Plagiomimicus yakama Crabo & Wikle, 2018

93-1659.1

Identification

Adults

Plagiomimicus yakama is a small species (FW length 12–13 mm) with a geometric pattern of different shades of olive separated by white lines that flies in the Columbia Basin during early summer. The forewing apex is pointed, slightly hooked in a few individuals. The color is darkest olive in the median area, followed in darkness by a small ellipse along the distal costa (called the subapical spot). The rest of the wing is paler whitish-green. The basal line is absent. The antemedial and postmedial lines are similar pale whitish gray. The antemedial line is smooth and mildly convex toward the outer margin. The postmedial line is also smooth, bent acutely near the costa with the apex of the bend directed laterally. The subterminal line is pale, mostly thinner than the other lines, but the apical segment is wider and is connected to the bend in the postmedial line by an additional curved white segment. The fringe is pale gray-green, slightly darker at the base. The spots are nearly absent, with the reniform spot evident as a dark smudge near the anterior postmedial line. The hindwing is medium gray with a pale fringe, slightly darker in the median area. A raised D-shaped tubercle with a central cone-shaped protuberc is present on the frons of the head. The head and thorax are pale olive-gray. The male antenna is filiform.

This species can be identified by its unique olive color and geometric pattern of white lines.

The type locality of Plagiomimicus yakama is Satus Creek, Yakima County, Washington. 

Habitat

This species is widely distributed in desert habitats of the Southwest, but appears to be rare and sporadic on very dry sagebrush steppe at low elevations in the Pacific Northwest.

Distribution

Pacific Northwest

Plagiomimicus tepperi flies in the Columbia Basin in the Northwest and has been found in Oregon and Washington. In Washington it is most common near the Columbia River.

Global

This species is found in two separate areas in the American West. The nominate subspecies occurs in the Pacific Northwest. Subspecies P. yakama mojave is found in southern Utah, Nevada, northeastern Arizona, and southern California. Plagiomimicus yakama was until recently considered to be conspecific with Plagiomimiucs tepperi a species that is found farther east from Colorado and Texas to central Arizona.

Life History

Larvae

This species apparently feeds on brickelbush (Brickellia spp.) in the Asteraceae.

Adults

Adults fly in late spring and early summer and have been collected from mid-May to early July in the Columbia Basin. They are nocturnal and come to lights. Some specimens were collected in a malaise trap placed in a coulee near Vantage, Kittitas County, Washington.

Economic Importance

None.

Literature

Crabo et al. 2018

BugGuide

Moth Photographers Group

Poole (1995)