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Life stage
Email (of contributor)
seema.merch@gmail.com
Notes (optional)
Dichromia occatus
https://www.inaturalist.org/observations/149830065
SS: Provisionally agree with ID. Description most closely matches Hypena crassipalpis below (synonym of Dichromia occatus). OD has very poor description. Based on the dentate edge of the forewing apical patch, this is not Dichromia triangularis Moore. Quite a few observations on INaturalist are probably Dichromia triangularis. I have not investigated other Dichromia species from S. India/Sri Lanka.
Dichromia occatus (Moore, 1882)
Hypena occatus Moore, 1882; Descr. Indian lep. Atkinson (2): 191; TL: Cherra Punji; Khasia Hills. Text at https://archive.org/details/descriptionsofne00hewi/page/191/mode/1up?view=theater
Hypena hampsonialis Wileman, 1911; Trans. ent. Soc. Lond. 1911 (2): 261; TL: Japan, Yamato, Yoshino. Text at https://archive.org/details/transactionsofen1911roya/page/261/mode/1up?view=theater
Hypena crassipalpis Butler, 1889; Ill. typical Spec. Lep. Het. Colln Br. Mus. 7: 85, pl. 133, f. 16; TL: Dharmsala. Text at https://archive.org/details/illustrationsoft07brituoft/page/85/mode/1up?view=theater . Plate at https://archive.org/details/illustrationsoft07brituoft/page/n158/mode/1up?view=theater
Dichromia occatus; [MOB17], 192, f. 444, pl. 8.
https://www.mothsofborneo.com/part-17/hypeninae/hypeninae_5_10.php
Diagnosis. The forewings are an ashy grey with a fine triarcuate, oblique postmedial that can have a diffusely darker band immediately basad. The antemedial is irregularly angled, the angle rather rounded and with its concavity basad. The posterior to distal border of the apical patch is stepped, dentate, zigzag. See also the taxonomic note.
Taxonomic note (MOB). Some forms of D. triangularis Moore comb. n. (Indian Subregion, Burma, Taiwan) are very similar, but the posterior boundary of the forewing apical mark is smoothly curved in triangularis and zigzag to dentate in occatus. The black-with-white spots within the apical mark are aligned at right angles to the costa in occatus but form a chevron in triangularis. There is no occatus form to match that of triangularis with a dark medial triangle based on the forewing costa.
https://www.inaturalist.org/taxa/202518-Dichromia-occatus
GI: Dichromia sp. Species confirmation is not possible.
SS: Staying with genus level ID.
https://www.inaturalist.org/observations/149830065
SS: Provisionally agree with ID. Description most closely matches Hypena crassipalpis below (synonym of Dichromia occatus). OD has very poor description. Based on the dentate edge of the forewing apical patch, this is not Dichromia triangularis Moore. Quite a few observations on INaturalist are probably Dichromia triangularis. I have not investigated other Dichromia species from S. India/Sri Lanka.
Dichromia occatus (Moore, 1882)
Hypena occatus Moore, 1882; Descr. Indian lep. Atkinson (2): 191; TL: Cherra Punji; Khasia Hills. Text at https://archive.org/details/descriptionsofne00hewi/page/191/mode/1up?view=theater
Hypena hampsonialis Wileman, 1911; Trans. ent. Soc. Lond. 1911 (2): 261; TL: Japan, Yamato, Yoshino. Text at https://archive.org/details/transactionsofen1911roya/page/261/mode/1up?view=theater
Hypena crassipalpis Butler, 1889; Ill. typical Spec. Lep. Het. Colln Br. Mus. 7: 85, pl. 133, f. 16; TL: Dharmsala. Text at https://archive.org/details/illustrationsoft07brituoft/page/85/mode/1up?view=theater . Plate at https://archive.org/details/illustrationsoft07brituoft/page/n158/mode/1up?view=theater
Dichromia occatus; [MOB17], 192, f. 444, pl. 8.
https://www.mothsofborneo.com/part-17/hypeninae/hypeninae_5_10.php
Diagnosis. The forewings are an ashy grey with a fine triarcuate, oblique postmedial that can have a diffusely darker band immediately basad. The antemedial is irregularly angled, the angle rather rounded and with its concavity basad. The posterior to distal border of the apical patch is stepped, dentate, zigzag. See also the taxonomic note.
Taxonomic note (MOB). Some forms of D. triangularis Moore comb. n. (Indian Subregion, Burma, Taiwan) are very similar, but the posterior boundary of the forewing apical mark is smoothly curved in triangularis and zigzag to dentate in occatus. The black-with-white spots within the apical mark are aligned at right angles to the costa in occatus but form a chevron in triangularis. There is no occatus form to match that of triangularis with a dark medial triangle based on the forewing costa.
https://www.inaturalist.org/taxa/202518-Dichromia-occatus
GI: Dichromia sp. Species confirmation is not possible.
SS: Staying with genus level ID.
Name for copyright (do not include copyright symbol)
Seema Merchant
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No
Species Node
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Organism
Butterfly
Moth Taxon search:
Month
April
Year
2023
Day
24
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