HEMIPTERA. 51 
cences enclosing colonies of Aphides, and frequently an abundant 
saccharine fluid. Most of these Insects are covered with a farina- 
ceous substance, or cotton-like filaments, sometimes arranged in bun- 
dles. The Jarve of the Hemerobii, those of several Diptera, and of 
Coccinelle, destroy immense numbers of Aphides. M. A. Duvau 
has communicated to the Académie des Sciences, the interesting re- 
sult of his researches on* these Insects. His Memoir has been in- 
serted in the Annales du Muséum d’Histoire Naturelle. 
1. quercus, L.; Reaum., Insect., III, xxviii, 5,10. Brown; 
remarkable for its rostrum, which is at least thrice as long as 
the body. 
| A. fagi, L.; Reaum., Ib., xxvi, 1. Completely covered with 
white down resembling cotton(1). 
Axeyropes, Lat.—Trvna, Lin. 
Where the antennz are shorter and hexarticulated, and the eyes 
are emarginated. 
A. proletella; Tinea proletella, L.; Reaum., Ib., II, xxv, 1, 7. 
Resembling a little Phalena; white, with a blackish point and 
spot on each elytron. Under the leaves of the Chelidonium 
majus, Brassice, Oak, &c. 
The larva is oval, much flattened, in the form of a little scale, 
and resembles that of the Psylle.. The chrysalis is fixed and 
enclosed in an envelope, so that this Insect undergoes a complete 
metamorphosis. 
{1) M. Blot, corresponding member of the Linnean Society of Caen, had pub- 
lished, in the Mém. de la Soc. Lin. de Caen, 1824, p, 114, some curious observa- 
tions 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, Myzoryle. De Geer had previously described an Aphis of 
the same tree, but as Messrs Lepeletier and Serville—Encyc. Méthod., 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 fur- 
nished with horns; its antenne 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. Bayar., Schrank. 
