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Idaea ptyonopoda Hampson  
Acidalia ptyonopoda Hampson, 1895, Trans. ent. Soc. Lond., 1895: 313.

Idaea ptyonopoda (x 1.16)

This and the next species have facies typical of a large number of straw-coloured, lightly fasciated. Oriental species and are more reliably distinguished by genitalic examination. I. ptyonopoda has distinctly maroon hindtibial scent-pencils in the male. The male genitalia have an enlarged seta subapically, ventrally on the valve. The aedeagus vesica has a single cornutus with a rather sinuous flexure centrally. The female has the bursa immaculate rather pyriform, extending basally beyond the insertion of the ductus, from where there is also a short lateral diverticulum or appendix.

Taxonomic notes. The male second sternite has a prominent pouch. A specimen from Peninsular Malaysia (slide 18575) has the aedeagus vesica strongly spined in addition to the major cornutus. It may represent a distinct species.

Geographical range. N.E. Himalaya, Hong Kong, Borneo, ?Peninsular Malaysia.

Habitat preference. A male was taken at 1000m in lower montane forest on G. Mulu. A female (slide 18526) from about 1700m on G. Kinabalu is probably also ptyonopoda as it compares well with three from a larger series from Hong Kong.

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