792 Wisconsin Academy of Sciences, Arts, and Letters. 
Alona afjinis Ley dig. 
Chydorus sphaericus 0. F. M. 
Epischura and Diaptomus showed a diurnal movement of 
one and a half meters, Daphnia hyalina at least twelve meters^ 
and D. pulex fifteen meters. 
THE TROUT. 
The Tahoe trout (Salmo henshawi) was the one most gener¬ 
ally caught by the fishermen. The second in point of numbers 
obtained was the silver trout (Salmo tahoCnsis). The former 
was caught chiefly in the western and southern portions of the 
lake, while the latter was found chiefly in the northeastern por¬ 
tion. The stomachs of a do<zen Tahoe trout were obtained for a 
study of their contents, but only three of them contained food 
material of any consequence. The other nine contained only in¬ 
sect fragments that were too small to be identified. Each of 
two stomachs, from trout that were 40 centimeters long, con¬ 
tained from 50 to 75 Daphnias and fragments of Chironomid 
pupae and adult Chironomus. The third stomach, from a male 
38 centimeters long, contained over 1,700 Daphnias , about 
two-thirds of which were Daphnia pulex and the remainder 
D. hyalina. Four Tahoe trout were obtained from some small 
lakes lying south of Lake Tahoe. One of these specimens was 
25 centimeters long, and the other three about 18 centimeters 
each. The stomach of the largest one contained the elytra of 
two beetles and fragments of 25 or 30 ants. One of the other 
three contained 32 damsel-fly nymphs; another 6 damsel-fly 
nymphs, 4 water tigers (larval Dytiscidae), and many Chir¬ 
onomid larvae; the third contained 4 water tigers and many 
Chironomid larvae. No specimens of the silver trout were ob¬ 
tained for a study of their food. 
HOCKETT HAKES. 
These small lakes are situated in the southern part of the 
High Sierras, in the valley of the South fork of the Kaweah 
river. Some plankton material was obtained from two of 
these lakelets on July 16, 1904. The following Crustacea were 
found in this material: 
