HEMIPTERA. 153 



oranges. Parlatoria proteus has been found only on exotic plants 

 in conservatories. Parlatoria zizyphi is an exotic species which is 

 often found on imported oranges. Uhleria camtllice is a trouble- 

 some pest of the camellia in conservatories. Aspidiotus parlato- 

 roidcs infest the Bay Tree in Florida. And Chiondspis bicldvis is a 

 remarkable species, which I found burrowing beneath the epidermal 

 layer of certain exotic plants in the conservatories at Washington. 



Family III. ALEYRODID.E.* 



(A ley r odes.) 



The insects of the genus Aleyrodes were for a long time classed 

 with the Coccidae. In their immature state they are scale-like in 

 form (Fig. 131), and often somewhat resemble certain species of 

 Lecanium. But the mature insects differ so 

 much from Coccids that the genus has been 

 separated as a distinct family. They are very 

 small insects ; the species with which I am 

 acquainted have an expanse of wings of about 

 three millimeters. Both sexes are winged ; 

 and, as with other Hemiptera except the 

 Coccids, there are two pairs of wings. In the 

 adult state, all the species are of nearly the FIG. 131.- 

 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 

 which gives the name to the genus. 



With the adults the eyes are reniform, and generally divided 

 into two portions, separated by a membrane ; in some species they 

 are more or less rounded or triangular. Above each eye there is a 

 minute ocellus. The rostrum is stout, and composed of three seg- 

 ments. The antennae are seven-jointed. The wings in repose are 

 carried nearly horizontally. The first pair are the larger, and are 

 traversed by two veins ; the first vein, which passes through the mid- 

 dle of the wing, is much the larger; the hind wings have only a 

 single vein. 



AleyrSdidse, AleyrOdes: ahurodes (dXevpvSet), like flour. 



