The first butterflies of this species are usually disclosed from the
chrysalis late in June or early in July. They continue to come forth
for several weeks, apparently until nearly the middle of August. They
lead a leisurely life, visiting freely the flowers of goldenrod,
iron-weed, boneset, Joe Pye weed, and especially swamp milkweed. They
are most likely to be found in lowlands and along the borders of
swamps where these favorite flowers are growing. It evidently requires
some time for the eggs to develop within the ovaries, for the
butterfly cannot begin laying these until the latter part of August.
They apparently are normally deposited on the under side of violet
leaves, although so far as I know no butterfly has been seen thus
laying her eggs. It would be an interesting point for some young
observer to determine. Even the eggs take a long time to develop, not
hatching for three or four weeks after they are laid. When they do
hatch the tiny caterpillars seem not to eat at all but to go directly
into hibernation.
These butterflies are to be found in their preferred habitats almost
any time during July, August, and September. Apparently many of them
live as adults for nearly three months so that whether we consider the
egg, the larva, the chrysalis, or the adult we have in this species an
unusual duration of life. This is doubtless an adaptation to the fact
that the species must get through the year with only one brood.
This unity of habit with no such variations as occur in many
butterflies with a wider range north and south is apparently
correlated with the distribution of this butterfly. It is found in a
belt of territory running from New England and the Atlantic states
westward at least to Nebraska along a line which approximates the
annual isotherm of fifty degrees Fahrenheit.
=The Great Spangled Fritillary=
_Argynnis cybele_
To one who wanders much in the woods and open fields there are few
summer scenes more characteristic of the season than that of a group
of milkweeds in full flower, surrounded by a host of brown butterflies
busily sucking the nectar from the curious pink blossoms. There are
likely to be several species of these winged creatures, but in many
regions of America the largest and most conspicuous will generally be
the Great Spangled Fritillary. This butterfly is easily recognized by
its large size and its combination of two colors of brown, with
whitish or silverish spots scattered over the lower surface of the
wings.
Public-domain text, read in full here on John Shaqi.
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