borealis Rothschild comb. & stat. n.
Trichaeta albifrontia borealis Rothschild,
1912, Novit. zool., 19: 123.
Diagnosis. The species has three major transparent patches on the forewing. It can
be distinguished from similar variants of chloroleuca Walker by the
deeper, squarer basal spot (posterior to CuA2). The male genitalia are
characterised by long, narrow, tapering valves. In the female the ostium is
intruded anteriorly into sternite 7.
Taxonomic notes. This taxon was described as a subspecies of a nomen nudum, presumably a
misspelling of albifrontalis Pagenstecher. The latter was described from
Nias and is unlike borealis in facies. The two females dissected vary in
the length of the sclerotised ductus bursae and the lobing of the posterior
margin of the lamella postvaginalis.
Geographical range. Borneo.
Habitat preference. The material in the original description is from
Limbang and the Sungei Tutoh in N. Sarawak. Material to hand is from dry heath
forest at Telisai, Brunei and wet heath forest (kerangas) on a river terrace
associated with the S. Melinau (Mulu survey), a tributory of the Tutoh (two
females in each case). The species is therefore likely to be restricted to heath
and swamp forest habitats and may be localised on river basins in N. Sarawak and
Brunei. It comes to light at night.
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