_White-M Hair-streak_ (_Eupsyche m-album_ or _Thecla m-album_). Wing expanse 1 1/3 inches. Upper wing surface blue with wide blackish margins in both sexes. Under surface marked with whitish lines suggesting the letter M, with a reddish spot near it. Each hind wing with two small tails. _Least Purple Hair-streak_ (_Calycopis cecrops_ or _Thecla cecrops_). Wing expanse 1 inch or less. Upper wing surface dark brown, more or less marked with blue, especially at base of front wings and inner half of hind wings. Under wing surface marked with a brilliant red line edged outside with white. Two very fine tails on hind wings with brightly colored spots near their base on lower surface. _Gray Hair-streak_ (_Uranotes melinus_ or _Thecla melinus_). Wing expanse 1 1/5 inches. Upper wing surface bluish gray with a brilliant red spot at base of tails on hind wing. Lower wing surface much lighter gray, each wing marked with a brown and white stripe and a row of dots nearer the margin. _Banded Hair-streak_ (_Thecla calanus_). Wing expanse 1 1/5 inches. Upper wing surface dull dark brown, commonly without markings although sometimes there is an orange spot on each hind wing. Lower wing surface a little lighter than upper with bright red and blue spots at the base of the tiny tails, and with distinct narrow blue and white broken bands extending across the outer half of each wing. _Striped Hair-streak_ (_Thecla liparops_). Wing expanse 1 inch. Very similar to the Banded Hair-streak, but having more white markings on the lower surface of the wings. _Acadian Hair-streak_ (_Thecla acadica_). Wing expanse 1 1/3 inches. Upper wing surface blackish brown with a slaty tinge, and red spots at base of the single short tail on each hind wing. Lower surface bluish gray with many small blackish spots edged with white arranged in two principal rows on the outer half of each wing. Larger orange-red spots on each side of base of the tail on each hind wing. _Olive Hair-streak_ (_Mitoura damon_ or _Thecla damon_). Wing expanse 1 inch or less. Upper wing surface olive-brown, more yellow in the male than the female. Tips of tiny tails on hind wing whitish. Lower surface green except where upper wing is covered by lower: this part is brown. The green is marked with a row of white spots on each front wing and two distinct rows of brown and white spots on each hind wing, with black spots between. THE TRIBE OF THE COPPERS The members of this tribe are well characterized by their name, for most of them show on the upper wing surface tones of coppery brown, more or less marked around the margin with darker shades. On the under side of the tarsi there are numerous spines in irregular clusters. In the chrysalis there are curious hair-like projections on the skin, which are short and shaped like tiny toadstools or mushrooms.