JUN 2 0 1914 
t 
The Ohio T\£aturalist, 
PUBLISHED BY 
The Biological Club of the Ohio State University. 
Volume XIV. MAY, 1914. No. 7. 
TABLE OF CONTENTS 
Mote —The Cheese Skipper. .. . 309 
Brown -Starch Reserve in Relation to the Production of Sugar, Flowers, Leaves, and 
Seed in Birch and Maple. . 317 
Lathrop —Egg-laying of the Rice Weevil, Calandra oryzae Linn. 321 
Durrei.i — The Iridales of Ohio. 327 
McAvoy— Meetings of the Biological Club. 331 
THE CHEESE SKIPPER. (Piophila casei Linne.)* 1. 
An Account of the Bionomics and the Structure of Dip¬ 
terous Larvae Occuring in Human Foods with Particu¬ 
lar Reference to those which have been Recorded 
as Accidental Parasites of Man. 
Don C. Mote. 
The cheese skipper, Piophila casei Linne, is, because of its 
habits, of considerable economic importance to man. Manufac¬ 
turers of cheeses and smoked meats have sustained large losses 
from the ravages of the larva of this fly. Cases are on record 
where from $1500 to $2000 have been lost in one season. The 
possible relation of this fly to myiasis increases its importance. 
The Bureau of Entomology, U. S. Department of Agriculture, has 
one record of its occurence in man. Alessandrini reports, as a 
result of experiments with this species on dogs, that it passes 
through the digestive tract uninjured and that it may cause in¬ 
testinal lesions in the dog. It is therefore desirable that medi¬ 
cal men, public health officers, meat inspectors, and parasitolo¬ 
gists have a knowledge of the anatomy and breeding habits of 
this fly. The investigations upon which this account are based 
were begun at the Ohio Experiment Station in September 1912, 
when the larval stage of the cheese skipper was brought to the 
laboratory in some bacon that had been purchased of a local 
meat dealer. The bacon was placed in a jar and has with an ad¬ 
ditional quota of bacon, nourished many broods of larvae. 
* Determined by Professor J. S. Hine. 
309 
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