516 EXTERNAL ANATOMY OF INSECTS. 
The Pedicellus* is the second, and may be deemed the 
least conspicuous joint of the antenna. Though more 
slender than the scape, it is generally thicker than that 
which immediately follows it. In broken antennee it is 
the hinge or pivot on which the clavola or upper mem- 
ber turns, and is then often longer than the succeeding 
joints: it is usually very short, campanulate or bell- 
shaped, or obconical; but ina species of bug (Scutel- 
lera, S. pedicellata, K. MS.) from New Holland, it is 
nearly as long as all the rest of the joints taken together. 
In those species of Lycus, a genus of beetles related to 
the glow-worm, that have flattened antennee (as L. reti- 
culatis, fasciatus, &ce.), this joint is almost received into 
the socket of the scape, so that their antennze appear at 
first to have only zen joints, but in those which have 
those organs filiform (as L. minutus, Aurora, &c.) it is 
more conspicuous. 
The Clavola”, or remaining joints of the antennae 
taken together, constitutes the principal part of the or- 
gan, which, especially at its extremity, exercises its func- 
tions of touch, or any other sense. The principal varia- 
tions, as to form and structure, that occur in this part 
will be mentioned in another place. I shall only here 
observe, that in many instances the first jomt of this part 
is longer than the rest; but in Scutellera pedicellata just 
mentioned, it is by far the shortest, and shaped like the 
pedicel of most insects. In the Libellulina, the Homo- 
pterous Hemiptera, and those flies whose antennz ter- 
minate in a bristle, the clavolet is represented by the 
bristle. But in the flies which have a lateral bristle, on 
the last joint, and those with triarticulate antennz that 
* Pirates XI, XIE, XXYV, I’. b Ibid. m’. | 
