HOMOPTERA. — ALEYRODID&. 443 

tubercled, corniculate, nor furnished with long threads at the tip; the 
four wings are broadly oval, nearly of equal size, covered with a 
white powder, the anterior having only one strong central nerve* ; in 
repose they are carried nearly horizontally (fig. 118. 2.); the legs are 
short and simple; the tarsi 2-jointed, with two ungues (fig. 118. 5.). 
The transformations of this genus are extremely interesting, agreeing 
with those of the male Coccus in the scale-like form of the larva, totally 
unlike the imago (fig. 118. 6. after Burmeister), and in the quiescent 
state of the pupa covered by the skin of the larva. We are indebted to - 
Réaumur for a minute account of the habits of this insect (Mémoires, 
tom. ii. mém. 7. pl. 25.), which feeds, in the larva state, on the leaves 
of Chelidonium majus, the cabbage, oak, &c., and of which the larve 
and pupe are devoured by a minute Coleopterous larva, apparently 
from Réaumur’s rough figure of the imago belonging to the Coccinel- 
lideous genus Scymnus. The type of the genus, A. Chelidonii, was 
regarded by Linnzus as a Tinea (Ph. T. proletella, Syst. Nat. vol. ii. 
p-889.). Réaumur has given a calculation of the number of indivi- 
duals produced from a single female, showing that in twelve gene- 
rations the number is at least 200,000 in one year; hence, Linnzus 
observes, “ Parit quotannis 200,000 soboles, dum 12 progenies ponant 
12 ova singule.”+ These eggs, varying in number from eight to 
thirty-six, are arranged around a circular space, covered with white 
powder, on the undersides of the leaves. 
G.N. 1437. Pinicola and Aleyrodes gigantea and dubia of Ste- 
phens’s Catalogue are species of the Neuropterous genus Coniopteryx. 
* Burmeister has incorrectly represented them with nerves similar to those of 
Coccus, (Handbuch d. Ent. vol. ii. t. 2. f. 7.) 
+ Kirby and Spence, overlooking this calculation, give 200,000 as the number of 
eggs produced by a single individual. (Introd. to Ext. vol. iii. p. 89.) 
