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Diehlea Kobes

Type species: tumida Hampson, Borneo.

The last genus of the Carea facies type has th
e forewings distinctly broadened distally, the costa becoming strongly concave in some species, shaping the forewing like an axe-head. Moths with typical facies can have a bell-shape when at rest, particularly males of D. ducalis Bryk comb. n., and are sexually dimorphic, females tending to have modification of the forewing shape less extreme.

The male abdomen is typically careine. In the genitalia the uncus is tapering, apically falcate. The subscaphium is prominent, elongate. The tegumen is strongly expanded ventrally on each side. The valves are broad, rather rectangular, with the central lamina rather flimsy and balloon-like; the costal process is overlapped by a basally directed lobe on the margin (seen also in Didigua), and the ventral margin of the valve usually has a central lobe. The aedeagus vesica is globular, with variably one to three strong, narrow cornuti.

The female (type species) has a narrow, convolute ductus, expanding into a thickened zone, also convolute, at the base of the corpus bursae opposite the origin of a narrow appendix bursae. The bursa is expanded distal to this, slightly corrugate, the signum a narrow, longitudinal band of sclerotisation with a central ‘nipple’.

All described species are Sundanian, with tumida extending to the Andamans (D. nicobarensis Warren comb. n. from the Nicobars appears to be closely related to tumida). There are possibly undescribed species in Sulawesi and Seram.

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