LOCAL DISTRIBUTION OF INSECTS. 511 
rocky and bare ; the arable lands are divided by living 
or dead fences, the latter formed of various materials, 
— or else they are open, and the property only marked 
out by grassy balks, &c. All these places abound in 
shrubs and plants ; some local, and some generally distri- 
buted. But besides the land and its fresh waters, we 
must look also to the sea, and its sandy, pebbly, or rocky 
shores, and the sea-wrack that is cast up upon them ; the 
estuaries that receive its tides ; the brackish waters and 
saline marshes in its vicinity. All the above places, when 
opportunity serves, the Entomologist should explore, for 
in almost all he will find peculiar kinds of insects. 
As mountains and hills have usually their own Flora, 
the insects appropriated to alpine plants can only be met 
with where the pabulum is found. Here also those north- 
ern insects that are impatient of a warmer climate will 
take their station, if they migrate to the southward a . 
The predaceous beetles likewise sometimes frequent a 
mountainous district. Carabus glabratus was first taken 
by Professor Hooker on Ingleborough ; and probably, 
if the Welsh and Scotch mountains were duly investi- 
gated by an Entomologist, many novelties would reward 
his toils. The valleys and plains, especially those of a 
sunny exposition, abound in insects. When the heat of 
the atmosphere indisposes you for motion, you will find 
it no unprofitable or unpleasant employment, lying on 
the grass, to search for minute beetles, which you will 
there find coursing about amongst the tufts and roots of 
the herbage. Thus you may procure many of the Pse- 
laphida, which you would not otherwise meet with. Even 
* See above, p. 49fi. 
