The Ohio ^J^aturalist, 



and Journal of Science 



PUBLISHED BY 



The Biological Club of the Ohio State University. 

 Volume XV. JUNE, 1915. No. 8. 



TABLE OF CONTENTS. 



Jaques— 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 nimierous 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 538 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 



