154 PROCEEDINGS ENTOMOLOGICAL SOCIETY 



faint traces of slightly darker lines crossing the wing from these dorsal 

 spots can with difficulty be discerned in certain lights. Ciiia dark golden 

 yellow. Hindwings light fuscous with ochreous fuscous cilia. Abdomen 

 dark fuscous above golden yellow on the underside. Legs golden yellow. 

 Venation typical: Forewings with 7 and 8 stalked. Alar expanse: 13-14 

 mm. 



Habitat: Ashland, Ore., P. D. Serpent, collector. 



Type: Cat. No. 20114, U. S. N. M. 



Bred from Incense Cedar, Libocedrus decurrens. 



Nearest to the Eastern A. alternatella Kearfott, but larger and 

 deeper in color and without the conspicuous mottling of that 

 species. 



Argyresthia f urcatella, new species. 



Palpi, face, head and thorax white. Forewings white, sprinkled w'th 

 dark brown transverse reticulations especially toward the apex; from the 

 middle of the dorsum runs an illdefined outwardly oblique, dark brown 

 fascia to beyond the end of the cell, but does not quite attain ccsta; on the 

 fold between this and the base is a small round dark brown spot; a series of 

 dark brown marginal spots begin on the middle of costa and reach round to 

 tornus. Veins 7 and 8 stalked. Cilia dark ochreous fuscous. Hindwings 

 ochreous fuscous. Abdomen silvery fuscous. Legs white with dark brown 

 annulaticns at the tip of all the joints. Venation typical. Alar expanse: 

 12-13 mm. 



Habitat: Cheyenne Canon, Colo. 



Type: Cat. No. 20207, U. S. N. M. 



Bred by Mr. A. B. Champlain from cynipid gall on Oak. 



Nearest to Argyresthia pedmontella Chambers and rileiella 

 Busck, differing in details of ornamentation, especially by the 

 presence of the round dark spot on the fold, and by having veins 

 7 and 8 in the forewings stalked. 



ON THE TAXONOMIC VALUE OF SOME LARVAL CHARACTERS 



IN THE LEPIDOPTERA.i 



BY CARL HEINRICH, Specialist in Forest Lepidoptera. 



It is not proposed in this paper to enter upon a discussion of 

 all the characters that have been used to distinguish larvae, but 

 merely to consider certain head characters which are particularly 

 valuable for defining generic limits and determining immediate 

 family relationships within the so-called Microlepidoptera. 



1 Contribution from the Division of Forest Insects, Bureau of Ento- 

 mology. 



