SUBFAMILY HADENINAE
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Sasunaga tenebrosa Moore
Hadena tenebrosa Moore, 1867, Proc. Zool. Soc. Lond. 1867: 59.
Stictoptera albonotata Wileman & West, 1928, Ann. Mag. nat Hist. (10), 2: 533, syn. n.
Sasunaga tenebrosa Moore; Holloway, 1976: 9,


Sasunaga tenebrosa


Sasunaga tenebrosa
 


Diagnosis.
This is a blacker insect than longiplaga, with stronger transverse fasciation posterior to the reniform stigma of the forewing. The male hindwing is less triangular than in longiplaga. Some specimens have a central white streak just basal to the position of the orbicular. S. longiplaga has a pucker on the left valve of the male genitalia corresponding to the flange on the right valve; this pucker is absent in tenebrosa. The valve in longiplaga is longer, more tapering, with a longer row of coronal setae.

Taxonomic notes.
There is a large complex of very similar species that has been referred to S. tenebrosa Moore (e.g. Holloway, 1976, 1979; Robinson, 1975). The type of tenebrosa, a male from Bengal in the A.E. Russell collection, appears to be lost so a specimen from Kangra in N. India (slide 11695) is taken as reference for tenebrosa. The species-group is defined by: lack of trifine hair-pencils; a deep apex to the uncus of the male genitalia; a transverse flange on the right valve just distal to the harpe. The last is lacking in New Caledonian material, but examination of the Australasian representatives of the group has not been undertaken. Sundanian and Wallacean material of tenebrosa has the valve more tapering over the distal half.

Geographical range.
Indian Subregion to Sundaland, Philippines and Sulawesi; Papuan Subregion taxa need investigation.

Habitat preference.
The altitude range is as for the next species but abundance is more even from the lowlands upwards.

Biology.
The larva was described by Gardner (1946). It is green, smooth, with black spots, the spots being basal to many of the primary setae. The spiracles are black, that of A8 in a triangular red spot. Bell (MS) referred to a thin white dorsal line and a yellow subspiracular band. It is possible that either this or the next species, or both, were available to these authors.

The larva lives on the underside of young leaves of the host-plant and eats these. Pupation is in the soil in a silken cocoon.

The host-plant is Ventilago (Rhamnaceae).

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