526 



HEMIPTEEA. 



Crustacea, and like them, they can scarcely be referred to the 

 type of Articulates at all, while other forms, such as C. cacti 

 in its larval state, resemble Glomeris, or the Isopods, among 

 Crustacea. On the other hand the males have been mistaken 

 for some Neuroptera, and the male Coccus, with its long anal 

 stylets and the single pair of fore wings, mtiy be likened to 

 an Ephemera. The genera Aspidiotus and Lecanium are par- 

 thenogenous, as in the Apliidm . 



In Aleurodes both sexes are winged and of similar form, the 

 antennaj are six-jointed, with the second joint lengthened, and 



in the fore wings, 

 which are spread out 

 as in Lepidoptera, 

 there is but a single 

 vein, the median. "We 

 / have received from 

 Mr. J. L. Eussell 

 specimens of A. va- 

 porariavi which oc- 

 curred in great num- 

 bers on his house- 

 plants and especially 

 Fig. 526. on the tomato leaves. 



The winged forms appeared early in September. The larvje 

 are green and scale-like, rounded OA'al, and the pupt^ retain the 

 same form and are smooth beneath, but Avith minute hairs 

 above and on the edges. The adult is j-ellowish white, with 

 snow-white wings, and is about .04 of an inch in length. 

 The body of the imago nearly formed, 

 with black eyes, can be seen through the 

 thin pupa skin. In Dortliesia the males 

 only are provided with wings ; the an- 

 tennae are long, nine-jointed, and the 

 abdomen is oval, ending in a bushy mass 

 of threads. The genus Coccus differs in 

 that the two-winged males have ten- 

 jointed antennae and two anal bristles. 

 The females have nine-jointed antennae, and are covered with a 

 flattened, hemispherical scale. The Cochineal insect, Coccus 



