388 Annals Entomological Society of America [Vol. V, 
WAX GLANDS. 
(Plate XXVIII, Fig. 6.) 
The wax glands are scattered pretty well over the body, 
especially on the dorsal aspect of the thorax and on the dorsal 
and lateral aspect of the last three segments of the abdomen. 
There are two kinds of glands, the most numerous consist- 
ing of a single more or less balloon-shaped or oval cell with an 
external chitinized pore. This cell contains several nuclei and 
very faint longitudinal divisions, each division containing one 
of these nuclei. The external pore is very heavily chitinized, 
and is more or less horse-shoe-shaped with semi-circular chit- 
inized structures lying on each side of the horse shoe. 
The second kind of wax glands has the chitinized pore or 
tubercle prolonged into a long, stout spine at the base of which 
is a cup-shaped secretory gland. 
EXPLANATION OF PLATE XXVIII. 
Anatomy of Icerya purchasi. 
Fig. 1: Mouthparts. 
Fig. 2. Salivary glands. 
Fig. 8. Alimentary canal and malpighian tubules. 
Fig. 4. Cross section of ventriculus. 
Fig. 5. Reproductive system. 
Fig. 6. Wax gland. 
Fig. 7. Respiratory system; a, anterior aspircle and trachea; b, posterior spiracle 
and trachea. : 
