HEJnPTKRA. 183 



A. fagi, L, ; Reaum., lb., xKvi, 1. Completely covered with 

 ■white down resembling cotton *. 



Aleyrodes, Lat. — Tinea, Lin. 



Where the antennae are shorter and hexarticulated, and the eyes 

 are emarginated. 



A. proletella; Tinea proletella, L. ; Reaum., lb., II, xxv, 1, 7- 

 Resembling a little Phalpena ; white, with a blackish point and 

 spot on each elytron. Under the leaves of the Chelidonium ma- 

 jus, Brassicae, Oak, &c. 



The larva is oval, much flattened, in the form of a little scale, 

 and resembles that of the Psyllse. The chrysalis is fixed and en- 

 closed in an envelope, so that this Insect undergoes a complete 

 metamorphosis. 



FAMILY III. 



GALLINSECTA. 



In this last family, of which De Geer makes a particular order, 

 there are but five joints in the tarsi f , with a single hook at the ex- 

 tremity. The male is destitute of a rostrum, and has but two wings, 

 which are laid horizontally on the body one over the other ; the ab- 

 domen is terminated by two setae. The female is apterous and pro- 

 vided with a rostrum. The antennas are filiform or setaceous, and 

 most commonly composed of eleven joints %. 



They constitute the genus 



Coccus, Lin. 



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 In- 

 sect are perceptible. These bodies are nevertheless animals of this 

 class and belong to the genus Coccus. Some are females, and the re- 

 mainder young males, the form of both being nearly similar. An 



* M. Blot, corresponding memhev of the Linneaa Society of Caen, had published, 

 in the Meui. de la Soc. Lin. de Caen, 1S24, p. 114, some curious observations on a 

 particular species which is very injurious to the Apple trees in the department of 

 Calvados, by destroying their young shoots. He considers it as the type of a new 

 genus, Mijzoxijle. De Geer had previously described an Aphis of the same tree, but 

 as Messrs. Lepeletier and Serville — Encyc. Method., article Puceron — ^justly remark, 

 that species, although also hurtful to the Apple tree, differs essentially from the 

 preceding one. The abdomen of the other is not furnished with horns ; its antennae 

 are shorter, and, according to M. Blot, present but five joints, of which the second 

 is the longest. We suspect that it re-enters into our third division — Gener. Crust, 

 et Insect. — of the genus Aphis. For the other species, see the works already 

 quoted, and the Faun. Bavar., Schrank. 



t M. Dahn.\n, Director of the Cabinet of Natural History of Stockholm, in a 

 Memoir on certain species of Coccus, presumes that there are three of these joints. 



+ Nine iu the males described in this Memoir. 



