Insects of Britain and Ireland: the genera of grass moths (Pyralidae-Crambinae and Schoenobiinae)

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L. Watson and M. J. Dallwitz

Thisanotia Hübner

Adults. Face without a conical hairy prominence. Proboscis functional.

Wingspan 22–26 mm. Forewings broad, cf. Chrysocrambus, whitish, and the whole wing irrorated with large black scales; with a broad brown subcostal band which bifurcates postmedianly, narrower sub-dorsal and dorsal ones which thicken subterminally, and narrow interneural ones towards the termen; an oblique, brown, slightly elbowed median transverse line merging with the longitudinal bands, and a thin brown subterminal line which is strongly curved anteriorly and white-edged distally, and the termen ferrugineous-yellowish with indistinct black dots; the cilia golden-metallic. The fringe glistening-metallic. Termen non-sinuate. Ground colour of the forewings ferrugineous brown (irrorated black). Forewings fairly conspicuously patterned with contrasting colours. The patterning fairly complex; comprising both longitudinal streaking and transverse markings (the veins and costal edge somewhat whitish-streaked, a thick obtusely angled ferrugineous-bown median line, a rounded-angulated white one anteriorly darkly edged, and the termen ferrugineous-yellowish with indistinct black dots). Forewings with a median line; transversely dark-lined towards the termen; the subterminal lines fairly conspicuously white-edged, or not white-edged; without conspicuous white marks at or near the apex; with scattered large black scales. Forewing vein 7 arising from vein 8. Hindwings pale grey to dark grey; plain; brownish or fuscous, without marking other than a fine terminal dark line, the cilia whitish and glossy.

Distribution and habitats. Found only in southern England (associated with chalk substrates - coastal cliffs and downs). England. Occurring in coastal locations and inland. Mesophytic habitats and dry places. British species: T. chrysonuchella. Adults abroad May and June.

Larvae. Larvae feeding on monocots; Poaceae (in the stem bases of Festuca ovina and other grasses, living and finally pupating in a slilken tube).

Subfamily. Crambinae.

Illustrations. • Thisanotia chrysonuchella, with species of Agriphila, Catoptria, Chrysocrambus, Crambus and Pediasia: Leech, 1886. • Thisanotia chrysonuchella, with Chrysocrambus: Barrett. • Hübner’s original illustrations of Thisanotia (1796).


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Cite this publication as: ‘Watson, L., and Dallwitz, M.J. 2003 onwards. Insects of Britain and Ireland: the genera of grass moths (Pyralidae-Crambinae and Schoenobiinae). Version: 8th June 2016. delta-intkey.com’.

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