D. 
EXTERNAL ANATOMY OF INSECTS. 389 
. Anus (the Anus). The termination of the abdomen, 
consisting of the two last segments. It includes the 
Podex, Hypopygium, Culus, Ovipositor, and Appen- 
dices. 
. Popex (the Podex). The last dorsal segment of the 
abdomen *. 
. Hyporycium (the Hypopygium). 'The last ventral 
segment of the abdomen >. 
. Cuxus (the Culus). The orifice at the end of the 
anus. 
. Ovivositor (the Oviposttor). The instrument of 
oviposition, by which the insect conducts the eggs 
to their appropriate nidus, and often bores a way to 
it; the same instrument is by some genera used as 
a weapon of offence, when it is called the Aculeus «. 
It includes the Uncz, Tubulus, Valve, Vaginula, and 
Terebella. 
A. Uwct (the Unci). Two pair of robust organs, the 
upper incurved and the lower recurved, with which 
the anus of Locusta is furnished 4. 
. Tuxsuxus (the Tubulus). A tubular ovipositor, con- 
sisting of several pieces often retractile within each 
other, like the tubes of a telescope *. 
C. Vatv (the Valves). Two lateral lamine, often coria- 
ceous, by which the ovipositor when unemployed is 
covered f. 
Vacinuta (the Sheath). A corneous case, with 
* Prate VIII. Fic. 5, 15. K'. > Ibid. Fic. 6, 15, 18. L!. 
© Pirate XV. Fic. 18—22. and XVI. Fic. 1—3. 
4 Prate XV. Fic. 18. EZ’. 
© Ibid. XV. Fic. 22. and XVI. Fie. 2, 3. 
f Ibid. Fic, 20. 21. and XVI. Fic. 1. F"’. 
