Orthodes goodelli (Grote, 1875)
Goodell's Arches Moth
WA : Okanogan Co.
Harts Pass Rd. @ Deadhorse Pt., 3841 ft
July 23, 1997, L. G. Crabo.
Specimen courtesy of LGCC
Photograph copyright: Merrill A. Peterson
Orthodes goodelli is a small to medium-sized (FW length 13 - 16 mm) mottled brown moth with a variably distinct pattern usually dominated by pale filling of the reniform spot and subterminal line near the apex that flies in forests from north of northern Oregon during the summer. The forewing is relatively broad in shape. The ground color is variable, usually dull dark gray-brown but occasionally lighter or suffused with dark red-brown or a slight purple tint. The markings are usually indistinct except in a few individuals in which the spots and lower cell between the spots are jet black. The basal, antemedial, and postmedial lines are gray, double filled with the ground color or barely lighter scales, and relatively smooth. The inner component of the postmedial line is weakly scalloped. A faint gray-brown median line is usually evident near the costa. The light ochre-brown subterminal line is irregular, strong near the apex but occasionally prominent to the trailing margin. It is preceded by a slightly darker gray shade, darkest at the costa. A dark terminal line is evident between the veins. The fringe is similar to the rest of the wing in color. A series of pale ochre spots are present on the veins at its base in some individuals. The orbicular spot is pale, oval, and filled with the ground color. The reniform spot is weakly kidney-shaped, usually pale ochre-brown, widest laterally, and filled centrally with the ground color, sometimes partially outlined in gray or black. The claviform spot is small and gray to black. The hindwing is dull brownish gray with barely darker discal spot and veins and a slightly lighter fringe. The head and thorax are the same color as the forewing with a slightly lighter edge to the collar. The eye is covered with fine hairs. The male antenna is filiform.
This species is fairly non-descript in terms of color and pattern but can usually be recognized by its broad wing shape, "soft" indistinct pattern of lines and spots, and pale ochre outline of the reniform spot and anterior subterminal line. It is most similar to Orthodes noverca and Orthodes detracta. It differs from O. noverca, a common and widespread Northwest species, in having a claviform spot and lacks black posterior outline to the orbicular spot that is characteristic of this species. Orthodes detracta, a smaller species that occurs in British Columbia, has better defined forewing markings with a large black claviform spot and a black basal dash. Orthodes goodelli could potentially be confused with Aseptis binotata, but species in this genus lack hairs on the eyes. Species of Aseptis have a characteristic concave notch in the outer margin of the hindwing that is lacking in Orthodes.
This species is widely distributed across Canada, with a disjunct population in foothill and canyonland habitats of the Columbia Basin east of the Cascades. It may have a preference for riparian habitats along creeks and rivers at middle elevations.
Orthodes goodelli reaches the western limit of its range in our area. It occurs in southern British Columbia, eastern Washington, and the Blue Mountains of northeastern Oregon and adjacent northwestern Idaho.
This species is most widespread in eastern North America where it is found from southern Canada to Florida and Alabama. The range extends west to our region through the Canadian Prairie Provinces.
No information is presently available regarding larval foodplants of this species.
Orthodes goodelli flies from late spring to early August, apparently with a single brood. Forbes (1954) reports the presence of two broods in the East. It is nocturnal and comes to lights.