hummingbird clearwing

7853

Common

Two broods: May to September

Meadows, gardens, woodland openings.

This is a common, medium to large, sphinx moth. In poor light or at a distance it is easily mistaken for a hummingbird, due to similarities in both appearance and behavior. It has a wingspan of 19 ⁄16″ to 23 ⁄16″.

When the adult first emerges from the cocoon the wings are completely covered with dark wine-red scales. The scales begin to drop off with the first flight, eventually leaving the wings clear except on the margins and along the veins. The forewing is long and narrow with a smooth, slightly convex outer margin. The forewing cell is boldly outlined and is either mostly covered with dark scales or is bisected by a thin, dark line that looks like, but is not, a vein.

The appendage (tegula) covering the forewing base is olive green. The thorax is unbanded, olive green above, and yellow below.

The abdomen is banded with five colors. Abdominal segments 1 and 2 are olive green; segments 3 through 5 are tan with a few olive-green hairs; segments 6 and 7 are dark wine-red; segments 8 and 9 are olive green, often with a small to large, dark wine red patch in the middle; and segment 10 is black. Tufts of long hairs flare outward from the tenth abdominal segment and look like feathers.

The head is olive green. The antennae are black, thickened, and club-like. The proboscis is long and is coiled under the head when not in use. The legs are yellowish or pale colored.

The caterpillar is lime green and up to 2″ long. The head, thorax, and abdominal segments 1 through 7 and 10 are moderately covered with prominent, minute, white bumps. Abdominal segments 8 and 9 have much fewer, scattered, less prominent bumps. The leading edge of the thorax has a yellow, warty collar. A long, curved, often bluish horn extends from the eighth abdominal segment. A yellow subdorsal stripe extends from the first thoracic segment to the horn. The spiracles are white with a red center and an orange base. The leg-like structures (prolegs) on the abdomen are yellow at the base, black in the middle, and green at the end with an brownish-red band. Mature caterpillars can be found from May onward.

Mostly viburnum (Viburnum spp.), but also honeysuckle (Lonicera spp.), snowberry (Symphoricarpos), hawthorn (Crataegus spp.), and cherry (Prunus spp.).

Flower nectar.

Females attract males by releasing pheromones. After mating, she lays spherical green eggs on the underside of host leaves. The eggs hatch in about one week and the caterpillars begin feeding on leaves and fruit of the host plant. They molt five times in four weeks before pupating. The first generation pupates in a cocoon among the leaf litter on the ground. Adults emerge two to four weeks later. The second generation caterpillar burrows into the soil and overwinters as a pupa and emerges in as an adult in May or June.

Adults fly during the day.

Sources: 7, 21, 24, 29, 75.

Found this Clearwing Hummingbird moth this morning after it spent the night hanging onto a dried thistle bloom.

Location: Pennington Co MN

Found this Clearwing Hummingbird moth this morning after it spent the night hanging onto a dried thistle bloom.