|scientific name Argyresthia flexilis |
Restricted in its distribution to the narrow range of the food plant, limber pine.
Adults fly in late June (Freeman 1960: 28)
"Antenna white, banded with fuscous, and with some brown scaling at base. Palpus white inwardly, yellowish outwardly, and slightly fuscous at apex. Head white. Thorax yellowish-white in male, particularly at base and on disk; of female white. Hind wing smoky. Fringes of all wings shining white. Under surfaces of all wings fuscous, with white fringes. Hind leg white, terminal tarsi with fuscous bands. Fore and mid-tibiae and tarsi, fuscous. Wingspread: 11 mm." (Freeman, 1960: 28).
Male genitalia described and illustrated in Freeman (1960: 39, fig. 49; as well as 1972: 692, Fig 21).
The food plant of this species, limber pine (Pinus flexilis) is not consumed by any other Argyresthia in Alberta. Morphologically it is closely related to A. calliphanes, which is larger and feeds on alder.
The species is a needle miner. "The late instar larva ties the needles into a bundle and mines two or more of them, starting below the middle of the needle, and mining toward the apex for a distance of approximately the central third ... Frass is ejected through the mine entrance. At maturity, the larva constructs a new bundle, within which it pupates in a dense, white cocoon" (Freeman 1960: 29).
Not of concern.
Type material was reared from larvae on limber pine, Pinus flexilis James (Freeman 1960). Damage on mined needles is illustrated in Freeman (1960: 48; fig. 67).
Known only from type locality in northern Montana (St. Marys and Babb), but undoubtedly occurring in adjacent parts of Canada (Freeman, 1972: 692).
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