250 
SYSTEMATIC ARRANGEMENT. 
in Surinam, and other parts of America, as well as 
in Africa and Asia. In some of them the tegmina 
and -wings are of great amplitude, and the powers of 
flight are probably considerable ; they are likewise 
ornamented with rich colours, frequently rendering 
them very ornamental objects. The similitude, of 
these parts, to the leaves of trees, formerly mentioned 
as signalising the Orthopterous order, is also conspi- 
cuous in the present tribe, particularly in that section 
of it, which, in allusion to this very circumstance, 
Kirby has proposed to name Pteropkylla , or leaf- 
wings. 
Grasshoppers deposit their eggs in the earth, an 
operation which they accomplish by means of the 
lengthened ovipositor, which forms one of their dis- 
tinctive features. This instrument is slightly modified 
in form in the different genera. In Acrida, it con- 
sists of six pieces or valves, tw r o upper and four low r er ; 
each of which is grooved internally, and these are 
moved backwards and forwards alternately, w T hen 
employed in boring. The eggs are rather long, and 
narrowed at both ends ; they are laid in considerable 
quantities at a time, and extruded together along with 
a kind of mucous matter, which soon dries and be- 
comes a slender membranous envelope. The nymph 
or pupa does not differ from the larva, except in 
hearing on the back a pair of rudimentary wings, 
enclosed in a kind of sheath. The larvsB and pupa 
are, of course, incapable of flight, but the mature in- 
sect springs into the air with great facility, and ex- 
panding its capacious w r ings, can sustain itself for a 
