270 



HEMIPTEEA - HOMOPTBRA. 



niciosus) (fig. 155, i, ii, iii), which attacks all fruit-trees and 

 numbers of other deciduate trees and various plants. One 

 female has been shown to account for 3,216,080,400 young 

 in the year under favourable conditions (Lintner). Numbers 

 of species are injurious in our hothouses, such as the Greedy-* 

 scale (A. eamelUce) and the Oleander-scale {A. nerii), and the 

 two Mealy Bugs {Dacti/lopius n'fri and D. lonr/iaiiinus), but out 



Flo. 155. — San .Tosfi and Mussel Scale. 



i, Male San Jose scale ; ii, larva of same ; iii, female scale ; iv, larva of mussel scale ; 

 v, female mussel scale ; vi, male mussel scale, (i, ii, iii after Marlatt aud Howanl.) 



of doors only two or three ever do much harm. The most 

 prevalent is the Mussel-scale {Mi/fila.'ipi-s pomorum) on apple 

 and pear, the Brown-scale (Leuccmium peisiae), the Oyster 

 Shell Back Louse (A^pid iotus odrecvformis), and the Woolly 

 Currant-scale {Pulvinia viO's), the second on gooseberry and 

 currants, the third on plums, the last on currants, vines, 

 Pyraoanthus, &c. 



The Mussel-scale (Mi/t/laspis pomoi-um). 



This scale insect was at one time placed in the genus 

 Mytilaspis, all of which are elongated scales, more or less 



