410 



INSECTS INJURIOUS TO THE ORANGE. 



hatched larvae are very active, and even the adult insect can 

 crawl from one point to another with apparent ease, carrying 

 the scale with it. 



This scale has been found on orange-trees near Santa Bar- 

 bara, and doubtless exists in other localities also. In green- 

 houses it attacks not only the orange but many other plants. 



FIG. 425. 



No. 262. The Common Mealy-bug. 



Dactylopius adonidum Linn. 



The insects known under the name of mealy-bugs form no 

 scale, and are not always stationary, having the power of 

 moving from one place to another; but, since they require the 

 same treatment as scale-insects, it will be convenient to treat 

 of them here. This species of mealy-bug is common in 

 green-houses throughout the civilized world. The female 

 is represented magnified in Fig. 425, 

 with most of the mealy matter re- 

 moved. When full grown, it is about 

 one-eighth of an inch long, white, with 

 a tinge of yellow, a brown band upon 

 the middle of the back, and its whole 

 body powdered with white, floury- 

 looking material. The sides and ex- 

 tremities of the body are armed with 

 spines. The larva, which varies in 

 size according to its age, is of the same 

 form, but flatter. 



The male is a small winged insect, 

 much resembling that of No. 263. 



In Florida it attacks the orange, 

 guava, grape-vine, and pineapple, and prevails to such an 

 extent that it is said few orange-trees have escaped its 

 ravages except those in the interior and southern parts of 

 the State. 



