cocciD.*:. 



319 



second larval moult. In fig. 298 we have tlip same characters in a 

 female Cliionaspis — viz., a representing the first larval moult, h the 

 second larval moult, and the remainder of the scale as the secretionary 

 portion covering the body of the female. It would be well to study 



Fig. 296.— Fe»u??c swZc o/Diaspis. Fig. 297.— Male scale o/Diaspis. 



u, fust larval nioult ; 6, secretionary portion. 



the detailed characters as given more fully in the description of 

 Chionaspis salicis. 



In figs. 295, 297, 299, male scales or pupari?e are. represented : a 

 shows the larval moult, and h the scale covering the pupa of the male. 

 In addition to the above characters, the student sliould thoroughly 



Fig. 208.- Femoh' scale o/CIiion- 



aspis and Mytilaspis. 



«, first larval moult ; b, second 



larval moult. 



Fig. 299.— Mair mde of 



Cliionaspis. 

 «, first larval moult ; h, 

 secretionary portion. 



master the microscopical characters of the pygidium under a \ in. 

 or \ in. objective. 



The pygidium, it must be remembered, is the anal segment, and 

 after being prepared and mounted the respective characters of dorsal 

 or ventral surface must be well studied. As the whole object is very 

 thin when mounted as a microscopic preparation, it is obvious that 

 careful focussing is required in determining the minute respective 



