SEMASIA. 
57 
than its length beyond it : antennae with the basal joint thickened. Fore wings milk-white; 
the cilia bright chestnut-brown, with an inconspicuous oblique pale olive-grey fascia from 
near the base to the middle of the dorsal margin; another of the same colour from the 
middle of the costa, joining a bright chestnut-brown streak which divides the subobsolcte 
ocellated spot above the anal angle ; this streak contains two or three black scales and some 
few sublustrous silvery- white ones : underside glossy pale chestnut, the costa narrowly white. 
The hind wings pale grej^, faintly shaded with chestnut, especially along the margins ; vein 4 
of the hind wings is absent. Type . Expanse of wings 2.2 millims. 
A single larva, found July 29th, 1871, near Moimt Shasta, California, drawing together 
the leaves of leading shoots of a species of Artemisia, produced a male in the following month. 
The species is allied to the European S. 2jupillana, L. 
Semasia scalana. (Plate LXXIII. fig. 4.) 
Head cinereous grey ; palpi cinereous grey above, white at the base beneath, thickly 
clothed, extending nearly twice the length of the head beyond it : antennaj fuscous above, 
paler beneath. Fore wings — oblong, three times as long as wide, the costa arched towards 
the base; apical margin oblique, not perceptibly indented — reddish chocolate-brown; a few 
scattered whitish scales at the base ; an oblique white, rather shining fascia from before the 
middle of the costa to beyond the middle of the dorsal margin, divided by a narrow pale yel- 
lowish-buff line ; some shining silvery streaks from the costa beyond the middle, divided by 
pale yellowish fawn-colour, and extending to the ocellated spot, which is irrorated with 
fuscous in its upper half, and contains in its lower half a patch of twelve (sometimes 
sixteen) square black dots, divided into two groups of six or eight each by a lustrous steel- 
blue streak, and margined on both sides by lustrous steel-blue : cilia whitish, irrorated 
■with fuscous. Ilind wings brownish grey ; vein 4 absent. 4 . Expanse of wings 
16 millims. 
June 1872, on the borders of California and Oregon. 
Semasia columbiana. (Plate LXXIII. fig. 5.) 
Head, thorax, and palpi speckled grey, the latter paler beneath, projecting about the 
length of the head beyond it : antennae simple. Fore wings wdiitish, thickly irrorated witli 
greyish fuscous ; in the male three times as long as wide ; costa very slightly bulged near the 
base ; apical margin scarcely sinuated; dorsal margin convex towards the base ; a basal patch, 
occupying the first third of the wing, sometimes greyish fuscous, sometimes buft'-brown, and 
sometimes pale brownish bulF, margined with fuscous ; an oblique fascia of a corresponding 
colour, sinuated on its inner edge, near the dorsal margni, sometimes witli a branch towai'ds 
the costa before the apex ; a few sublustrous whitish streaks in the apical portion of the wing, 
I 
