WM. G. DIETZ, M.D. 29 



Very distinct and easily distinguished from the other species 

 of this group, having the deep excision and long cilia of the 

 male an'ennae. 



4. H. gigantella Ch. — Head, thorax, and palpi white, more or 

 less dusted and finely speckled with fuscous. Antennae grayish-fuscous 

 above, brownish beneath, basal joint and pecten white, speckled with 

 fuscous ; in the male deeply excised above the basal joint with trun- 

 cated scale tuft, cilia a trifle over 1. Palpi slender, ascending, not re- 

 curved, about equal in the sexes, terminal joint about three-fourths the 

 length of the second, speckled, especially externally, with dark fuscous 

 scales. Forewings elongate, equally narrowed from apical fourth, 

 ground color white, more or less dusted and speckled with fuscous, 

 veins and a line in the fold, dark fuscous; cilia gray, sprinkled with 

 white, intermixed with fuscous scales around the apex. Hindwings 

 over 1, yellowish-gray, dusted with fuscous, veins darker ; cilia under 

 1, yellowish-white with an indistinct, subbasal dark line. Underside 

 of forewings fuscous, darker towards the costa ; hindwings grayish 

 fuscous. Abdomen above and underside of body, whitish, segments 

 above with a line of brownish scales before the posterior margin. 

 Legs white, strongly suffused with blackish externally, leaving the 

 ends of tibiae and tarsal joints white ; hind tibae strongly rough haired, 

 hairs white. Expansion 30.0 mm., 1.2 inch. 



Hab. — Colo., Cala. (San Luis Obispo). 



Five specimens, two males and three females, in my collec- 

 tion, four of these are from the last-named locality, and have 

 the ground color of the forewings more suffused with fus- 

 cous. Chambers supposed this species to feed upon yucca. 

 Not easily confounded with any other species of this genus. 

 The dark fuscous lines of the forewing, corresponding with 

 the neuration, give it a very distinct appearance, which is 

 approached only by the following species {nigristriata) , the 

 latter, however, is much smaller and lacks the dark lines in 

 the apical part of the wing. 



5. H. nigristriata Wish. 



The author describes this specimen as follows : 

 " Antennae yellowish ; basal joint considerably widened, with strong 

 pecten, dirty whitish. Palpi white, sprinkled with blackish scales, 

 very densely on the outer side. Head and thorax white, sprinkled 

 with blackish scales. Forewings white, much sprinkled and striated 

 with blackish scales ; an elongate patch of these scales extends from 

 the base along the fold to about one-sixth, and is diffused downward 



TRANS. AM. ENT. SOC, XXXVI. FEBRUARY, 1910. 



