1896.] 



MICROSCOPICAL JOURNAL. 



325 



lating iudividnals the development has been most care- 

 fully traced. 



After being expelled, the larva remains motionless for 

 a little while, with antennae and legs folded beneath the 

 body. It soon hardens enough to run about, and forc- 

 ing its way from the parent scale, it travels over the 

 plant to find a suitable place to settle. The newly born 

 larva (fig. 6.) is a microscopic creature of pale orange 

 color with long oval body havingsix legs and two feel- 

 ers. The long thread-like probosis with which it sucks 

 the juices of plants is doubled on itself and lies in a cav- 

 ity in the body, only a tip projecting. 



After crawlins; about for a few hours the larva settles 



FIGURE 3. 



(^hiouaspis furfurus or Scurfy Bark Louse : a, c, females ; b, fl, males — a, b, natural skte ; c, d, 

 enlarged. 



down and slowly works its long bristle-like sucking beak 

 through the bark, folds its legs and antennae beneath its 

 body and contracts to a nearly circular form. The se- 

 cretion which forms the scale now begins to exude from 

 all parts of the body in the form of very minute white 

 fibrous waxy filaments (fig. 6) which rai:)idly become more 

 numerous and dense. At first the orange color shows 

 through this waxy covering, but within two days' time 



