Juday—Lakes in Central America. 241 
greatly exceeded the total copepod population of either of the 
two temperate lakes. 
Here, as in the other tropical lakes, the rotifer population was 
limited to very few forms, but two in this instance. Protozoa 
were nearly as numerous as in Cayuga lake and greatly exceeded 
the number in Seneca. 
Excluding the diatoms, the number of algae was not very dif¬ 
ferent in the three lakes. The diatoms were more abundant in 
Coatepeque than in Seneca lake, but the number in the former 
was much smaller than in Cayuga lake. 
List of Plankton Crustacea. 
In addition to the collections made at the four lakes which 
were visited, material was also obtained at the following places: 
Puerto Barrios, Los Amates, and from the mangrove swamp at 
San Jose, Guatemala; from the Sunken Gardens and Lakeside 
Tivoli at Mexico City, and in the vicinity of San Cristobal near 
Mexico City. In the following list the various forms which were 
found in the material are indicated, together with the localities 
in which they were obtained. 
CALANIDAE. 
Osphranticum labronectum Forbes. Puerto Barrios, Los 
Amates. 
Diaptomus siciloides Lilljeborg. Lake Ilopango. 
Diaptomus albuquerquensis Herrick. Lake Amatitlan, Mex¬ 
ico City. 
Diaptomus marshi Juday. Puerto Barrios, Los Amates. 
Diaptomus sicilis Forbes. Lake Coatepeque. 
CYCLOPIDAE. 
Cyclops ater Herrick. Mexico City. 
Cyclops viridis Jurine. Mexico City, San Cristobal. 
Cyclops albidus Jurine. Puerto Barrios, Los Amates, Mexico 
City. 
Cyclops fuscus Jurine. Lake Atitlan, Mexico City. 
Cyclops serrulatus Fischer. Lakes Amatitlan and Atitlan, 
Los Amates, Mexico City, San Cristobal. 
\ 
16—S. A. 
