SCIENTIFIC SURVEY OF TURNER'S LAKE 17 
Polyphemus pediculus (Linné). Common in northern United 
States in lakes and pools. 
Epischura lacustris Forbes. Central and eastern United States in 
lakes and ponds. 
Diaptomus minutus Lilljeborg. Northern United States and north 
to Greenland and Iceland. 
Cyclops viridis var. americanus Marsh. ‘This is a widely dis- 
tributed species in pools and lakes. 
The species found at the surface were taken again at a depth of 15 
feet with the addition of: 
Eurycercus lamellatus (O. F. Muller). 
This is the only species of the genus found in America and is 
common in permanent pools and lakes. The figure is enlarged about 
25 diameters and shows a mature female with eggs in the brood 
chamber on the back. 
At a depth of thirty feet were all species found at the surface with 
the exception of Polyphemus pediculus (Linné). 
It is perhaps worthy of remark that none of the larger crustaceans 
were collected in Turner’s Lake, although careful search was made 
in all situations. This is the more remarkable because of the great 
abundance of the smaller forms. 
INSECTA 
(Identified by D. B. Youne, Assistant N. Y. State Entomologist, Professor 
P. W. CLaassen and Dr. W. T. M. Forres of Cornell University) 
Ephemeridae 
The May-flies. | 
No adult May-flies were taken, but a few nymphs belonging to the 
genus R/ithrogena were found under stones near shore. 
Odonata 
The Dragon-flies 
Dragon flies were not uncommon about the lake, particularly the 
small Sympetrum vicinum Hagen. On Sept. 16th a pair of Aeschna 
constricta Say was taken and a few days later a pair of Somatoch- 
lora tenebrosa Say. ‘These are all common and widely distributed 
species. 
Hemiptera 
The Bugs 
Arctocorixa calva (Say). 
Metrobates hesperius Uhl. 
