NORTH AMERICAN LASPEYRESIINAE AND OLETHREUTINAE 161 



which I have elsewhere in this paper (p. 141) restricted to the north- 

 ern form with blackish fuscous dusting on dorsal half of median 

 band. 



In unrubbed specimens the basal patch is darker in exaeresimum 

 than in tilianurti and more completely obliterated on costa by pale 

 scaling ; but in slightly rubber specimens these differences disappear. 

 The two, however, have such distinct genitalia that there is no con- 

 fusing them. Those of exaeresiTnum, have the general harpe shape 

 of Group B ; but the digitus is entirely lacking and there is a stout 

 hair brush from the base of th^ sacculus arch different from any- 

 thing else in the genus. 



48. EXARTEMA FERRIFERANUM (Walker) 



(Figs. 100, 220, 407) 



Sciaphilaf ferriferana Walker, Cat. Lepid. Brit. Mus., vol. 28, 1863, p. 343. 

 Sericoris gratiosana Clemens, Proc. Ent. Soe. Philadelphia, vol. 5, 1865, 



p. 134. 

 Grapholitha {Poecilochroma) usticana Zeller, Verh. Zool.-bot. Ges. Wien, 



vol. 25, 1875, p. 293. 

 Exartema ferriferanum Walsingham, Illus. Lepid. Heter. Brit. Mus., vol. 



4, 1879, p. 37.— Fernald, in Dyer List N. Amer. Lepid., no. 5027, 1903.— 



Barnes and McDunnough, Check List Lepid. Bor. Amer., no. 6811, 



1917. 

 . Cymolomia ferriferana Fobbes, Memoir 68, Cornell Univ. Agr. Exp. Sta., 



1924, p. 469. 



A strikingly marked species easily distinguished on paattern and 

 genitalia from all other Exartema. 



Male and female genitalia figured from reared specimens in Na- 

 tional Collection from Bluemont, Virginia (H. B, Kirk, 1-June- 

 1914). 



Distribution. — District of Columbia, Virginia, North Carolina, 

 Pennsylvania. 



Alar expanse. — 16-18 mm. 



Types. — In British Museum {ferriferanum) ; In Academy of Natu- 

 ral Sciences, Philadelphia {gratiosana) ; location unknown {usti- 

 cann). 



Type localities. — " North America " {ferriferanum and usticana) ; 

 Virginia {gratioso/na) . 



Food plant. — Hydrangea. 



17. Genus HEDIA Hubner 



(Fig. 62) 

 Hedia Hxjbner, Verz. Schmet., 1826, p. 380. {Penthina Treitschke). 

 Genotype. — Phalaena Tinea salicella Linnaeus (Europe). 

 Characters as in Olethreutes except : 



Male genitalia with cucuUus usually more than half the length 

 of harpe ; uncus rather well spined inwardly at apex ; comuti absent 



