1896.] 



MICROSCOPICAL JOURNAL. 



^25 



lating iudiviJuals tlie development Ims been most care- 

 fully traced. 



After being expelled, tlie larva remains niutiunless for 

 a little while, Avitli antenna^ 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 

 l)lant to find a suitable place to settle. The newly born 

 larva (fig. 6.) is a microscopic ci'eature 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 crawlino; about for a few hours the larva settles 



(!Uii)nasi)is furfurus or Scurfy Bark Louse : a, o, fuiiiales ; b, fl, males— a, b, uatiiral siae ; c, d, 

 eularged. 



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 

 jBbrous wax}' filaments (fig. 6) which raj)idly become more 

 numerous and dense. At first the orange color shows 

 through this waxy covering, but within two days' time 



