FAMILY SPHINGIDAE
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Theretra silhetensis Boisduval
Choerocampa silhetensis Boisduval, 1879, Hist. nat. Insectes, Spec. Gen. Lep., 1: 240.
Theretra pinastrina Martyn sensu Rothschild & Jordan, 1903: 783; auctorum.


Theretra silhetensis
(.83 natural size)


Diagnosis.
See Theretra oldenlandiae Fabricius.

Geographical range. Indo-Australian tropics east to Samoa.

Habitat Preference. T. silhetensis appears to be commoner than T. oldenlandiae, taken in similar agricultural and open habitats in the lowlands,

Biology. The larvae are exceedingly variable, from yellow green and green to brown or greyish black ones (Bell & Scott, 1937; Dupont & Roepke, 1941). All forms are diffusely striped longitudinally, with a row of small, even, oval dorsolateral ocelli on the abdominal segments; the ocelli are obscure in darker forms, but dark blue ringed with yellow on A1 and A2 and larger, blue-centred, ringed green, brown, yellow and black on more posterior segments.

Recorded host-plants (Bell & Scott, 1937; Pholboon, 1965; Miyata, 1983; CIE records; FRIM records) are: Arum, Caladium, Colocasia, Pistia (Araceae); Kochia (Chenopodiaceae); Ipomoea (Convolvulaceae); Boerhavia (Nyctaginaceae); Ludwigia (Onagraceae); Rosa (Rosaceae); Trapa (Trapaceae, aff. Onagraceae).

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