NOETH AMEKICAN EUCOSMINAE. 175 



Type localities. — St. Martin's Falls, Albany River, Hudson Bay 

 {improhana and diffinana) ; Virginia {cressoniana) ; Albany, New 

 York (apriliana). 



Food plant. — Oak. 



2. EXENTERA IMPROBANA OREGONANA (Walsingham). 



(Pig. 309.) 



Semasia ? oregonana Walsingham, Illus. Lepid. Heter. Brit. Mus., vol. 4, 



1879, p. 62. 

 Proteopteryx oregonana Febnald, in Dyar List N. Amer. Lepid., no. 5211, 



1903. — Baknes and McDunnough, Cl^eck List Lepid. Bor. Amer., no. 



7114, 1917. 

 Exentera apriliana Kearfott, Can. Ent., vol. 37, 1905, p. 253 (in part). 



I am retaining Walsingham's name as a racial designation, though 

 in all probability oregonana is nothing but a color variety of im- 

 prohana. On the whole, however, the western specimens are rather 

 uniform. They differ from the eastern forms in that the contrasted 

 markings are almost obsolete and the fore wings to the naked eye at 

 least — practically unicolorous. An occasional specimen from Mani- 

 toba is as plainly marked as any eastern improhana while not a few 

 New York specimens of the latter grade into typical oregonana. 

 The differences in the food plants of our reared specimens and the 

 rather consistent uniformity of far western specimens suggest a 

 distinct race. Veins 7 and 8 of fore wings are either very short 

 stalked or connate in both forms. Most of the specimens from 

 Manitoba determined by Kearfott as apriliana Grote are referable to 

 oregonana. 



Male genitalia figured from specimen in National Collection from 

 Aweme, Manitoba (" N. Criddle, 30-III-1918, reared from aspen 

 poplar"). 



Distribution according to specimens in National Collection, 

 American Museum, and collection Barnes: Manitoba, Saskatchewan, 

 Athabasca, British Columbia. 



Alar expanse. — 19-21 mm. 



Type. — In British Columbia. 



Type locality. — "Camp Watson, on John Day's River" (near 

 Canyon City) , Oregon. 



Food plant. — Populus. 



3. EXENTERA SPOLIANA (Clemens). 

 (Fig. 310.) 

 Hedya spoUana Clemens, Proc. Ent. Soc. Pliila., vol. 3, 1864, p. 513. 

 Proteopteryx spoliana Feenald, in Dyar List N. Amer. Lepid., no. 5214, 1903. — 

 Baenes and McDunnough, Check List Lepid. Bor. Amer., no. 7121, 1917. 

 Eucosma Jiaracana Busck (not Kearfott), Proc. Ent, Soc. Wasli., vol. 16, 1914, 

 p. 150. 



