456 



AN INTRODUCTION TO ENTOMOLOGY 



The purple scale, Leptdosaphes pinncBjormis. — This scale-insect is 

 well known in the orange-growing sections of this and of other 



ImUS. 



Fig. 534. — Chionaspis pinifolicE: 2, scales on Pinus strobus, natural size, leaves 

 stunted; 2a, leaves not stunted by coccids; 2h, scale of female, usual form, 

 enlarged; 2c, scale of female, wide form, enlarged; 2^, scale of male, enlarged. 



countries. It is one of the two most common scale-insects found on 

 citrus trees in Florida. The scales of this species are represented in 

 Figure 536; they are represented natural size on the leaf, and greatly 

 enlarged in the other figures. The scale of the female 

 is long, more or less curved, and widened posteriorly 

 (Fig. 536, zaand/fe); the first of these two figures repre- 

 sents the dorsal scale, and the second the ventral scale, 

 which is well developed in this species. Some eggs can 

 be seen through a gap in the ventral scale. The scale 

 of the male (Fig. 536, ic) is usually straight or nearly so. 

 At about one-quarter of the length of the scale from the 

 posterior extremity, the scale is thin, forming a hinge 

 which allows the posterior part of it to be lifted by the 

 male as he emerges. While this insect is chiefly known 

 as a pest of citrus trees, it has been fotmd on several 

 other species of plants. It has been described under several different 

 names; for a long time it was known as Mytilaspis citricola. 



Fig. 535-—-^^ 

 orinia fiorimcB 



