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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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