TRIBE LITHOSIINI
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Macotasa Moore

Type species: biplagella Butler, Borneo.

This genus was redefined and revised by Holloway (1982). There are several diagnostic features of the facies, where there is marked sexual dimorphism, and of the male genitalia. A fold in the cell on the male forewing ridges the dorsal surface, the basal part of this ridge being covered by an area of coarse scales from the costa to just beyond the ridge. There is a blackish mark extending from the central arching of the costa to the distal end of the ridge (fig 2e). 


Fig 2e: Macotasa tortricoides Walker


A curved groove runs from the cell towards the margin just anterior to the tornus. The females lack these structural modifications though they usually have a black costal mark and diffuse blackish shading elsewhere on the forewing.

The male genitalia are characterised by trifid valves and a furcate juxta as described by Holloway (1982) and illustrated here. The triple structure of the valves is somewhat modified in the last species discussed below. The uncus can be bifid or entire.

The female genitalia are varied but tend to have a pyriform corpus bursae that has a small scobinate signum.

The genus is restricted to the Oriental tropics.

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