NORTH AMERICAN EUCOSMINAE. 21 



reforestation has been undertaken, and in such phices its origin can 

 be traced to trees introduced from eastern nurseries. At Halsey, 

 Nebraska, the infestation is especially severe, nearly every bud of 

 nearly every pine tree containing one or more larvae. 



Male genitalia figured from specimen in National Collection from 

 Fort Bayard, New Mexico (reared from P'mus ponderosa^ March 

 17, 1916, under Hopk. U. S. no. 13955, A. J. Jaenicke, collector). 



Distribution according to specimens in National Collection, Ameri- 

 can Museum, and collection Barnes : Arizona, New Mexico, Ne- 

 braska. 



Alar expanse. — 12-19 mm. 



Type. — In National Collection. 



Type locality. — Fort Bayard, New Mexico. 



Food plant. — Pinus pjonderosa and other species. 



10. KHYACIONIA SUBCEKVINANA (Walsingham) . 



Retinia suhcervinana Walsingham, Illus. Ivepid. Heter. Brit. Mus., vol. 4, 



1879, p. 25. 

 Eve<t7'ia suhcervinana Fernald, in Dj-ar List N. Amer. Lepid., no. 5004, 1903. — 



Barnes and McDunnough, Check List Lepid. Bor. Amer., no. 6763, 1917. 



This species is placed here only tentatively, as I have never seen 

 a specimen that could be assigned to Walsingham's name. The 

 distinguishing characters given in the key are taken from the 

 original description and figure. 



Alar expanse. — 14 mm. 



Type. — In British Museum. 



Type locality. — Rouge River, Oregon. 



Food plant. — Unknown. 



3. PETROVA, new genus. 



Getiotype. — Retinia comstockiana Fernald. 



Synonym. — Evetria Authors (not Hlibner) (part). 



Characters as in Rhycionia., except as follows: 



Fore wing with termen straight or verj^ slightly concave. 



Male genitalia with harpes battledore shaped ; cucullus very large ; 

 neck incurvation ^^ deep ; sacculus with clasper spur projecting into 

 incurvation of neck; costal hook present. Socii developed; finger 

 like ; very long, more than half the length of tegumen. Gnathos 

 free; weakly chitinized. Aedoeagus straight; short; stout; cornuti 

 a cluster of several elongate spines. Larva with four setae in group 

 VII on proleg-bearing abdominal segments. 



The larvae of this genus feed on various pines and spruces, boring 

 into bark or stems and forming a characteristic nodule of pitch 

 and frass over the part attacked. 



" Wrongly called " anal angle " by me in Proc. U. S. Nat. Mus., vol. 57, 1920, p. 92. 



