Bornean Noctuidae of the `trifine' subfamilies Noctuinae (11 spp.) Heliothinae (2 spp.), Hadeninae (32 spp.), Acronictinae (7 spp.), Amphipyrinae (121 spp.) and Agaristinae (14 spp.) are described following an introductory section that considers the possible monophyly of the Trifinae. Features such as the loss of vein M2 in the hindwing, presence of complex hair-pencils in the base of the male abdomen, ornamentation of the bursa copulatrix with band-like signa in the females and presence of a costal process associated with the harpe in the male genitalia are used to suggest relationships between the subfamilies.
Biogeographical and ecological patterns in the groups are discussed, and host-plant specialisations noted. Arboreal feeding appears to be primitive, with `higher trifines' tending to be open habitat specialists and including economically important genera such as Agrotis, Helicoverpa, Mythimna, Spodoptera, Athetis, Sesamia and Condica that contain many species with large geographical ranges. Many montane taxa, some with bipolar distributions, are also included.
The genus Sphetta (1 sp.) is transferred from Amphipyrinae to the Notodontidae, together with the non-Bornean genus Cyphanta.
For each species a diagnosis and the geographical range are given and, where known, details of habitat preference and biology. Summary lists are provided of the new taxa described (3 genera, 28 species and 1 subspecies) as well as numerous other taxonomic changes. There is a checklist of all Bornean taxa.
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