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Griseothosea cruda Walker comb. n.
Nyssia cruda Walker, 1862, J. Linn. Soc. Lond. (Zool.) 6:144.
Thosea cruda Walker; Hering, 1931: 714.

Griseothosea cruda


The facies is typical of the genus. Small grey specimens of Thosea lutea from mangrove have the fasciae oblique to the forewing dorsum. The only congener is described below and distinguished from cruda.

Taxonomic notes. Specimens from Peninsular Malaysia and Sumatra lack the double fold on the interior lamella of the male valve but instead have tapering filaments, finely setose, running from the ends of the juxta horseshoe into slender, tapering pouches within the valve (Fig. 225). The female genitalia are similar to those of the typical Bornean race in lacking a crescent signum and having only a weak spiral to the ductus bursae. The bursa is rounder, less slender, however, with the coarser scobination more in a band, and the setose area of the lamella vaginalis grades away posteriorly over a broad area, rather than extending laterally in a narrow semicircle from the ostium. This taxon is here given subspecific status as G. cruda filamentata ssp. n., but may prove to merit species rank when females of the undescribed Sulawesi species are available for study.

Holotype Perak (Peninsular Malaysia) 2000-2500 feet (W. Doherty) BM limacodid slide 883.

Geographical range. Borneo; Peninsular Malaysia, Sumatra.

Habitat preference. The species has been taken mainly in lowland rainforest, particularly in swamp forest at Badas and even more commonly in dry heath forest at Telisai in Brunei. However, two specimens have been taken in upper montane forest at 1618m on Bukit Retak, Brunei.

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