78 OHIO STATE ACADEMY OF SCIENCE. 



EXPLANATION OF PLATES. 



Wherever in illustrating the Diaspinae, a vertical line is 

 drawn through a figure, the dorsal surface of the pygidium is 

 shown on the left side and the ventral on the right. The figures 

 are numbered consecutively, and no mention is made of the 

 various plates in the descriptions. 



The majority of the plates were designed before Mrs. Fer- 

 nald 's ' ' Catalogue of the Coccidae of the World ' ' was published, 

 hence some of the names inserted with the drawings are to be 

 disregarded, and the following ones adopted : 



Plate I. (Original) 



Pygidium of Aspidiotus forbesi Johns. 

 Part of same enlarged. 

 Aspidiotus ostreaeformis Curt. 

 Aspidiotus perniciosus Comst. 

 Aspidiotxis ancylus Putn. 

 Aspidiotus uvae Comst. 

 Aspidiotus juglans-regiae Comst. 

 Aspidiotus glanduliferus Ckll. 

 Aspidiotus comstocki Johns. 



Plate II. (Original) 



Aspidiotus hederae (Vail.) 

 Aspidiotus hederae (Vail.) 

 Aspidiotus cyanoyhylli Sign. 

 Chrysomphalus aonidum (Linn.) 

 Chrysomphalus obscurus (Comst.) 

 Chrysomphalus aurantii (Mask.) 

 Chrysomphalus aurantii (Mask.) 

 Chrysomphalus dictyospermi (Morg.) 



Plate III. (Original) 



Aspidiotus lataniae Sign. 



Aspidiotus cydoniae crawii Ckll. 



Aspidiotus rapax Comst. 



Fiorinia fioriniae (Targ.) 



Aspidiotus ulmi Johns. ^ 



Parlatoria zizyphus (Lucas). 



Parlatoria pergandii Comst. 



Comstockiella sabalis (Comst.) 



