SUBFAMILY HADENINAE
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Euplexidia Hampson

Type species. noctuiformis Hampson, N.E. Himalaya.

This genus contains a number of species with the Phlogophora/Euplexia type of  forewing facies, in this case often developed to form a pale 'Y' in the medial zone of the forewing.

The genus was redefined and reviewed by Yoshimoto (1987b). The basal trifine hair pencils are present and the basal sternite is typical of the 'higher trifines'. A definitive feature of the male genitalia is a dorsally directed costal process on the valve. The corona is absent, and the harpe is reduced or absent. The aedeagus vesica is moderately long, simple, scobinate. The apex of the valve is bifid or spurred in a number of species.

In the female genitalia the ductus bursae is well sclerotised, the ventral margin of the ostium plate-like, often bilobed. There is a small appendix bursae; the bursa lacks signa but is generally scobinate.

The genus is most diverse in the Himalayan region and in Taiwan, but there are endemic species, morphologically distinctive, in Sumatra and Borneo.

The genus may be allied to Tracheoides Prout, which contains two species, T. tamsi Prout (Buru, Sulawesi) and an undescribed taxon from Sulawesi (slide 13967). These have a similar 'Y' shaped development of the reniform and orbicular but have forewings a more intense green and hindwings with a bright yellow ground colour. The male genitalia also show loss of harpe and corona; the undescribed species has a weak costal process and an apical spur to the valve. But there are also distinctive modifications: the peniculus of the undescribed species has narrow external processes; tamsi has a subapical ventral spur to the valve, and there is a globular structure on the tegumen just anterior to the uncus. The aedeagus vesica of both is much as in Euplexidia, and trifine hair pencils are present. Both species are montane.

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