376 PROCEEDINGS OF THE NATIONAL MUSEUM vol.86 



Male genitalia with apical process of gnathos bifid; harpe with 

 apex evenly rounded; vinculum broad and short; anellus with base 

 of plate broadly and strongly sclerotized, arms short, broad, not 

 twisted or bent and with apices pointed ; aedeagus moderately long, 

 rather slender, sclerotized throughout and with a minutely scobinate 

 flange at apex. 



Female genitalia without signum ; bursa copulatrix smooth or with 

 a few scattered microscopic scobinations ; ductus bursae short, sco- 

 binate at genital opening ; ductus seminalis from ductus bursae. 



Larva white with dark spots forming incomplete cross bands ; two 

 setae in group VII on abdominal segments 7 and 8. 



The larvae are solitary or semigregarious feeders in Echinocereus. 

 The larva of only one species (leuconips) is known but the characters 

 here given presumably apply to the genus. 



Eggs laid singly. 



Remarks. — This genus is close to Tiwuniania and has many charac- 

 ters in common with Olyca. The latter, however, has veins 3 and 5 

 of the hind wing connate, the ductus seminalis from the bursa rather 

 than from the ductus bursae, the male labial palpus oblique, the 

 aedeagus stout, and the basal plate of the anellus narrowly sclerotized. 

 The characters separating Eremherga from Tucumania have been disr 

 cussed in connection with the latter genus. 



Three species are here recognized as belonging to Eremherga. 



Its distribution is the southwestern part of the United States and 

 Mexico. 



KEY TO THE SPECIES OF EREMHERGA 



1. A conspicuous, blackish, discal spot on fore wing at end of cell. 



3. insignis, new species 

 No such discal spot on fore wing 2 



2. General color of fore wing pale slate-gray 1. leuconips (Dyar) 



Predominant colors of fore wing white and luteous 2. creabatea (Dyar) 



1. EREMBERGA LEUCONIPS (Dyar) 



Plates 29, 39, 49 ; Figures 22-22c, 55-55a, ll&-118a, 119-119a 



Cactobrosis leuconips Dyab, Insecutor Inscitiae Meustruus, vol. 13, p. 224, 3925; 

 Proc. Ent. Soc. Washington, vol. 30, p. 136, 1928. 



Male. — Palpi, head, thorax, and fore wings grayish fuscous densely 

 sprinkled with white, giving the insect a pale slate color. Labial 

 palpus banded with blackish fuscous toward the ends of the segments. 

 Fore wing with veins 3 to 10 outlined in black, the black scaling es- 

 pecially strong on lower vein of cell; antemedial and subterminal 

 lines very fine and faint but usually discernible, black; antemedial 

 line acutely angulate and irregularly sinuate and dentate, more or less 

 broken and normally obliterated at costa; subterminal line also ir- 



