FAMILY SPHINGIDAE
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Acosmeryx Boisduval

Types species: anceus Stoll.

Species of Acosmeryx are usually purplish to reddish grey, the forewings crossed by a series of fine, sometimes obscure, crenulate fasciae except in the medial zone where there is a definite, often yellow-centred, dark discal dot. A diffuse dark band extends from just beyond the centre of the costa obliquely to the margin subtornally, passing distally to the discal dot. The postmedial series of fasciae is displaced basad posterior to this oblique shade. The anterior half of the shade is often cut off sharply distally by a curved pale zone. The margin of the forewing is slightly excavate subapically.

In the male genitalia the uncus is long, slender, entire, the gnathus shorter, broader, apically excavate. The harpe is distinctive, strongly dilated apically in a trumpet-like fashion, the apex finely spined. At the aedeagus apex is a short band of sclerotisation, partially serrate on the margin, that terminates in a delicate triangular spine.

The larva lacks ocellar markings but has a subdorsal band below which are weak oblique stripes. The body is swollen over A1 and T3, tapering anteriorly to that. Host-plants are mainly in the family Vitidaceae and allies.

The genus is most diverse in the Oriental tropics but extends eastwards to New Guinea and Australia (D'Abrera, 1986: 130).

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