EXPLANATION OF PLATE B. 



Fig. 1. ASPIDIOTUS PERNICIOSUS. (Page 25.) 



This species is the most destructive of all the 

 members of the Diaspinae. The illustration is given to 

 show the remarkable similarity between it and our 

 common A. osfreaformis (fig. 2). Structurally the two 

 insects are very different, but the salient characters of 

 each cannot be seen without proper preparation (see 

 p. 48) and microscopic examination of the insects, 

 which are hidden beneath the scales or puparia. 



Fig. 2. ASPIDIOTUS osTREJM'ORMis. (Page 99.) 



