23 



THE ROSE SCALE. 

 {Aulacaxpix rosse Sandberg — fig. 12.) 

 This species is similar to the peach scale, and, indeed, the easiest 

 way to distinguish between them is by their host plants. The peach 

 scale does not affect the host plants of the rose scale, which are roses, 

 raspberry, and blackberry. The scale covering is much more thin and 

 delicate and the exuvium is usually of a paler or duller yellow than 

 in the case of the peach scale. The keel or ridge of the male is more 

 distinct. The life history of this species does not appear to be well 

 known in this country. It winters, as a rule, in the egg as far north 

 as New Jersej^; but mature females and immature females and males 

 may be found in winter. In the early spring one 

 often linds the female scales surrounded by a radiate 

 row of male scales. It is probable that there is more /ftW I 



than one brood in a year, at least in the South. 



FAMILY AFHID^ (PLANT-LICE). i\Mllj 



The plant-lice are small, sluggish insects found on l}wSWi 



the under surface of leaves or on the bark and roots. ^§j 



Most of the individuals have no wings, but at times m r i 



one finds some specimens with delicate transparent % ^Kf 



wings laid roof -like over the body. They all have 1 ^f' 



distinct legs, a pair of moderately long antennse, and |i "^ 



usually quite prominent eyes. They occur in colo- M a 



nies, and by their numbers often do a considerable '"■''' "• 

 amount of damage. The eggs are found on trees in 



winter situated near the base of twigs and buds. (See F 



fiff. 13.) They are minute, oval, or elliptical shining fig. i3.-Eggs of ». 



° T^ . ,1 i i! j.1. iu plant-louse on twig. 



black objects. During the warm part of the year the (original.) 

 females produce living young, so that one' individual 

 may, in a few months, be the parent of a large colony. Many of the 

 species secrete a sweetish liquid from two pre-apical tubes or cor- 

 nicles. This liquid is known as honey-dew, and attracts other insects, 

 especially ants. 



TABLE OF PLANT-LICE. 



A. Plant-lice on the bark or roots: 



With a whitish, woolly, or cottony covering Schizoneura lamgera. 



Without such covering Aphis persicse-niger. 



B Plant-lice on the leaves: 



With bluish-white mealy powder; on plum Syalopierus prum. 



Dark brown; on cherry Myzus cerad. 



Green, or faintly reddish ; on apple -^phi^ rimh and A . wrbi. 



