1921] NATURAL SCIENCES OF PHILADELPHIA. 13 



fascia across the middle of the brown; fascia margined outwardly 

 along the middle of its length with silvery scales; a basal streak of 

 silvery scales just within the costal margin. Outer half of wing 

 white, except a narrow band around apex and along termen, which 

 is ochreous, dusted with white and fuscous. White patch with two 

 longitudinal black and one or two fuscous lines of scales; the two 

 black lines ending at the outer border of the white patch in con- 

 fluent black spots, nearly overlaid with silvery scales; a wedge- 

 shaped black spot beneath these, silvery margined, and a large 

 quadrate black patch just above fold, with two transverse hries of 

 silvery scales and a few silvery scales at its upper outer ajigle. Cilia 

 white with a pale fuscous line through the middle. White marks 

 more or less distinctly repeated on the underside. Hind wings 

 more pointed than usual, brownish fuscous, underside with a whitish 

 irregular submarginal patch; ground color shading darkest next to 

 this patch. Underside of thorax white, abdomen fuscous. Legs 

 whitish, tibiae and tarsi brownish. Expanse, 11.5-12 mm. 



Type (cf ), and one paratype ( 9 ), Glacier Park Station, July 14. 



Very close to extrincicella Dyar, from which it differs by the pure 

 white of the fore wings, the whitish irregular patch on the under- 

 side of the hind wings, and the narrower wings, particularly the 

 narrower more pointed hind wings. 



Choreutis caliginosa n. sp. 



Palpi fuscous and white intermixed; antennae dark brown, with 

 white annulations. Head and thorax dark broAvnish gray, a few 

 scales at the posterior margin of the head and a very narrow line 

 along the inner edge of the patagia whitish. Fore wings dark brown ; 

 a curved whitish fascia at basal fourth, palest and broadest on the 

 dorsum and not reaching the costa; a basal streak of iridescent 

 scales just within the costa; outer half of the wing, except the apical 

 part, occupied by a paler patch of whitish-tipped brown scales, 

 marked at the inner and outer edge on the costa by a white spot, 

 below which are a few iridescent scales; before the pale patch on the 

 dark brown ground color in the middle of the wing is a black spot, 

 nearly overlaid with iridescent scales. On the pale patch, above the 

 middle, a small black spot with iridescent scales, three or four longi- 

 tudinal black lines running out into the ground color in the apex; 

 below, a large quadrate patch, sometimes divided transversely, 

 containing two transverse patches of iridescent scales. A few iri- 

 descent scales along termen below apex. Hind wings dark brown, 

 on underside an irregular paler submarginal band. Expanse, 10.5- 

 11 mm. 



Type (cf), paratype (9), Two Medicine Lake, July 16; in dry 

 meadows. 



Close to occidentella Dyar, but smaller and darker, and with the 

 oblique iridescent streak beyond the basal fascia in that species 

 replaced by a black spot overlaid with iridescent scales. 



