On the Japanese Species allied to the San José 

 Scale in America. 



BY 



Peof. C. Sasaki. 



Agricultural College, Imperial University Tokyo, Japan. 



After the detailed study of the San José Scale or pernicious scale 

 (Aspidiotus perniciosus, Comstock) hy Prof. J. H. Comstock in 1880, 

 the same subject has been investigated by several American entomolo- 

 gists, and many papers upon it, have appeared in both America and 

 Europe on both scientific and economic grounds. 



By Insect Life (No. 5 Vol. VI. 1894), and Bulletin (No. 3 new series 

 1896) published at the U. S. Department of Agriculture, we learn that 

 the pernicious scale was at first only confined to the Pacific Coasts of 

 United States thus giving there a great harm to the orchards ; but 

 the pest has now extended to the east so far as the north of Washington 

 and also to the Mexican border at the south. 



In regards to the original home of the pernicious scale, there are 

 several opinious among Americans and its exact home seems to remain 

 still undecided. In the Insect Life 1 it is stated thus : — " Mr. Coquillet 

 states that its origin is uncertain, but the fact of its being so frequently 

 found upon plants imported from Japan would seem to point to that 

 country as its original home." Later Messrs. L. O. Howard and C. L. 

 Marlatt 2 made public their opinion of its native home, which I quote 

 in the following lines : — " Mr. Maskell informs us in recent communica- 

 tion that he has received the San José Scale on apple twigs from Mr. 

 French at Melbourne, and also that the scale received from Mr. French 

 on peach twigs from same locality, and which he described under the 

 name Aonidia fusca (Trans. New Zealand Institute, Vol. XXVII, 1894 



