TRIBE ARCTORNITHINI n.
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Arctornis obtusa Walker comb. n. 
   
Cassidia obtusa Walker, 1862, J. Proc. Linn. Soc., 6:130.
   
Aroa kinabaluensis Strand, 1910, Dt. ent. Z. Iris, 24: 206.
   
Cassidia kinabaluensis Strand; Holloway, 1976: 50.


Arctornis obtusa




Diagnosis.
This and Arctornis meridionalis Holloway comb. n. have similar facies: the angled hindwings and the subapical translucent patches of the pale-brown suffused forewings distinguish them from other Arctornis. The species differ in size and male genitalia: obtusa is larger, with the valve harpe longer and with a diagnostic central bulge.

Taxonomic note. These two species belong to the Cassidia group, reviewed by Holloway (1982b). There is a moderate areole in the forewing venation.

Geographical range. Borneo, Sulawesi.

Habitat preference. The species occurs frequently in a wide range of lowland forest types, and much more rarely at altitude, the highest record being from 1930m on G. Kinabalu.

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