_Chrysalis._--The chrysalids have the head more or less bifid. There is a prominent thoracic tubercle, and a double row of dorsal tubercles on the abdomen. Viewed from the back they are more or less excavated on the sides of the thorax. In color they are generally some shade of wood-brown or greenish. The caterpillars feed for the most part upon the _Urticaceæ_, plants of the nettle tribe, such as the stinging-nettle, the elm, and the hop-vine, though the azalea and wild currants furnish the food of some species. The genus is confined mainly to the north temperate zone. (1) =Grapta interrogationis=, Fabricius, Plate I, Fig. 3, ♂, _under side_; form =fabricii=, Edwards, Plate XIX, Fig. 1, ♂; form umbrosa, Lintner, Plate XIX, Fig. 2, ♀; Plate III, Fig. 23, _larva_, from a blown specimen; Fig. 27, _larva_, copied from a drawing by Abbot; Plate IV, Figs. 21, 22, 24-26, 40, _chrysalis_ (The Question-sign). _Butterfly._--Easily distinguished by its large size, being the largest species of the genus in our fauna. The fore wings are decidedly falcate, or sickle-shaped, bright fulvous on the upper side, spotted and bordered with dark brown and edged with pale blue. On the under side they are mottled brown, shaded with pale purplish, and have a silvery mark shaped like a semicolon on the hind wings. The dimorphic variety _umbrosa_, Lintner, has the upper side of the hind wings almost entirely black, except at the base. Expanse, 2.50 inches. _Early Stages._--These have been frequently described, and the reader who wishes to know all about the minute details of the life-history will do well to consult the pages of Edwards and Scudder, who have written voluminously upon the subject. The food-plants are the elm, the hop-vine, and various species of nettles.