140 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 90 



around termen and sparse irrorations over entire surface of fore wing 

 fuscous to blackish fuscous. Legs and abdomen white, the former 

 strongly suffused with fuscous. 



Male genitalia. — Harpe ample, gently tapering toward cucullus, the 

 latter rounded. Sacculus strongly sclerotized; both arms of clasper 

 very slender, sharply pointed, the transverse arm arising well before 

 middle of harpe and reaching two-thirds distance toward costa. Anel- 

 lus a weakly sclerotized broad plate with well developed, slightly hairy, 

 lateral lobes. Transtilla a weakly sclerotized band with well developed 

 lateral lobes. Aedeagus slender, slightly curved, not appreciably com- 

 pressed, bluntly pointed with elongate, spinulate patch on vesica. Vin- 

 culum rounded. Gnathos an oval spined knob. Socii weakly sclero- 

 tized, sparsely hairy, fleshy lobes. 



Female genitalia. — Ostium small, round, without strongly sclero- 

 tized area laterally. Ductus bursae membranous, slender, inception of 

 ductus seminalis on right side just before ostium. Bursa copula trix 

 large, pear-shaped, with strongly sclerotized oval signum. 



Alar expanse, 21-23 imii. 



Type. — In collection of Dr. A. F. Braun, Cincinnati, Ohio. 



Type locality. — Two Medicine Lake, Glacier National Park, Mont. 



Food plant. — Unknown. 



Distribution. — ^Western United States and Canada in Mountains. 



United States records 



"Washington: Skyline Ridge, Mount Baker district, Wliatcom County, alt. 6,000 

 feet, 5,399 (26-VII-25 and 16-VIII-30, J. F, G. Clarke). 



Wyoming: Green River Lake, Wind River Range, 12 5 5 , 9 (July 24 to August 

 7, 1935, A. B. Klots). 



Canadian records 



Alberta: Lake Louise, $ ("VIII-1918"). 



Remarks. — ^This is one of three known white species in this genus 

 from North America. The others, canella and sordidella (new spe- 

 cies) , cannot be confused with it. 



Dr. Braun has compared a male with her type and has kindly 

 verified my determination of the species. 



The venation is subject to considerable variation, one female having, 

 on the right side, an accessory cell in the fore wing between veins 9 

 and 11 that is included in the discal cell ; vein 7 of the hind wing is 

 forked. 



MARTYRHILDA HILDAELLA, new species 



Plate 24, Fioxtkes 148, 148a 



Labial palpus sordid whitish ; second segment with sparse black and 

 fuscous irrorations exteriorly, mostly confined to basal half, and with 

 slight infuscation in the undivided slender brush; third segment im- 



