AMERICAN LEPIDOPTERA. 37 



whereas it is oblique in all my specimens, corresponding thus rather 

 with oregonella. Wish. ; however, I have no doubt of their identity. 

 Mr. A. Busck,* not having seen this species, refers it to Kudarcia 

 and identical with T. ccemitariella Ch. ; this is erroneous. I have 

 seen the type of the latter species in the Cambridge Museum, and 

 there is not even a remote resemblance between the two forms. 



GROUP II. 



The species constituting this group are quite dissimilar in habitus 

 from those of the first; abdomen and antennae more slender. 

 Four species belong here, which may be thus separated : 



Forewings white, with dark brown markings. 



In large spots piperella. 



In faseias rlieumapterella. 



Forewings without markings. 



Unicolorous, golden bronze. a?iieseeus. 



Nearly unicolorous, creamy white politella. 



I. piperella Busck.— Proc. U. S. Nat. Mus., Vol. XXVII, p. 775.— So 

 closely does this species resemble Greya punctiferella Wish., that aside from 

 generic differences, its recognition would be quite difficult. It is, however, a 

 larger insect and has scarcely any of the pale yellowish color of the forewings. 



Exp. 21.0 mm. 



Hab. — Washington Territory (Pullman); Colorado (S. Park). 

 A mutilated specimen in my collection. 



I. rlieumapterella n. sp. — PI. I, fig. 4. — Head hoary, scales somewhat ap- 

 pressed. Labial palpi ascending, grayish white, dusted with fuscous externally. 

 Tongue strongly developed. Antennae slender, and one-half the length of fore- 

 wings, yellowish white from the base passing into deep brown beyond the middle. 

 Thorax deep brown, with a white stripe each side of median line, widest anteriorly. 

 Forewings elongate-oval, white, marked with dark brown as follows: base, a 

 large semi-oval costal spot, a curved fascia beginning at one-third of costa, con- 

 cave towards the base and attains the dorsal margins at one-half the distance 

 from the base than the costal extremity, a transverse, slightly curved fascia at 

 the middle, a Y-shaped, confluent fascia beyond the middle and connecting at 

 the dorsal margin with the wide apical border. Cilia grayish fuscous, becoming 

 whitish apically; underside shows dark markings of upper side but more dif- 

 fusely towards the apex. Hind wings white, with a faint grayish tinge and rather 

 thickly dusted with fuscous on costal half of apex. Cilia white under 1, under- 

 side with fuscous scales along costal margin and about apex. Abdomen dark fus- 

 cous brown above. Thorax beneath brown, overlaid with silvery white scales, 

 underside of abdomen yellowish brown. Legs grayish white, tarsi tinged with 

 yellowish. 



Exp. 11.0 mm.; 0.44 inch. 



* Proc. Ent. Soc. Wash., Vol. V, p. 193. 



TBANS. AM. ENT. SOC. XXXI- JANUARY, 1905. 



