_Early Stages._--For a knowledge of what is known of these the reader may consult the pages of Scudder and Edwards. The caterpillar feeds upon willows. It is found all over the Northern States, ranging from Quebec to Vancouver's Island. It seems to be very common on Mount Hood, from which I have a large series of specimens. (12) =Thecla itys=, Edwards, Plate XXIX, Fig. 17, ♀ (Itys). _Butterfly._--The only specimen of this species known to me is figured in the plate. It is the type. Of its early stages nothing is known. It was taken in Arizona. Expanse, 1.25 inch. (13) =Thecla edwardsi=, Plate XXIX, Fig. 27, ♀ _under side_; Plate V, Fig. 29, _chrysalis_ (Edwards' Hair-streak). _Butterfly._--Dark plumbeous-brown on the upper side, with a pale sex-mark on the fore wing of the male. On the under side the wings are paler and a trifle warmer brown, with their outer halves marked with numerous fine white broken lines arranged in pairs, with the space between them darker than the ground-color of the wing. The usual black spots, green scales, and red crescents are found near the anal angle on the under side. _Early Stages._--For all that is known of these the reader will do well to consult the pages of Scudder. The caterpillar feeds on oaks. The species ranges from Quebec westward to Colorado and Nebraska, being found commonly in New England. (14) =Thecla calanus=, Hübner, Plate XXIX, Fig. 26, ♀; Plate V, Figs. 25, 27, _chrysalis_ (The Banded Hair-streak). _Butterfly._--On the upper side resembling the preceding species very closely, but a trifle darker, and warmer brown. On the under side the wings are marked by fine white lines on the outer half, which are not broken, as in _edwardsi_, but form continuous bands. Expanse, 1.15 inch. _Early Stages._--The caterpillar feeds on oaks. The life-history is described with minute exactness by Scudder in "The Butterflies of New England," vol. ii, p. 888. This insect has a wide range, being found from the province of Quebec to Texas and Colorado. It is common in western Pennsylvania. (15) =Thecla liparops=, Boisduval and Leconte, Plate XXIX, Fig. 28, ♀, _under side_; Plate V, Fig. 28, _chrysalis_ (The Striped Hair-streak). _Butterfly._--Dark brown on the upper side, grayish below. The lines are arranged much as in _T. edwardsi_, but are farther apart, often very narrow, scarcely defining the dark bands between them. The spots at the anal angle are obscure and blackish. Expanse, 1.15 inch. _Early Stages._--Much like those of the allied species. Scudder, in "The Butterflies of New England," gives a full account of them. The caterpillar feeds on a variety of plants--oaks, willows, the wild plum, and other rosaceous plants, as well as on the _Ericaceæ_. It ranges through the northern Atlantic States and Quebec to Colorado and Montana, but is local in its habits, and nowhere common. (16) =Thecla chalcis=, Behr, Plate XXIX, Fig. 36, ♂; Fig. 37, ♀, _under side_ (The Bronzed Hair-streak).