158 INTERNAL ANATOMY OF INSECTS. 
ceps, which perhaps introduces it a . The Ovipositor of 
Prionus coriarius differs from that of Callidium viola- 
ccwn, and many Capricorns before described l : it consists 
merely of a long bivalve piece ending in a kind of for- 
ceps, and hollowed above into a channel for the passage 
of the eggs c . 
In the Orthoptcra the instrument of oviposition is 
more simple ; in Loaista consisting merely of four ro- 
bust three-sided pieces, two above and two below, the 
former pair at the end curving upwards and the latter 
downwards d , these pieces seem calculated when they 
have entered the earth to enlarge the burrow, and the 
animal appears able to separate them very widely from 
each other e . The ovipositor of Acrida viridissima, which 
like that of many Hymenopterous insects forms a kind 
of appendage or tail to the body, has been described 
both by De Geer and Latreille as consisting of two valves 
only f ; but in reality it consists of six, two upper and 
four lower, as you may ascertain by means of a pin or 
the point of a penknife, which will readily separate them. 
This is confirmed by a figure of Stoll's of a species which 
seems to connect Conocephalus with Gryllus. In this 
the ovipositor is considerably longer than the body of 
the animal, and is composed of six distinct pieces ; viz. 
two external ones stouter than the rest, and within these 
four others finer than a hair and convolute at the apex 5 . 
There is a considerable variety in the shape of the ovi- 
positors of the Acrida and the cognate genera: — thus w 
a DeGeer iv. 143. /. v./. 15. 
» Vol. I. p. 357. " Dc Gcer v. 62. t. Hi./. 12. 
i Platk XV. Fig. 18. " Stoll Sautcrel. t. xxii*. b.f. 87, &c. 
' De Gecriii. 418. /. xxi. /. 10, 1 1. Latr. Gen. Crust, el Ins. iii. 98. 
c Stoll itbi svpr. t. xiii. a./. 51. 
