THE COCCIDAE OF OHIO, I 



INTRODUCTORY. 



This paper is the result of two years' study of the Coccidae 

 in the Ohio State University Zoological Laboratory, under the 

 able direction of Prof. Herbert Osborn, who has devoted much 

 time to the study of the Hemiptera, of which Order the Coccidae 

 comprise a comparatively small group. 



It has been the plan of the author to arrange the paper in 

 the form of an illustrated manual, furnishing keys and descrip- 

 tions for the species reported in Ohio. Several species were not 

 deemed sufficiently important to require an extended description 

 and a figure. In the course of the work the author has added 

 32 species to the Ohio list, including six species new to science. 

 One of these {Aspidiotus glandidiferus) was described by Prof. 

 Cockerell, and five {Phenacoccus oshorni, Chionaspis gleditsiae, 

 Ch. sylvatica, Aspidiotus piceus and Orthezia solidaginis) were 

 described by the author. 



On account of the lack of specimens and literature at hand, 

 the author omits the Coccinae in this paper except to list the re- 

 corded species, hoping in another year to work up this group in 

 similar manner. Any assistance in the way of specimens or 

 literature will be gratefully received. 



In illustrating the Diaspinae, the author has shown on one- 

 half of the drawing the dorsal, and on the other half the ventral 

 surface, and has endeavored to be as accurate as possible in 

 delineating the relative size and position of the gland-orifices, 

 both dorsal and ventral. 



The male scale has been described immediately after the 

 female scale, it seeming proper to give first the superficial charac- 

 ters of each one before passing to the microscopic characters 

 of either one. 



* Presented to the Faculty of the College of Arts, Philosophy and Science of the Ohio 

 State University as the thesis requirement for the degree of Master of Arts. June, 1903 

 Contributions from the Department of Zoology and Entomology, No. 18. 



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