_Butterfly._--Dark brown, glossed at the base of the wings and on the inner margin of the secondaries with blue. The under side is well delineated in the plate. Expanse, 1.00 inch. _Early Stages._--These await description. _Cecrops_ is common in the Southern States, and has been taken as far north as West Virginia, Kentucky, and southern Indiana. (26) =Thecla clytie=, Edwards, Plate XXX, Fig. 6, ♀ (Clytie). _Butterfly._--Blue above, with the apical two thirds of the fore wings black. The wings on the under side are white, with the usual marginal and transverse markings quite small and faint. Expanse, .90 inch. _Early Stages._--Unknown. Habitat, Texas and Arizona. (27) =Thecla ines=, Edwards, Plate XXIX, Fig. 35, ♂ (Ines). _Butterfly._--Much like the preceding species, but smaller, with the secondaries marked with blackish on the costa. On the under side the wings are slaty-gray, with numerous fine lines and a broad median dark shade on the hind wings, running from the costa to the middle of the wing. Expanse, .75 inch. _Early Stages._--Unknown. _Ines_ is found in Arizona. (28) =Thecla behri=, Edwards, Plate XXX, Fig. 4, ♂; Fig. 5, ♂, _under side_ (Behr's Hair-streak). _Butterfly._--Both sides are well displayed in the plate, and therefore need no particular description. Expanse, 1.10 inch. _Early Stages._--Unknown. This species is found in northern California and Oregon, and eastward to Colorado. (29) =Thecla augustus=, Kirby, Plate XXX, Fig. 15, ♀ (The Brown Elfin). _Butterfly._--Brown on the upper side; paler on the under side. The fore wings are marked by a straight incomplete median band, and the hind wings by an irregularly curved median band or line. Back of these lines toward the base both wings are darker brown. Expanse, .90 inch. _Early Stages._--These are not well known. Henry Edwards describes the caterpillar as "carmine-red, covered with very short hair, each segment involute above, with deep double foveæ." The chrysalis is described by the same observer as being "pitchy-brown, covered with very short bristly hair, the wing-cases paler." The food-plant is unknown. This species is boreal in its haunts, and is found in New England and northward and westward into the British possessions. (30) =Thecla irus=, Godart, Plate XXX, Fig. 12, ♂; Plate V, Figs. 32-34, _chrysalis_ (The Hoary Elfin). _Butterfly._--Grayish-brown on the upper side. The wings on the under side are of the same color, paler on the outer margins, and darker toward the base. The species is subject to considerable variation. The variety _arsace_, Boisduval, has the hind wings marked with reddish near the anal angle, and the outer margin below marked with hoary-purple. The usual small crescentic spots appear on the outer margin of the hind wings, or they may be absent. Expanse, 1.10 inch.