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Hyalostola Hampson

Type species: phoenicochyta Hampson.

This genus was represented until recently by the virtually descaled and damaged holotype. Fresh material from Brunei throws further light on its appearance and structure.

The antennae of both sexes are bipectinate, relatively small. In the forewing R1 and R2 are separate from the branching system of R3-5, R1 anastomosing briefly with Sc, and R2 and R3 converging but not forming an areole.

The ground colour is pale grey, marked with red in a broad, irregular medial zone and irregularly submarginally on the forewing and in a broad submarginal band on the hindwing. The grey is more lightly suffused reddish elsewhere.

In the male abdomen the anterior margin of the fourth sternite is narrowly thickened. The narrow eighth sternite has long apodemes and is apically rather square with a scattering of setae. The apex of the eighth tergite is more membranous, also with setae set on papillae. The genitalia have a ring-like tegumen, with a pair of spines, possibly socii, associated with the anal tube. The valves are deeply divided, the upper arms much longer than the lower, with a triangular sclerite in the cleft. The vinculum grades into a squarish sclerotised sheet in the intersegmental membrane. The aedeagus apex is upturned, rugose.

The female genitalia have the ovipositor lobes unequally trilobed on each side. The ductus bursae is short, irregular in width, the bursa ovate with a large, flat, elliptical, scobinate signum.

The genus appears to be endemic to Borneo, but related to Auzatellodes (See Auzatellodes).

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