302 College of Forestry 
and boulders.. The crawfishes are described and figured by 
Ortmann (1905, 1906), Faxon (1885, 1898), and Pearse 
(1910). 
ORDER ARTHROSTRACA, 
SUBORDER AMPHIPODA. 
The amphipods were determined by Miss Ada L. Weckel. 
Famiry GAMMARIDA, 
Gammarus fasciatus Say. 
Stations XXXIX and XL. From stomachs of Manitou 
Darter and Tessellated Darter. 
Hyalella knickerbockert (Bate). 
Stations X, XVI. From stomachs of Golden Shiner, 
Common Bullhead, Rock Bass, Pumpkinseed, Yellow Perch, 
Manitou Darter and Tessellated Darter. An account of the 
freshwater amphipods will be found in Weckel’s paper 
C1907). 
SUBORDER ISOPODA. 
Famity AsELLIDA. 
Asellus aquaticus (Linn). 
From stomach of Tessellated Darter. Fragments of an 
Asellus were observed in the Pumpkinseed. This Asellus 
is large and agrees with the description and figures of 
aquaticus (Richardson, 1905, p. 480). 
Crass Hexapopa (Insects). 
ORDER EPHEMERIDA (May-flies). 
The EHphemerida, Odonata and Plectoptera were deter- 
mined by Dr. J. G. Needham. 
Famity EPHEMERID®. 
Hexagema bilineata Say. 
The nymphs of this May-fly were observed in the stomachs 
-f the Common Red-horse and Yellow Bullhead. <A good 
