COCCID^E. 



217 



As the two preceding species are not very common except in one 

 or two special localities, it would be well for the student to study the 

 habits and structure of an easily procurable and closely allied species 

 viz., Aspidiotus ostrecefoi mis on plum, apple, pear, and cherry. 

 This species is very common in many parts of the country. 



In the event of this species not being procurable, the student may 

 find several species of Aspidiotus under glass, as in fig. 206 on Lap- 

 ageria, and fig. 207 on Stephanotis. 



Genus Diaspis. 



This genus has a circular female puparium, and the remains of the 

 larval moults lie between the centre of " scale " and its outer edge. 



Fig. 206. Scale of Aspidiotus on 

 leaf of Lapageria. 



Fig. 207. Scale of Aspidiotus 

 on leaf of Stephanotis. 



Fig. 208. Scale of Aula- 

 caspis rosre on dog-rose. 



The puparium of the male is elongated and strongly ridged, closely 

 resembling the puparium of Chionaspis. 



In this genus proper we have no arboreal species, and the species 

 on wild-rose, long known as Diaspis rosce, has been named Aulacaspis 

 (Diaspis) rosce by Cockered, and Newstead has, somewhat reluctantly, 

 adopted the change. 



Aulacaspis (Diasjns) ro&je (Bouche). 



This scale (fig. 208) is found on the dog-rose (Rosa canina), and 

 sometimes on species of Rubus (bramble). It is fairly common in 



