390 EXTERNAL ANATOMY OF INSECTS. 
two grooves, in which the Terebelle or Spicula 
play >. 
E. Terese. (the Zerebelle). Instruments by which 
the insect saws or bores a passage for its eggs to the 
place in which her instinct directs her to deposit 
them”. : 
5. AcuLEus (the Stimg). The above instrument, when 
fitted for an offensive weapon’. It includes, besides 
the Valve and Vaginula before defined, the Spicula. 
A. Sprcuua (the Darts). The proper stings which inflict 
the wound: retractile within the sheath, externally 
serrulate at the apex‘, They include the Retina- 
culum. 
a. RetinacuLuM (the Retinaculum). A minute horny 
moveable scale or plate with which the darts are fur- 
nished, which prevents their dislocation by being 
shot forth too far. . 
vi. APPENDICES (the Appendages). Other instruments 
and organs, with which the anus of various insects 
is furnished. ‘They include—the Forceps, Forfec, 
Furca, Styli, Foliola, Flosculus, Caudule, Fila, 
Mammulea, Papille, and Siphonult. 
1. Forceps (the Forceps). A pair of anal organs that 
open and shut transversely, and meet at their inner 
margin, or at the apex.—Ex. Forficula. Male of 
Phalidura mirabilis *. 
* Pirate XV. Fic. 20. G". 
> [bid. Fic. 20, 21. and XVI. Fie. 1. A". 
© Kirby Mon. Ap. Angl. i. t. xii. Apis**. e. 1. neut. f. 23—25 ; and 
#. xiii. f. 27, 28. 
4 Jbid. t. xiti. f. 30, 31. © Tbid. a. 
f Kirby in Linn. Trans, xii. 469. n. 21. f. xxiii. f. 9. 6 6. (Curculio 
mirabilis.) 
