A LIST OF ENTOMOSTRACA FROM THE 
OKOBOJI REGION. 
FRANK A. STROMSTEN. 
The following is a list of Entomostraca collected by the writer 
at the Macbride Lakeside Laboratory during the August ses- 
sion, 1916. The starred forms have been previously reported 
from this region by Prof. L. S. Ross in volumes III and IY of 
the Proceedings of the Academy. 
CLADOCERA. 
SIDIDAE. 
*Sida crystallina (0. F. Mueller), West Okoboji. Abundant. 
DAPHNIDAE. 
*Daphnia hyalina Leydig. West Qkoboji Lake. 
v Daphnia kahWergensis. East and West Okoboji and Gar Lakes. 
Scapholeibris mucurata (0. F. Mueller). West Okoboji Lake. 
Abundant. 
Simocephalus vetulus (0. F. Mueller). West Okoboji and Drain- 
age Canal. Abundant. 
*Simocephalus serrulatus (Kocli). West Okoboji Lake. Abundant. 
Simocephahis americanus Birge. Drainage Canal. 
BOSMINIDAE. 
*Bosmina longirostris O. F. Mueller. Very abundant in this 
region. 
LYCEIDAE. 
Gamptocercus macrurus 0. F. Mueller. West Okoboji Lake. 
Alonella excisa Fischer. Kettlehole near West Okoboji Lake. 
Pleuroxus stramineus Birge. Spirit Lake and West Okoboji Lake. 
*Pleuroxus clenticulatus Birge. Kettleholes and West Okoboji Lake. 
* Pleuroxus procurvus Birge. Kettleholes and West Okoboji Lake. 
( Pleuroxus hcnnatus Birge. Iowa City). 
COPEPODA. 
CENTROPAGIDAE. 
Diaptomus siciiis Forbes. West Okoboji and Gar Lakes. 
Diaptomus signicauda Lilljeborg. West Okoboji Lake. 
Diciptovius oregonensis Lilljeborg. Kettleholes, Okoboji and Gar 
Lakes. Abundant and some specimens highly colored. 
Diaptomus clavipes Schacht. East Okoboji Lake. 
Diaptomus pallidus Herrick. Middle Gar Lake. 
