arge moth

not listed

NNR - Unranked

not listed

Arge moth is a common, medium-sized, tiger moth. It occurs in North America from southern Quebec to northern Florida, west to South Dakota and New Mexico. It is most common in northeast and south-central United States, less common in Minnesota. Larva feed on the leaves of many low-growing plants and vines, including corn, dock, goosefoot, grape, plantain, prickly pear, smartweed, and sunflower. Adults are found in from April to September in dry open areas, including dry woodlands, dunes, grasslands, meadows, pastures, sand plains, and waste lots. They do not feed.

Adults are robust, hairy, and creamy-white and black, sometimes tinged with pink. They are ¾″ to 1″ (20 to 26 mm) in length and have a 1½″ to 2″ (38 to 50 mm) wingspan. The thorax is densely covered with long, creamy white hairs, sometimes partially tinged pinkish. It has three black longitudinal stripes and a dark pink collar. The abdomen is mostly white, tinged pink on top (dorsally), with two rows of black spots on each side. The head is white. The antennae are black. On the male they are feathery, with extensions along both sides of the shaft (bipectinate). The antennae on the female are slender and thread-like. The mouthparts are not functional.

The male forewing length is 11⁄16″ (18.3 mm). The forewing is mostly white. The background color is black. The veins and bands are white. The leading edge (costal margin), inner margin, and outer margin all have a broad white band on the border. Most veins are broadly bordered with white. The anal vein (A1+2) is white but is not bordered, and it merges with the band on the inner margin. The postmedial (PM) band is sharply bent, touches the subterminal (ST) band, and meets the costal margin at an oblique angle. The ST band is W-shaped. The fringe is white. The costal cell (C1) is white, being overlayed by the broad costal border. This feature distinguishes arge moth from all other Apantesis moths except Apantesis doris, which does not occur in Minnesota.

The hindwing is white and is shaded with pink. It has just a few small black spots. The larger spots, if any, are divided by white or pink lines.

The female is similar but has a forewing length of 15⁄16″ (23.8 mm).

The caterpillar is purple to charcoal black and 1¾″ (45 mm) long. There are prominent white stripes in the middorsal and subdorsal areas. These white stripes often have areas tinged with orange. The body is covered with clusters of long hairs (setae). Each cluster rises from a black wart. Each lateral wart has at least one very long seta.

Total length: ¾″ to 1″ (20 to 26 mm)

Wingspan: 1½″ to 2″ (38 to 50 mm)

Dry open areas, including dry woodlands, dunes, grasslands, meadows, pastures, sand plains, and waste lots

Two generations per year: April to September

Adults will come to black light. The wings are held over the body like a roof when at rest.

Many low-growing plants and vines, including corn, dock, goosefoot, grape, plantain, prickly pear, smartweed, and sunflower

Adults do not feed.

Sources

21, 24, 27, 29, 30, 71, 75.

Common

Family
In 2011 the family Arctiidae (tiger moths and lichen moths) was transferred to the family Erebidae mostly intact but demoted to a subfamily. The former subfamilies are now tribes, the former tribes are now subtribes.

Genus
Until recently, this species was placed in the genus Grammia.

Location: Kellogg Weaver Dunes SNA, Weaver Dunes Unit