Autographa speciosa Ottolengui, 1902

93-1198

Identification

Adults

Autographa speciosa is a medium-sized (FW length 17 - 18 mm) gray and black moth with a smooth black to brown-black median area beneath a silver-white stigma that flies in forests of the western Pacific Northwest during the summer. The forewing has a slightly pointed apex and a small flange at the anal angle. The ground color is smoothly mottled violet gray, lightest at the base, along the inner antemedial and posterior postmedial lines, and in the posterior terminal area. The median area posterior to the cubital vein is velvety black to brownish black. All but the medial subterminal area is blackish gray, gradually darkening toward the subterminal line. The lines are dark gray, double with violet-gray filling. Two small black spots are associated with the basal line, one on each side of the cubital vein. The antemedial line is oblique across the costa near the orbicular spot, strongly offset toward the base across the cell, then strongly oblique and slightly incurved toward the base below the cell. The postmedial line is drawn toward the base on the costa, then slightly irregular in a straight line across the rest of the wing nearly perpendicular to the trailing margin. The subterminal line is pale, very thin and incomplete, slightly irregular with a prominent W-mark centered on vein CuA1. The terminal line is thin, black. The fringe is white with gray checkering. The orbicular and reniform spot are thin, pale gray. The orbicular spot is a small tilted oval filled with the ground color. The reniform spot is partially outlined in black on the inside and outside, hourglass shaped and touching the postmedial line. The hindwing is slightly brownish gray, suffused with gray medial to a faint postmedial line and darker toward the outer margin, with gray discal spot and thin terminal line. The hindwing fringe has a white edge and checkered yellow and gray base. The head and thorax are olive gray-brown with lighter gray edges on the collar, tegulae, and loose tufts on the posterior thorax. Additionald dark dorsal tufts are present on several of the abdominal segments. The male antenna is filiform.

This species can be identified in its western range by the black and violet -gray forewing with a silver-white stigma. It is quite similar to Autographa v-alba which occurs from the Cascade crest east and prefers high-elevation habitats. The color is subtly different between these moths, slightly browner in A. speciosa and purer black and gray in A. v-alba. The shape of the stigmas also differs. That of A. speciosa has a thick rounded lateral extension or separate dot, while that of A. v-alba tends to be V- or sideways fishhook-shaped without any lateral projections.

The type locality of Autographa speciosa Ottolengui is Canada, British Columbia, Vancouver [probably Vancouver Island].

Habitat

This species occurs in moist forests along the West Coast.  It has been collected in two very different habitats in Oregon.  One consists of subalpine meadows at high elevations in the Cascades, while the second habitat consists of old-growth rainforests at low elevations in the Coast Range.  It can be moderately common in both habitat types, but tends to be local and sporadic.  Autographa speciosa has been found in second-growth forest in southern Washington, and in mixed hardwood-conifer forests in southwestern Oregon. This species is considered to be sensitive to forest management, depending upon undisturbed habitat.

This species was only known from three sites at the time of the Plusiinae fascicle of the Moths of America North of Mexico series (Lafontaine and Poole 1991). It is now known to be more widespread in forests in our region.

Distribution

Pacific Northwest

Autographa speciosa is found in the western part of the Pacific Northwest, west of the Cascade summit, from southern Vancouver Island to southern Oregon. The range appears to be limited to the southern Cascades in Washington, but it is found in the Cascades and Coast Ranges in Oregon.

Global

This species also occurs in northern California, as far south as the northern Sierra Nevada.

Life History

Larvae

No information is presently available regarding larval foodplants for this species, but it probably feeds on herbaceous plants like related species.

Adults

The flight season of A. speciosa is the summer, with records from June to August in our area. It is nocturnal and comes to lights.

Economic Importance

None.

Literature

BugGuide

Lafontaine & Poole (1991)

Miller & Hammond (2007)

Moth Photographers Group