Genus Thanaos Boisduval (the Dusky-wings)
(1) Thanaos brizo Boisduval & Leconte, Plate CXXXV, Fig. 1, ♀ (The Sleepy Dusky-wing).
The two rows of light yellow spots on the outer margin of the hind wings appear more distinctly on the under side. Expanse 1.25-1.60 inch.
Larva feeds on oaks and other plants. Ranges from the Atlantic to the Pacific, from New England to Florida and Arizona.
(2) Thanaos icelus Lintner, Plate CXXXV, Fig. 2, ♂ (The Dreamy Dusky-wing).
Under side paler than upper, marked with many small, indistinct yellow spots, not forming well-defined bands as in preceding species. Expanse 1.00-1.20 inch.
Caterpillar feeds on aspen, oaks, and witch-hazel. Ranges from Nova Scotia to Oregon, south to Florida and Arizona.
(3) Thanaos lucilius Lintner, Plate CXXXV, Fig. 3, ♂ (Lucilius’ Dusky-wing).
Closely related to preceding, but distinguished by more regularly checkered fringes of the fore wing and the different arrangement of the spots on the under side. Expanse 1.20-1.40 inch.
Larva feeds on columbine (Aquilegia). Ranges from New England to Georgia, and westward through the valley of the Mississippi.
(4) Thanaos juvenalis (Fabricius), Plate CXXXVI, Fig. 1, ♀ (Juvenal’s Dusky-wing).
A large species with translucent spots arranged as an interrupted band beyond middle of wing. Expanse 1.35-1.60 inch.
Ranges from Quebec to Florida and westward to Arizona.
(5) Thanaos petronius Lintner, Plate CXXXVI, Fig. 2, ♂ (Petronius’ Dusky-wing).
Somewhat resembling the preceding, but translucent spots much fewer in number and upper side much darker. Under side uniformly dusky with few light spots. Expanse 1.50-1.75 inch.
Confined to Florida so far as known.
(6) Thanaos martialis Scudder, Plate CXXXVII, Fig. 1, ♂ (Martial’s Dusky-wing).
Upper side paler than in most species, with a purplish gray cast, all light spots of upper side repeated more distinctly on under side. Expanse 1.25-1.40 inch.
Ranges from Massachusetts to Georgia, westward to Missouri and New Mexico.
(7) Thanaos horatius Scudder, Plate CXXXVII, Fig. 2, ♂ (Horace’s Dusky-wing).
Smaller than T. juvenalis, which it resembles; paler above on both wings, below more profusely mottled on hind wings. Expanse 1.65 inch.
Ranges from Massachusetts to Texas.
(8) Thanaos funeralis Lintner, Plate CXXXVII, Fig. 3, ♂ (The Funereal Dusky-wing).
Hind wings very dark, partly fringed with pure white. Expanse 1.35 inch.
Found from western Texas to Mexico.