COCCIDZE. 
53 
Practically all are clothed in some form of covering, or bear large 
masses of material of their own production. The winged males are cov- 
Fig. 527 —Young and Females, Leoanium 
nigrum, x 3. 
ered only in a thin powdering of wax, as are a few of the females. Many 
have a thicker coat of mealy material ( Monophlebus , Icerya, Pseudococcus , 
etc). ; the bamboo scale (Asterolecanium) has a glassy covering ; the lac 
insects ( Tachardia ) produce an abundant covering of resinous matter; 
the wax scales (Ceroplastes) are enclosed in dense wax in plates ; the shield 
scales, Lecanium , have a thickened dorsal surface, without wax ; and a 
Fig. 528— Lecanium Watti (Left) and Eriocbiton them— 
Ventral. {After Green.) 
large number. (Diaspis, Aspidiotus, etc.) have a scaly covering formed of 
felted threads and cast skins. The colour of this covering is often white 
or grey, rarely brightly coloured or noticeable; the insect within is usually 
HL 48 
