Trichocerapoda strigata (Smith, 1891)

93-3082

Identification

Adults

Trichocerapoda strigata is, as the name suggests, a streaky gray moth. It is small (FW length 11 - 13 mm) with a long claviform spot and a small spike toward the base on the lower medial reniform spot. The forewing apex is slightly elongate. The color is medium-dark gray, with thin dark veins and a black basal dash. The terminal area is darker gray than the rest of the wing. Some specimens show a slight tan flush in the cell and fold. Pale on each side of the cubital vein produces a long mark resembling the claviform spot medial to the orbicular spot. The lines are nearly absent, evident as faint gray spots on the costa. Some specimens show a portion of the postmedial line as a gray transverse mark lateral to the reniform spot and a slanted mark below the spot. The subterminal line is evident as the irregular transition from the paler subterminal area to the dark terminal area, including an ill-defined pale W-mark on M3 and CuA1. It is preceded by dark gray or black spots near the anal angle in most specimens. The terminal line is thin and dark. The fringe is gray with dark checkering. The spots are outlined in thin black on the outside with a thin white inner line and are filled with the gray ground. The orbicular spot is very long, oval, sometimes touching the reniform spot. The reniform spot is kidney-shaped with a spike-like extension toward the base from the lower inner corner that most often extends to the lateral orbicular spot. The claviform spot is very long. The hindwing is whitish gray in males, medium gray in females, with a poorly-marginated gray marginal band and thin dark terminal line. The veins are slightly darker gray than the ground. The fringe is white with a gray base that is darker in females. The head and thorax are powdery gray with a weak black transverse line on the collar. The eye is covered with sparse fine hairs. The male antenna is biserrate.

This species can be recognized by its small size and streaky gray appearance, reniform spot with a basal spike, and long claviform spot. It is most similar to Trichocerapoda oblita but is smaller and lacks the strong white component of the lower reniform spot of this species. It also resembles pale desert populations of Lacinipolia pensilis. These are pale gray but less streaked than our Trichocerapoda species. They lack a long claviform spot and the basal extension of the reniform spot, and have a pale yellow and black mark near the anal angle that T. strigata lacks.

Habitat

This species is widely distributed on dry rangelands in the Great Basin region.  In the Pacific Northwest, it is usually rare to moderately common in juniper woodlands and on dry sagebrush steppe at low elevations east of the Cascades.

Distribution

Pacific Northwest

Trichocerapoda strigata is found in the dry interior of the Pacific Northwest as far north as the Okanogan River Valley in northern Washington.

Global

The range of this species extends south through eastern and southern California. A single record is shown for southern New Mexico on the Moth Photographers Group web site.

Life History

Larvae

No information is presently available regarding larval foodplants of this species.

Adults

Trichocerapoda has a fall flight, usually appearing in early September and flying into October. It is nocturnal and comes to lights.

Economic Importance

None.

Literature

Moth Photographers Group