FAMILY SPHINGIDAE
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Enpinanga vigens Butler stat. rev.
Angonyx vigens Butler, 1879, Trans. ent. Soc. Lond. 1879: 262.
Enpinanga vigens Butler; Rothschild & Jordan, 1903: 546.


Enpinanga vigens
(.90 natural size)


Enpinanga vigens
(.90 natural size)


Diagnosis.
The male forewing has a smaller discal patch than the next species; the medial band is continued more weakly posterior to the discal spot to meet the dorsum; in borneensis the anterior part is very broad, dark, the posterior part almost absent. The hindwings of both sexes have a weak pale submarginal, absent in borneensis. In the female the medial band of the forewing is uniformly narrow; in borneensis there is a broader, more diffuse shade that is thicker centrally.

Taxonomic notes. The Bornean race is referable to ssp. vigens from the Philippines. Other races fly in Sumatra and Java. This species has been subordinated to E. assamensis Walker by recent authors (e.g. Diehl, 1980). But E. assamensis has forewing facies much closer to E. borneensis, with the aedeagus of the male genitalia also as in that species (Rothschild & Jordan); the harpe of the valve in assamensis is closer to that of vigens. The more extreme modification of dark patches in the medial zone of the wing shared by assamensis and borneensis suggests these are sister-taxa rather than assamensis and vigens. The blunt, broad harpe of borneensis is an autapomorphy.

Geographical range. Sundaland, Philippines.

Habitat preference. Three specimens taken recently in Brunei were all from lowland rainforest.

Biology. The shape of the larva has been described in the generic introduction. The skin is granulated. The colour is variable: green, red or brown with white granules. There are two dorsolateral stripes and oblique lateral rows, white and yellow in green and red caterpillars, purplish brown in brown ones.

The host-plant recorded was Tetracera (Dilleniaceae).

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