The chrysalis is very similar to that of Edusa, green, with a yellow stripe.
In this country, the butterfly first appears in August; but on the Continent it seems to be double-brooded, being found in May as well as in August.
THE BLACK-VEINED OR HAWTHORN BUTTERFLY. (Aporia Cratægi.)
([Plate IV]. fig. 1.)
When on the wing, this species might easily be mistaken by the inexperienced for the common Cabbage
White; and, by virtue of this incognito, does in all probability often escape from the terrors of the net, which would speedily entrap him, were his real character known to the young hunter; for this butterfly is one of those called, in entomological slang, "a good thing"—a term expressive neither of superior excellence nor beauty, but meaning that the insect can't be met with everywhere, or every day, and when seen is always to be caught.
A closer view, however, shows it to be very distinct from all the other "Whites;" its decided black veinings on a milk-white ground, in conjunction with its large size, being sufficient for its immediate recognition.
The outline of the wings, as well as the play of the veining lines on their surface, is extremely elegant. It will be observed, that instead of the feathered fringe that surrounds the wings of most butterflies, they are bordered in this species by a stout nervure, forming a sharp black outline, and giving a peculiarly chaste finish.
The under side differs in no mentionable respect from the upper—a very rare circumstance in this tribe. From being very sparingly coated with scales, the wings are semi-transparent, differing much in this respect from those of the Garden White butterflies.