Appearance
The wingspan is about 40 mm. It is dark grey brown with a rusty tinge on its body. The abdomen is fuscous. Forewings with sub-basal, antemedial and postmedial double waved lines indistinct. The orbicular small and ochreous, whereas reniform blackish. Submarginal line whitish and irregularly waved. There is a white patch often can be seen between orbicular and reniform and a dark patch on the central marginal area. Hindwings opalescent and semi-hyaline white, with a dark marginal line.Naming
*''S. m. mauritia''⤷ ''S. m. acronyctoides'' Guenée, 1852
Distribution
It is widespread from the Red Sea to India, Myanmar, Sri Lanka, Malaya to Australia and widespread in the Pacific Islands, including the Solomons, New Hebrides, Fiji, Samoa, Hawaii, the Society Islands, Austral Islands, Marquesas and Marshall Islands.Habitat
The larvae feed on various grasses, including rice, wheat, ''Cynodon'', ''Pennisetum clandestinum'', ''Sorghum bicolor'', ''Oryza sativa'', and trees such as ''Casuarina equisetifolia''. They are considered one of the major international agricultural pests on crops and pastures. Unlike other insects, armyworm caterpillars of their sixth instar do not excrete uric acid, instead they excrete urea as nitrogenous wastes.References:
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