404 INSECTA. 



observed on the shoots of the lime tree, the leaves of gooseberry bushes, apple 

 trees, and particularly those of the elm, poplar, and pistachio, in which they 

 produce vesicles or excrescences enclosing colonies of Aphides, and frequently 

 an abundant saccharine fluid. Most of these insects are covered with a 

 farinaceous substance, or cotton like filaments, sometimes arranged in bundles. 

 The larva? of the Hemerobii, those of several Diptera, and of Coccinellu*, 

 destroy immense numbers of Aphides. 



A. (jurrcuit, Lin. Brown ; remarkable for its rostrum, which is at least 

 thrice as long as the body. 



A- Jagi, Lin. Completely covered with white down resembling cotton. 



FAMILY III. 

 GALLINSECTA. 



IN this last family there are but five joints in the tarsi, with a single hook 

 at the extremity. The male is destitute of a rostrum, and has but two wings, 

 which are laid horizontally on the body, one over the other ; the abdomen is 

 terminated by two setse. The female is apterous and provided with a rostrum. 

 The antennae are filiform or setaceous, and most commonly composed of 

 eleven joints. 



They constitute the genus 



Coccus, Linnaits. 



The bark of various trees is frequently covered with a multitude of little 

 oval or rounded bodies, in the form of fixed shields or scales, in which, at the 

 first glance, no external organs indicative of an insect are perceptible. These 

 b dies are nevertheless animals of this class and belong to the genus Coccus. 

 Some are females, and the remainder young males, the form of both being 

 nearly similar. An epoch, however, soon arrives in which all these individuals 

 experience singular changes. They then become fixed ; the male larva? for a 

 determinate period, requisite for their ultimate metamorphosis, and the females 

 for ever. If we observe the latter in the spring, we shall find that their body 

 gradually increases to a great volume, and finally resembles a gall-nut, being 

 sometimes spherical, and at others reniform or scaphoid. The skin of some is 

 smooth and level, that of the remainder presents incisures or vestiges of seg- 

 ments. They slip their eggs between the skin of their abdomen, and a white 

 down which covers the spot they occupy. Their body then becomes desic- 

 cated and forms a solid crust or shell which covers their ova. Other females 

 protect theirs by enveloping them with a white substance resembling cotton. 

 Those which are spherical form a sort of box for them with their body. The 

 young Cucci have an oval body, much flattened and furnished with the same 

 organs as that of the mother. They spread themselves over the leaves, and 



