514 Lord Walsingham on 



Type. $ . Mus. Wlsm. 



Hob. Arizona (Morrison, 1883), Colorado Larima Co., 

 5,000 ft., June, July, and August, 1891 (Smith). 



In some specimens there is more sprinkling of grey 

 scales over the white ground-colour than in others, 

 tending always to assume the form of diffused longitu- 

 dinal streaks, the ochreous subapical patch is sometimes 

 diffused downwards giving a slight ochreous shade 

 beneath it. 



Since writing the above description from the Arizona 

 specimens I have seen others from Colorado (collected 

 by Smith) which have a slight ochreous hue over the 

 forewings and a ferruginous brown dash near the base, 

 below and parallel to the fold, the dark marginal dots are 

 more distinctly expressed as is also the darkening of the 

 cilia. 



Allied to Semasia elongana, Wlsm., but lacking the 

 dorsal streak and the white dividing line in the cilia of 

 the forewings, it is also lighter in colour. 



Semasia transversa, sp. n. (PI. XII., fig. 16.) 

 Antennae, cinereous. Palpi triangular, projecting more than 

 twice the length of the head beyond it, the apical joint completely 

 concealed in long projecting scales ; pale cinereous, whitish above. 

 Head creamy-white. Thorax pale olive-brown. Forewings pale 

 olive-brownish, with white transverse fascia and outer patches 

 (I take the darker shade as the ground-colour for convenience of 

 description, but it would perhaps be equally correct to describe the 

 wing as white, with olive-brown basal patch and central fascia) ; 

 the white fascia commences before the middle of the costal margin, 

 is contracted at the upper edge of the cell, and dilated below the 

 cell to the dorsal margin, bulging on its outer edge along the fold ; 

 beyond the middle of the costa is an outwardly oblique white 

 patch, sometimes divided at its upper end by a small olivaceous 

 line or spot, this is contiguous at its outer edge to a waved white 

 band, enclosing a triangular spot of the dark ground-colour on the 

 costal margin, and extending nearly to the apex, on its lower por- 

 tion is an olivaceous shade ; beneath these two marks and some- 

 times touching the extremity of the first one the rounded ocelloid 

 patch, internally olivaceous, contains sometimes a few black scales, 

 but no black transverse streaks ; the margins of these three mark- 

 ings are narrowly shining white, and between and around them are 

 some dark umber-brown scales, a patch of the same lying on the 



