NORTH AMERICAN EUCOSMINAE. 23 



This and virginiana are our common nodule makers in the eastern 

 United States. They differ in habit chiefly in that conistockiana 

 bores only in stems of the same year's growth, while virginiana nor- 

 mally attacks the bark of older twigs and branches. The work can 

 be easily recognized by the large hard nodules of frass-stained pitch 

 found at the exit holes of the galleries. 



Male genitalia figured from specimen in National Collection from 

 Veitch, Virginia (reared from Pinus taeda June 1, 1914, under Hopk. 

 U. S. no. 12128c, Heinrich). 



Distribution according to specimens in National Collection, 

 American Museum, and collection Barnes : Virginia, Maryland, New 

 Jersey, New York, Massachusetts. 



Alar expanse. — 14-20 mm. 



Type. — In collection Fernald. 



Type locality. — Ithaca, New York. 



Food plants. — Pinus taeda., P. rigida^ P. sylvestria. 



2. PETKOVA VIRGINIANA (Busck). 



(Fig. 55.) 



Evetria virginiana Busck, Proc. Ent. Soc. Wash., vol 16, 1914, p. 145.— 

 Baknes and McDunkough, Check List Lepid. Bor. Amer., no. G774, 1917. 



This is the species referred to by Kearfott (Ins. N. J., 1910, p. 

 538) as Rhyacionia we7izeli Kearfott, but never described by him. 



Male genitalia figured from specimen in National Collection from 

 Falls Church, Virginia (reared from Pinus virginiana., 26 April, 

 1915, Heinrich). 



Distribution according to specimens in National Collection, Ameri- 

 can Musuem, and collection Barnes: Virginia, Pennsylvania, New 

 Jersey. 



Alar expanse. — 17.5-23 mm. 



Type. — In National Collection. 



Ty2)e locality. — Falls Church, Virginia. 



Food plant. — Pinus virginiana. 



3. PETROVA ALBICAPITANA (Busck). 



(Fig. 56.) 



Evetria alUcapitana Busck, Proc. Ent. Soc. Wash., vol. 16, 1914, p. 147. — 

 Baenes and McDunnough, Check List Lepid. Bor. Amer., no. 6778, 1917. — 

 Heinrich, Proc. U. S. Nat. Mus., vol. 57, 1920, p. 57. 



This species replaces virginiana in the West. It is the one that 

 has appeared in our lists as the European pinivorana. The latter, 

 however, is quite different in genitalia and does not occur in our 

 fauna. 



