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.