Reproduction
The courtship between male and female Promachus
vertebratus is typically minimal as the male
simply attacks the female like it is prey. Copulation then
begins with tail-to-tail contact, where the genitalia interlock.
The male genitalia is black, while the female's is typically
shiny black (Hines J. S. 1911). This new pair has no problem
flying, if necessary, during this process; the male will usually
tow the female along.
After fertilization, the female begins laying
small, cream-colored eggs on grass or other plants, soil, bark,
or wood. These
eggs can be laid individually, but the vast majority
are laid in masses, which are then covered with a soft, chalky-white material
for preservation.
The eggs have the ability to lay dormant in the winter as larvae,
while pupating in the soil. Come spring, the pupae will rise
to the surface of the soil just before the adult emerges,
which leaves the pupal skin sticking out of the soil haphazardly (Mahr S. 2009).
Picture of a female Promachus
vertebratus prior to copulation, taken from
WisconsinButterflies.org
In the end, the typical life cycle of Promachus
vertebratus includes egg-larva-pupa-adult. The adult can be
easily recognized by its distinct buzzing sound and predatory
flying style.
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