NORTH AMERICAN EUCOSMINAE. 69 



63. THIODIA GRINDEUANA (Busck). 



(Fig. 117.) 



Cydia grindeliana Busck, Can. Ent., vol. 38, 1906, p. 211. 



Evcosma grindeliana Babnes and McDunnough, Check List Lepid. Bor. Amer., 

 no. 7070, 1917. 



This species is very close to stramineana Walsingham. It differs 

 chiefly in its larger size and larger genitalia. Also in many speci- 

 mens of grindeliana there is more or less longitudinal dusting of 

 fuscous on the fold and along the cell. This character is not con- 

 stant, however, and some of the paratypes are as clear yellow as 

 stramineana^ without any such fuscous streaking. It may prove to 

 be a large race of stramineana but for the present will have to be 

 kept separate. 



Veins 3 and 4 of hind wing are stalked. 



Male genitalia figured from paratype in National Collection. 



Specimens in National Collection and American Museum from 

 Clarendon, Texas. 



Alar expanse. — 17-19 mm. 



Type. — In National Collection. 



Type locality. — Clarendon, Texas. 



Food plant. — Grindelia squarrosa., variety n/uda. 



64. THIODIA STRAMINEANA (Walsingham). 

 (Fig. 118.) 



Semasia stramineana Walsingham, Illus. Lepid. Heter. Brit. Mus., vol. 4, 1879, 



p. 60. 

 TModia stramineana Feknald, in Dyar List N. Amer. Lepid., no. 5193, 1903. 

 Eucosma stramineana Barnes and McDunnough, Check List Lepid. Bor. Amer., 



no. 7076, 1917. 



According to Walsingham's description veins 3 and 4 of hind wing 

 are united. His specimens were from Colorado and very small. 

 Those that I have seen in the collections as stramineana show veins 

 3 and 4 stalked and they average a little larger except some from 

 California. These latter have the stalk of veins 3 and 4 very long 

 and in some cases the fork is only visible at termen. It is possible 

 therefore that the venation varies as in a number of other TModia 

 and the species has 3 and 4 both stalked and united. In pattern and 

 color the specimens we have been calling stramineana match Walsing- 

 ham's description and figure. Should it eventually prove that the 

 true stramineana has veins 3 and 4 always united the specimens we 

 are now calling that species will need a new name. 



Male genitalia figured from specimen in National Collection from 

 Mesilla, New Mexico. 



