EXTERNAL ANATOMY OF INSECTS. By) 
tail acting as an alembic for that purpose. This ma- 
chine consists of six angular joints including the sting, 
the last but one being the longest, and the last inflated, 
as it were, at the base and terminating in a sharp subu- 
Jato-conical point which curves downwards, and has an 
orifice in a channel at the end on each side. ‘Treviranus 
could not discover these orifices in the sting of Scorpio 
curope@us *; they may however be readily seen if viewed 
with a sufficiently high power, though not under a 
common pocket microscope. Whether the very slender, 
many-jointed, veal tail of the remarkable genus Thely- 
phonus is used in any respect as a weapon, has not been 
ascertained : it is a filiform hairy organ consisting in 
some specimens of more than ¢wenty joints, the first 
being very much larger than the rest. 
6. Appendages*. We are lastly to advert to those 
appendages of the abdomen of which the use is not at 
present discovered. ‘These are the styles (stylz) of the 
Staphylinide ; the leaflets (foliola) of the Lzbellulina ; 
the floret (flosculus) of the Fulgori ; the cerci of the 
Blattina and Gryllina; and the threads (fila) of Ma- 
chilis: but having nothing important to add concerning 
them, the definitions of those terms will give you a suf- 
ficiently clear idea of them‘. As they are common to 
both sexes, if their use is connected with the sexual in- 
tercourse, it must be similar to that which Treviranus 
* Treviranus, wbi supr. 14. 
» In my specimen including the first joint there are twenty, and 
some seem to have been broken off. In Roemer’s figure (Genera, 
#, xxix. f. 11.) there are only fen. Perhaps they vary in number ac- 
cording to the age of the animal. 
¢ Prate XV. Fic. 13, 16, 17. 
4 See above, p. 391—. 
