194 College of Forestry 
Of adults there is no data upon which to express an 
opinion. One stomach contained crawfish, fish, and mollusk 
material and it is probable that the food is similar to that 
deseribed by Forbes for Illinois. Fish for stomach exam- 
inations should be freshly caught. Those caught in fyke nets, 
eill nets, or trammel nets are usually unsatisfactory because 
digestion has usually progressed so far as to render the 
material unrecognizable. If taken with such nets they should 
be examined frequently. The average of mollusean food for 
all localities here considered is about 8 per cent. 
Percina caprodes zebra (Agassiz). Manitou Darter; Log 
Perch. 
Forbes (1880, a, p. 28, 27) records the food of the Log 
Perch of Illinois as follows (11 specimens examined ) : 
Molluscat. “Aineyluseripwlanis: aps sce = oo) eee ea eee 1 per cent. 
Insecta. Chironomus and other fly larve........ 43 
Elemipbernae (iG O7t@)) me « opierse eke cite ae 5 
ING UGOPUETal wtp Ween pyar set. cot hich tka ae 17 
—— 65) percent. 
Crustacea. Amphipoda (Allorchesters) ........... 3 
Cladocera (Daphnia, ete.) 3.22.5 > 26-4. 24 
Ostracoda Cuprigid@) ene ae coe 1 
Copepoda (Gy clops)ian scene teenie 5 
——=— so speracent. 
Plants. ANS Bb BE Bee ehh Mia Sco So hige Sees Pan stens cA eee 1 per cent. 
Six individuals, caught in Lower South Bay, October 12, 
1914 (with seine in shallow water near pier) were exam- 
ined and the stomach contents noted. The contents averaged 
as follows: 
Molluscan; eBlanonbis, Aunmicola, = 72. <2). puree eee 1.00 per cent. 
Insecta. Chironomid larve and Odonata nymphs... 6.00 per cent. 
Crustacea. Amphipoda, Copepoda, Cladocera......... 36.40 per cent. 
Decapoda. Gar mea hie cee wes ockie bps < eke. 30.00 per cent. 
Plants. Filamentous aloe. (ebCie eee ses asin ceil & 18.00 per cent. 
NECN HCl SONS did Gon Sinibrdee ne Sb emis BHD bom ob Coc 8.60 per cent. 
DATA FOR FOCD IABITS OF MANITOU DARTER. 
No. 1 (309). 48 mill. long. 
Insecta. l Ephemera nymph ....... 
1 Bnallagma nymph ...... + 5 per cent. 
PRON HU) Ta aiN Oy So 5 chs Ades 
