View Image Gallery of Family Lasiocampidae

Syrastrena Moore

Type species: minor Moore.

This genus has been reviewed by Holloway (1982: 198). The species are small, in shades of medium to pale reddish brown, with two oblique fasciae on the forewing; both fasciae consist of a pale line edged more darkly distad.

Humeral veins are present in the hindwing (Fig. 3).

Figure 3. Hindwing venation of Lasiocampidae: left, most frequent South-east Asian configuration (paralebeda); top right, gastropachine configuration (Gastropacha leopoldi), with numerous humeral veins anterior to Sc, and a major additional cell between Sc and Rs; bottom right, Syrastrena, with rather basal humeral veins, otherwise similar to Paralebeda.

The male genitalia are diagnostic, with the tegumen unsclerotised but having lateral setose processes (similar but smaller processes are present in Arguda). The valves are bifid, the dorsal and ventral processes slender and much longer than the central one. The cubile is broad, bearing two submarginal or marginal areas of spines separated by a central flange or scobinate boss. The aedeagus is very broad with no ventral spur; the vesica is very variable with several short lobes, some of which bear scobinate patches or terminal spines.

Like the previous two genera, Syrastrena is restricted to the Oriental tropics. It occurs in Mindanao but has not been recorded elsewhere in the Philippines or from Sulawesi.

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