Webb's Wainscot

Appearance

For a key to the terms used, see :Glossary of entomology terms.
The wingspan is 32–40 mm. Forewing light yellowish ochreous flushed with rufous, especially in the male; veins paler, and sprinkled with dark fuscous, especially the median vein; lines represented by series of black spots, the outer only distinct and complete; reniform stigma marked by two or more blackish dots at its lower end; a series of black terminal dots; hindwing pale dull yellowish, more or less suffused with fuscous, except towards inner and outer margins. The species is variable both in colour and clearness of markings; thus ab. ''obsoleta'' Tutt is an ochreous form dusted with grey and without any reddish or yellowish admixture; ab. ''rufescens'' Tutt has the forewing more or less strongly reddish and the hindwing suffused with fuscous to outer line; while ab. ''bipunctata'' Tutt has a black dash above median vein, representing the base of an otherwise unmarked orbicular stigma, as the black crescent with its pale centre at end of cell represents the reniform; this form is independent of colour.

Naming

* ''Capsula sparganii sparganii''
⤷  ''Capsula sparganii algaeoides''

Behavior

The moth flies in one generation from July to October and are attracted to light.

Larva are slender, pale yellow green; subdorsal and lateral lines darker; head and thoracic plate pale brown. They feed in the stems of ''Iris pseudacorus'', ''Typha'' and similar watery plants.