250 



rXSECTS INFESTING THE PINE. 



Fig. 236. 



Fig. 237. 



Fig. 28.5. — Norfolk Island Pine Scale (Figs. 1 to Ih) ; 1, an 

 infested twig ; la, the male — colors, white and hrown ; ife, 

 the hind end of the body of the male ; ic, hind end of the body 

 of the female ; Id, the adult female — color, yellow ; Ih^ her 

 antenna? ; Ig, her spinnerets ; If, one of her legs ; Ic, por- 

 tion of the leg of a male ; all highly magnified. Oak Scale 

 (Ehizococcua quercus) (Figs. ~ to ^/>) ; ~, an infested twig ; 2a 

 spinnerets of a female, highl}^ magnified ; 2b, one of her legs, 

 greatly enlarged. 



The scales (Fig. 235, -?,) are nearly circular, white, and measure 

 about two sixteenths of an inch in diameter. The larva (Fig. 

 236) is of a light amber color, and altout one-hundredth of an 

 inch long ; it is provided with two long anal setae, and appears 

 to be covered with very fine armor-like plates or scales. 

 Fig.' 236. — Larva 



of Norfolk Island 



Pine Scale, enlarg- 

 ed — color, light am- 



lier. 



Fig. 237. — Male 



Norfolk Island Pine 



Scale Insect ; enlarg- 



ed — color, dark- 



brown. 



The adult female (Fig. 235, Id,) is of a yellowish color. 

 The adult male (Figs. 237 and 235, la,) is of a whitish-yellow, 

 marked with dark lirown ; wings nearly transparent ; antennflp 

 ten jointed; two long filaments jtrotrude from the anal seg- 

 ment, in the place of the anal stylet, wliirh is found in some 

 species descril)ed in this work. 



" When the female is ready to lay lier eggs slie excretes a 

 cocoon-like covering to the body. comj)Osed of white silken 

 threads. The sac is dense like felt Imt easily torn : it is ojien 

 on the middle line of the ventral surface, or very niueli more 

 delicate on that part. It adheres to the tree quite firmly, 

 remaining where excreted after the death of the insect. As 

 the eggs are laid, thi' body of the female shrinks away, mak- 

 ing rooin for them, and linnlly it becomes a very small pellet 



^^ 



