The Ohio JJ^aturalist, 
and Journal of Science 
PUBLISHED BY 
The Biological Club of the Ohio State University. 
LWKAUr 
NKVV \ OKS 
hotanicah 
*A KUEN. 
Volume XV. JUNE, 1915 . No. 8. 
TABLE OF CONTENTS 
Jaiiues —The Fish-feeding Coleoptera of Cedar Point. 525 
Osborn and Drake —Records of Guatemalan Hemiptera-Heteroptera with Description 
of New Species. 529 
Brown —Variation in the Size of Ray Pits of Conifers. 542 
Melchers— Root-knot or Eelworm Attacks, New Hosts.551 
Drake— Meetings of the Biological Club . .. . 556 
THE FISH-FEEDING COLEOPTERA OF CEDAR POINT. 
H. E. Jaques. 
The writer made numerous observations of the fish feeding 
Coleoptera of Cedar Point during a period of eight weeks in the 
summer of 1912. In the following summer the work was taken 
up in a more systematic way and efforts made to secure data as 
to the number of species feeding on fish, their life histories, food 
habits, and other items of interest. 
A recital of the numerous experiments that resulted in no defi¬ 
nite knowledge would be both tedious and unprofitable. To this 
class then will be assigned the repeated efforts to secure eggs of the 
several species by dissection and breeding cages, and the many 
attempts to carry larval forms thru the remaining stages to 
adulthood. 
Fish of various sizes and species are cast up by the waves on 
the lake side of the Point at more or less regular intervals in large 
quantities. Herms* in June, 1906, counted and weighed the 
fish cast up from 5 P. M. to 4 A. M. of one night, along a mile of 
this beach. His report shows a total of 53S fish representing 
some 8 or 10 species and totaling in weight 20.38 kilograms. In 
a few days these are reduced to bones and scales. The forces 
exerting the most active part in this act of sanitation are the dry¬ 
ing influence of the sun, the absorbing power of the sand, the oc¬ 
casional bird visitor, and the very abundant forms of insect life 
* Herms. Jour. Exp. Zool. IV, 45-83. 
525 
