10 



CROP PEST COMMISSION OP 



tion, which is surrounded by a fine groove or depression. This 

 nipple-like prominence in the center, together with the ring sur- 

 rounding it, is quite characteristic of this species and enables ono 

 familiar with the pest to recognize it readily in the majority of 

 cases. 



If the scale be gently lifted with a knife-point or a pin, a 

 yellowish soft-bodied insect, devoid of both legs and wings, will 



FIG. 7. Adult female, before development of eggs : a, ventral view, show- 

 ing long sucking mouth parts : b. posterior margin of anal segment as seem 

 under microscope greatly enlarged. (After Howard and Marlatt, Bui. No. 3, 

 n. ser., Div. of Entomology, U. S. Dept. of Agriculture.) 



be found beneath it. This is the insect itself, the creature which 

 really does the damage. The male scale, while rather closely re- 

 sembling that of the female, is somewhat smaller and is more 

 elongated. 



When the scales occur abundantly upon a twig or limb, the 

 latter has the appearance of having been dusted over with ashes. 



