The Descent of Man

hed, so that he is thus enabled to seize her without
injury. (4. Mr. Walsh, ibid. p. 107.) One of
the stag-beetles of North America (Lucanus
elaphus) uses his jaws, which are much larger
than those of the female, for the same purpose,
but probably likewise for fighting. In one of the
sand- wasps (Ammophila) the jaws in the two
sexes are closely alike, but are used for widely
different purposes: the males, as Professor
Westwood observes, "are exceedingly ardent,
seizing their partners round the neck with their
sickle-shaped jaws" (5. 'Modern Classification
of Insects,' vol. ii. 1840, pp. 205, 206. Mr. Walsh,
who called my attention to the double use of
the jaws, says that he has repeatedly observed
this fact.); whilst the females use these organs
for burrowing in sand-banks and making their
nests.
[Fig. 9. Crabro cribrarius. Upper figure, male;
lower figure, female.]