B52 MOTIONS OF INSECTS. 
Cimicide, comprehending besides the Linnean genus 
Cimex, Notonecta; Sigara; Nepa; Ranatra; and Nau- 
coris of Fabricius. The posterior tibize of some of this 
last division (Lygaus phyllopus, foliaceus, &c., F.) are 
furnished on each side with a foliaceous process—which 
may act the part of out-riggers, and assist them in their 
flight?. - I can give you no particular information with 
respect to the aérial movements of the insects of this 
order: the British species that belong to it are generally 
so minute that it is not easy to trace them with the naked 
eye; and unless some kind optician, which is much to be 
wished, would invent a telescope by which the pro- 
ceedings of insects could be examined at a distance, there 
is no other way of studying them. 
The four wings of the next order, the Trichoptera or 
case-worm flies, both in their shape and nervures re- 
semble those of many moths>; only instead of scales 
they are usually covered with hairs, and the under wings, 
which are larger than the upper, fold longitudinally. 
Some of these flies, I have observed, move in a direct 
line, with their legs set out, which makes them look as 
if they were walking in the air. In flying they often ap- 
ply their antennz to each other, stretching them out 
straight, and thus probably are assisted in their motion. 
The Lepidoptera vary so infinitely in the shape, com- 
parative magnitude, and appendages of their wings, 
that I should detain you too long did I enlarge upon so 
multifarious a subject. I shall therefore only observe, 
that one species is described, both by Lyonet and De 
Geer® (Phalena hexaptera, ¥.?), as having six wings; 
2 PLate XV. Fie 2. > Pirate III. Fic. 4. 
© Lesser, L.1. 109, note *. De Geer, ii. 460—. #. ix. f. 9. 
