Lepidoptera The Pearl-bordered Fritillary Butterfly – Argynnis Euphrosyne
There is very little difference in the size of this and that of the last species, but Euphrosyne (Plate II, fig. 6) is generally a trifle larger. The two butterflies are also very similar in appearance; indeed, they are so much alike on the upper side that it is impossible to decide on the name of either without an examination of the under surface.
Euphrosyne has a border of seven triangular silver spots on each hind wing, exactly corresponding with those of Selene. It has also the large central spot of silver. But, beside these, there is only one other, and that is situated in the basal angle. Thus there are only nine silvery or pearly spots on each hind wing of Euphrosyne, while there are seventeen on Selene. This will form a ready means of distinguishing between the two species.
The seasons and localities of this butterfly correspond very closely with those of the last species, but it is much more common, and may be found in abundance in nearly all our southern woods during May and June.
The caterpillar, also, feeds on the same plant (dog violet) as Selene. It is black, with whitish lines along the sides; and is provided with a number of bristly spines.
The chrysalis is of a grey-brown colour, with small dots of a paler tint on the wing cases; and its body has a number of short conical projections exactly corresponding with the spines of the caterpillar.