-speckled trout of Lake Tahoe, Salmo mylciss henshawi. 
LIST OF FISHES. 
In the following list of fishes we give only those species of which specimens were 
obtained by us during the investigations of 1896. In the nomenclature and sequence 
of species we follow Jordan & Evermann’s Check-List,* recently published: 
1. Entosphenus tridentatus (Gairdner). Three-toothed Lamprey. 
A specimen, 18 inches long, was obtained July 23 in Alturas Inlet, 1 mile above the lake, and 
several larvae were dug out of the sand at the head of the lake July 25. Comparing the large specimen 
with one 24 inches long, obtained by Mr. Williams at Big Payette Lake, some important differences 
are noted. In the Payette example the dorsal fins are separated by a space equal to one-third the 
length of the base of the anterior fin, while the Alturas example has the dorsals scarcely separated. 
The fins are also much higher in this specimen, the height of the anterior dorsal being contained 
3f times in head, measured to first gill-opening, or If times in the height of the second. The infraoral 
lamina has 5 cusps; the supraoral has 3, the middle one being much smaller than the other two; the 
buccal teeth before the mouth are unicuspid ; on each side of the oral opening are 4 teeth, the anterior 
and posterior ones of which are bicuspid, while the other two are tricuspid. The arrangement of the 
teeth does not differ materially from that in the Payette specimen. The larvae range from If to 3f 
inches in total length. In all of these the dorsal fin is continuous, though deeply incised. 
An example lOf inches long was found attached to a chub in Upper Klamath Lake, November 10. 
2. Acipenser medirostrin Ayres. Green Sturgeon. 
Common near the mouth of Siuslaw River ; several taken in a seine near Acme in September, 
measuring about 18 inches each in total length. At Gardiner, near the mouth of the Umpqua, a good 
many large sturgeon, probably A. transmontanus, were taken in November and December. 
3. Pantosteus jordani Evermann. Western Blach Sucker. 
During the season’s work this sucker was found only in Wallowa Lake, Oregon. Two small 
specimens were obtained in the upper end of the lake August 24. 
4. Catostomus tsiltcoosensis, new species. 
Type No. 48479, U. S. Nat. Mus. ; cotypes No. 38, U. S. F. C., and No. 5703, L. S. Jr. Univ. Mus. 
Type locality: Tsiltcoos Lake, Lane County, Oregon, where numerous specimens were obtained 
December 2, 1896, by Dr. Meek. 
Apparently most closely related to C. occidental is Ayres. 
Head 4f; depth 5; eye 6f in head; snout 2; D. 13; A. 7; scales 13-65-8, 34 before the dorsal. 
Pectoral If in head; longest dorsal ray If; base of dorsal If; longest anal ray If; ventral If. Body 
rather slender, subterete; head small, snout long and pointed; mouth inferior, overhung by the pro- 
jecting snout; lips rather thin, one row of large papillae on upper lip, and about 2 irregular rows of 
smaller ones behind or inside of it; lower lip incised nearly to base, 1 or 2 rows of small papillae 
across the isthmus ^ lobes of lower lip moderately long and thin, the bases with papillae merging 
into plications toward the tips. Eye quite small, the anterior edge of orbit at middle of head. Top 
of head flat or very slightly convex between the eyes. Fins small; pectorals short and rounded; 
*A Check-List of the Fishes and Fish-like Vertebrates of North and Middle America, in Report 
U. S. F. C. for 1895 (December 28, 1896), 207-590. 
