. Bulletin. Natural history; Natural history -- Montana. BUTTERFLIES OF MONTANA. 149 Genus THANAOS, Boisduval. Butterfly—Antennae have a moderately large club, curved, bluntly pointed. The palpi are porrect, the third joint almost concealed in the hair of second. All dark in color. PERSIUS' DUSKY-WING, Thanaos persius, Fig. 108. Thanaos persius, from Helena. Fig. 109. Thanaos persius. Butterfly—Expanse, to Inches, 30 to 35 mm. Upper surface dark brown with a row of small white spots before the apex of the fore- wings, and a single one posterior to these. On the fore wings the
. Bulletin. Natural history; Natural history -- Montana. BUTTERFLIES OF MONTANA. 149 Genus THANAOS, Boisduval. Butterfly—Antennae have a moderately large club, curved, bluntly pointed. The palpi are porrect, the third joint almost concealed in the hair of second. All dark in color. PERSIUS' DUSKY-WING, Thanaos persius, Fig. 108. Thanaos persius, from Helena. Fig. 109. Thanaos persius. Butterfly—Expanse, to Inches, 30 to 35 mm. Upper surface dark brown with a row of small white spots before the apex of the fore- wings, and a single one posterior to these. On the fore wings there is a (i-ansverse pale band just beyond the middle of the wings, but this band is not as well defined as in T. lucilius, which is found in the eastern part of the United States. Hind wings more of a reddish brown than the fore wings, with two rows of indistinct ochraceous spots near the outer margin, and a spot at the end of the cell in typical specimens. Underside of the females grayish brown, the apical portion of the fore wings gray; the white hyaline spots are repeated, and both wings have two marginal rows of whitish spots. The males are darker than the females. The species is subject to great variation, some specimens being light and others dark in color. Holland says "There is scarcely any positive clue to the specific identity of the insect except that which is derived from the study of the genital armature of the male, which is a micr- scopic research capable of being performed only by an expert in such ; Early Stages—The caterpillar feeds on willow and poplar. Distribution—From New England across to the Pacific, southward as well. In the state it has been taken by Elrod at Missoula and in the Mis- sion Mountains; by Douglas and Smith at New Chicago; by Cooley at Bozeman, by Brandegee at Helena, and by Coubeaux at Big Please note that these images are extracted from scanned page images that may have been digitally enhanced for readab
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