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Achrosis fulvifusa Warren comb. n.
Prionia fulvifusa Warren, 1901, Novit. zool., 8: 31.

Achrosis fulvifusa

The obliquely banded rufous brown wings distinguish this and the next species. The two are separated as indicated in the description of the next.

Taxonomic notes. The third member of this group, the Indian A. intexta Swinhoe comb. n., has facies much as in the new species, but with furca arms shorter and more curved than in fulvifusa; in all three the furca arms are symmetrical. The group is represented in Sumatra, but the identity of the species has yet to be established.

Geographical range. Borneo, Peninsular Malaysia (Penang).

Habitat preference. The species shows a preference for lowland dipterocarp and alluvial forest.

Biology. Bell (MS) described the larva of intexta as similar in shape to that of rondelaria Fabricius (as squalidaria Guenée). The head is smaller than T1, the anal claspers are splayed, and the body is thickest in the middle, with T3 and A1 slightly swollen-looking laterally when the larva is in its highly looped resting posture. The colour is a light pinkish brown, marbled with white (also in irregular longitudinal bands) and smoky black; there are large lateral light yellow patches anteriorly on A3 and A4; T1 is anteriorly orange.

The larva rests highly looped on the undersides and edges of leaves. It falls on a silken thread if alarmed. Pupation is in a slight, roomy cocoon between two leaves or within the folded edge of a leaf.

The host-plant is Ixora (Rubiaceae).

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