HEMIPTERA. 1 63 



be dissolved and washed down by the rains. This will serve 

 to destroy certain other pests, as well as the woolly aphis. 

 In case it is desired to rid an infested tree of this pest, the 

 trunk form should be washed off with a strong solution of 

 soap applied with a sponge, taking care to destroy all eggs ; 

 and the ground should be treated with carbon bisulphide, as 

 for the Grape Phylloxera. 



Family ALEYRODID.E (Al-eu-rod'i-dse). 



The A ley r odes {Al-eu-ro' des). 



The insects of the genus Aleyrodes were for a long time 

 classed with the Coccidse. In their immature state they are 

 scale-like in form (Fig. 200), and often somewhat resemble 

 certain species of Lecanium. But the ^^^^^^^^^^^ 

 mature insects differ so much from the ^^^H|Hf||^^^H 

 Coccids that the genus has been sepa- ^HKi^j^S^H 

 rated as a distinct family. They are very ^^^I^^HK^^^^B 

 small insects; the species with which I '^^M^HB^^H 

 am acquainted have an expanse of ^^wypHp^;:^^H 

 wines of about one eighth of an inch. ^^HK|^li|^#|^^| 

 Both sexes are winged ; and, as with ^^^^^^^^^^^ 



, ^^ . , , A^ r^ 'J Fig. 200. — Aleyrodes 



other Hemiptera except the Coccids, 



there are two pairs of wings. In the adult state, all the 

 species are nearly of the same color ; the wings are white, 

 sometimes spotted ; the body is usually yellowish, sometimes 

 pinkish, and more or less spotted with black. The most 

 striking character presented by the adults, in addition to the 

 fact that both sexes are winged and each has two pairs of 

 wings, is the presence of a whitish powder with which the 

 wings and body are covered. It is this character that 

 suggests the name of the ge.nus, which is from the Greek 

 aleurodes, like fioun 



