312 MOTIONS OF INSECTS. 
Such is the velocity with which it runs, that it appears 
rather to glide or fly than to use its legs. 
When insects walk or run, their legs are not the only 
members that are put in motion. They will not, or 
rather cannot, stir a step till their antennee are removed 
from their station of repose and set in action. When the 
chafers (Scarabeus, L.) are about to move, these organs, 
before concealed, instantly appear, and the laminae which 
terminate them being separated from each other as 
widely as possible, they begin their march. They em- 
ploy their antennze, however, not as feelers to explore 
surrounding objects,—their palpi being rather used for 
that purpose,—but, it should seem, merely to receive 
vibrations, or impressions from the atmosphere, to which 
these laminae, especially in the male cockchafers (Melo- 
lonthe, F.) present a considerable surface. Yet insects 
that have filiform or setaceous antennee appear often to 
use them for exploring. When the turnip-beetle (Haltica 
oleracea, ¥'.) walks, its antennze are alternately elevated 
and depressed.—The same thing takes place with some 
woodlice (Onzscide), which use them as tactors, touching 
the surface on each side with them, as they go along. 
This is not however constantly the use of this kind of 
antennze; for I have observed that Telephorus lividus,— 
a narrow beetle with soft elytra, common in flowers,— 
when it walks vibrates its setaceous antenne very briskly, 
but does not explore the surface with them. The para- 
sitic tribes of Ichneumonida, especially the minute ones, 
when they move vibrate these organs most intensely, and 
probably by them discover the insect to which the law 
of their nature ordains that they should commit their 
egos; some even using them to explore the deep holes 
