On the river Hypanis in the Cimmerian Bosphorus, about the
time of the summer solstice, there are brought down towards the sea by
the stream what look like little sacks rather bigger than grapes,
out of which at their bursting issues a winged quadruped. The insect
lives and flies about until the evening, but as the sun goes down it
pines away, and dies at sunset having lived just one day, from which
circumstance it is called the ephemeron.

As a rule, insects that come from caterpillars and grubs are
held at first by filaments resembling the threads of a spider's web.

Such is the mode of generation of the insects above
enumerated. but if the latter impregnation takes placeduring the
change of the yellow