Butterflies and moths in the Scopariinae, Sesiidae, and Oecophoridae Families

Crambidae family

The Crambidae family are sometimes called Grass moths as the adults are often found resting on grass stems during the day time. There are 129 British species.

Eudonia mercurella

Eudonia mercurella

Above is Eudonia mercurella. Wingspan 16 - 19 mm. Adults fly at night from June - September.

The caterpillar feeds on moss. The caterpillar is cream with brown spots, a shiny brown head and first abdominal segment. It is found in woods, heath and grassland.

Family Sesiidae

There are around 1000 species worldwide, and 14 in the British isles. All in this family have transparent or partly transparent wings and resemble wasps, hornets and other Hymenoptera, also the forewings are vary narrow. Wingspan ranges from 30 - 60 mm. Adults are day fliers, mainly in sunny weather. The Hymenopteran mimicry is believed to confer some protection from predators. The larvae tend to feed in tree-trunks, stems and roots; so are rarely seen. For some species the lifecycle can take as long as 3 years. Usually the eggs are laid singly on the foodplant.

Sesia apiformis, hornet clearwing moth

Above is a preserved specimen of Sesia apiformis, the hornet clearwing moth or hornet moth. As the common name suggests, this moth mimics the hornet.

The hornet clearwing larva feeds in poplar and aspen roots and trunks for around 3 years.

The cocoon is made of gnawed wood and silk, and adults emerge in May, June and July.

The adult female tends to be fatter in the body than the male. The adult wingspan is 33 - 48 mm, and wing length is 15 - 20 mm. It is found in Europe and eastern US, but in the UK its range does not spread as far north as Scotland. It moves with jerky, wasp-like movements, and can even buzz like a hornet. Its habitat includes parks, hedgerows, golf courses, quarries and fens.

Oecophoridae family

There are 25 species in this family in Britain.

Hofmannophila pseudospretella, Brown House Moth

Above is the life stages of the Brown House Moth, Hofmannophila pseudospretella. It is common, and the adult has a wingspan of 15 - 26 mm, and at rest males are 8 mm long and the females 12 mm long. The colour can vary from a dark olive brown to buff, but the thorax and front wings always have dark flecks or spots.

Adult behaviour. When disturbed it will often run into a dark crevice rather then fly.

The larva eats wool, feathers, grains, seeds, dried fruit, wine bottle corks, carpets, upholstery and leather. A fully grown larva can be 20 mm long with a shiny white body and a brown head. It pupates in a tough torpedo-shaped cocoon in the material it has been eating.

Eggs are laid in dust and debris. In heated houses there can be several generations a year.

Spilosoma lubricipeda, White ermine

The White ermine on the right is widespread throughout Europe, and as far east as Japan, and common in the British Isles, but not found in Shetland. Its habitat includes gardens, hedgerows, grassland, heathland, woodland and moorland.

The eggs are laid in batches on the foliage of the foodplants in July.

White ermine caterpillar, Spilosoma lubricipeda

The caterpillar is up to 40 mm long with dark brown/black hair in tufts. It has a light red - cream coloured stripe down its back, and a black shiny head. It eats a wide variety of both wild and herbaceous low growing plants.

The caterpillars feed until autumn. Birds find the caterpillar distasteful - probably because of the hairs. Its Latin name, lubricipeda, refers to the speed the caterpillar can run across open ground when searching for a good site to pupate, and means slippery foot.

They pupate in grey silk cocoons in leaf litter.

The moths have a forewing length of 18 - 23 mm. As the common name suggests the forewing is white or cream with numerous black spots, and the rear wing has at least one black spot.

In warmer parts of the U. K. there can be 2 generations a year.

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