508 Lord Walsingham on 



distinctly dilated before the apex. Exp. Z., 28 mm. Hindwlngs 

 tawny brown ; cilia whitish, a brown dividing line near their base. 

 A bdomen whitish cinereous, anal tuft whitish ochreous. Legs whitish. 



Type. $. Mus. Wlsm. 



Hab. Colorado Loveland, 5 ; 000-10,000 ft., July, 

 1891 ; two specimens (Smith). 



In the second specimen, although both are in equally 

 good condition, the markings are almost obliterated, 

 neither the subcostal spots, the subapical line, nor the 

 discal lines being at all clearly defined but consisting 

 merely of a general distribution of brownish fuscous 

 scales indicating their pattern and position which so far 

 as it goes is the same as in the type. 



A series received (from the same locality) since this 

 description was written, exhibits considerable variation 

 in the markings, some varieties approaching closely the 

 narrower-winged Psedisca mediostriata, in these the 

 median shade and transverse streaking become obsolete, 

 the darker markings assuming the form of radiating 

 streaks between the veins beyond and above the cell. 

 In some specimens no markings whatever are apparent, 

 the ground-colour becoming pale cream ochreous with 

 merely some scattered fuscous scales dusted over the 

 surface. 



Pdsdisca mediostriata, sp. n. (PI. XII., fig. 11.) 

 Antennas biciliate (more than ) ; whitish. Palpi projecting 

 more than the length of the head beyond it ; fawn-grey, white on 

 their inner sides. Head and Thorax fawn-grey, the ends of the 

 tegulse paler. Forewings fawn-grey sprinkled with elongate 

 blackish scales, the costal margin from near the base white, a broad 

 median white streak from the base to the end of the cell is furcate 

 at its apex, a second narrower white streak running parallel with 

 it below the fold ; from the end of the cell about six diffused ill- 

 defined streaks radiate in the direction of the apex and apical 

 margin, interspersed with blackish scales; cilia white. Exp. at., 

 22 mm. Hindwlngs dark tawny brown ; cilia white with a distinct 

 brown line running through them near their base. On the under- 

 side the wings are all distinctly pale margined, the pale costal band 

 of the fore wings being of equal width throughout. Abdomen 

 creamy whitish. Legs whitish. 

 Type. $ . Mus. Wlsm. 



Hab. Colorado Loveland, 5,000 ft., July, 1891 ; five 

 specimens (Smith). 



