SEMASIA. 59 



indistinct dusky grey line runs along the apical margin, more or less conjointly with another 

 at the base of the stone-grey cilia. Hind wings with vein 3 forked near the margin in female, 

 and in one wing only of the male ; rather shining whitish grey in the female, more greyish in 

 the male, slightly emarginate below the apex, especially in the male, with a slender redupli- 

 cated darker line along the base of the cilia. 1 (3^, 2 ? . Expanse of wings 15 millims. 

 September 22nd, 1871, Crooked Eiver, near Klamath Lake, Southern Oregon. 



The difference in vein 3 of the two hind wings of the male above described led me to 

 re-examine it very carefully ; for had it been a female or an hermaphrodite I should have been 

 disposed to consider this species and the following as only opposite sexes of the same ; but 

 the specimen is in all respects a true male, the frenulum on both sides being single ; and it 

 differs as decidedly as the female from Semasia sublapidana. . 



Semasia suWapidana. (Plate LXXIII. fig. 9.) 



Palpi hirsute, projecting about the length of the head beyond it, roughly clothed with 

 long hair-like scales, mixed greyish white and fuscous ; the head and base of antennse roughly 

 clothed and tufted with scales of the same colour : antennse in the male strongly pubescent or 

 ciliated. Fore wings — fully three times as long as wide, the costa almost straight ; apex 

 rounded ; apical margin very oblique, the anal angle rather less defined than in the preceding 

 species, giving the wing a more lanceolate appearance — ^yellowish stone-colour, densely irro- 

 rated with whitish and greyish-fuscous scales ; an indistinct dusky grey line runs along the 

 base of the stone-grey cilia ; a line of the same colour along the apical margin is broken into 

 a continued series of indistinct spots : the yellowish-grey ground-coloiir of the wing is more 

 visible towards the apical margin than in the preceding species. The hind wings very pale 

 whitish grey ; a slender reduplicated greyish line along the base of the cilia ; vein 4 obsolete, 

 i. e. vein-3 not forked. 4 ^ . Expanse of wings 16 millims. 



End of September 1871, near Klamath Lakes, Southern Oregon. 



This species in general appearance is singularly like the preceding one, S. lapidana ; and 

 being from the same locality, I long failed to distinguish them, considering them as only dif- 

 ferent sexes of the same species. The present species is slightly more slender than S. lapidana, 

 and can be at once recognized by the lanceolate appearance of the fore wings, the hirsute 

 palpi, and the very strongly pubescent antennse of the male. 



Semasia tenuiana. (Plate LXXIII. fig. 10.) 



Palpi greyish white, twice the length of the head, very thickly clothed with long hairs 

 projecting beyond the apical joint; antennae stouter and sbghtly pubescent in the male; head 

 and thorax greyish white. Fore wings — more than three times as long as wide, the costa 

 slightly arched ; apical margin very oblique — whitish, with a slight ochreous tinge, streaked 

 and irrorated with cinereous ; several small oblique cinereous streaks from the costa, the most 



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