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Gyrtona
semicarbonalis Walker
Gyrtona semicarbonalis Walker,
1863, List Specimens lepid. Insects Colln Br. Mus. 27: 92.
Gyrtona rotundalis Walker,
1863, Ibid. 27: 93.
Gyrtona thoracica Walker, 1863, Ibid. 27: 96.
Gyrtona spilalis Walker, 1863, Ibid. 27: 97.
Gyrtona physicoides Moore,
1885, Lepid. Ceylon 3: 125.
Lophoptera angusta Pagenstecher,
1900, Zoologica 12 (29): 92.
Gyrtona
semicarbonalis 
Gyrtona
semicarbonalis 
Gyrtona
semicarbonalis |
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Diagnosis. This species has forewings that are more produced and rounded apically
than in those discussed already. The forewings are variable in pattern, often
almost black in the male but usually medium brownish grey in the female. Many
specimens have diffuse, darker, longitudinal striae on the forewing; some have a
central dark band, others have the entire basal half dark; fine dark transverse
fascia are evident in some specimens, especially in the basal half and
submarginally. The species is most reliably identified by characters of the
genitalia: in the male the valve arms are very slender, the ventral one
outcurved, the dorsal one with a basal process similar to the harpe; in the
female the bursa lacks a signum and the ductus bursae opens into a broad pouch
which has small lobes laterally.
Geographical range. Indo-Australian tropics to as far east as Vanuatu.
Habitat preference. During the Mulu survey the species was found to be
abundant in lower and upper montane forest on the limestone G. Api, frequent in
the same zones on G. Mulu, and taken singly at 250m on G. Api (lowland forest)
and in alluvial forest at Long Pala. In Brunei it has been taken singly in a
range of lowland habitats and more frequently in dry heath (kerangas) forest at
Telisai. It is thus akin to the previous species in habitat preference.
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