Chorsia inordinata Walker stat. rev.

Acontia inordinata Walker, [1863] 1884, J. Proc. Linn. Soc. (Zool), 7: 50.

Diagnosis

The forewing facies is variegated in shades of grey and white with some rufous components, resembling maculosa Walker and griffini Holloway, but there is a distinctly trapezoidal but narrow dark grey bar posterior to the reniform, and the antemedial border to the medial dark zone is almost a right-angle where it gives way to the basal pale zone. The hindwing is a much darker grey than in the other two species. The male abdomen (slide 19578) has the eighth segment unmodified. The valves of the genitalia are tongue‐like with a subbasal, thumb‐like spur from the interior margin of the sacculus. The aedeagus vesica is globular, without ornamentation. The female genitalia have a broad ductus bursae, and the corpus bursae lacks signa.

Taxonomic note

This species was transferred to Chorsia from Hyperstrotia Hampson in Part 13, but not redescribed. Poole (1989) listed the N.E. Himalayan taxon procrita Swinhoe as a synonym of inordinata, as the forewing facies is similar. However, the part of the dark grey medial zone posterior to the reniform is centrally rufous rather than with a pale interior, and dark grey is more extensive in the marginal zone, especially along the submarginal, which has a more extensive rufous component; there is also a rufous streak running basad from the reniform. The male abdomen is similar to that of inordinata except the valves are relatively shorter and the processes from the sacculus are more robust, sinuous, tapering to an acute apex. The aedeagus is slightly narrower than in inordinata. The female has a very much narrower ductus bursae. The ostium is flanked, by a pair of oblique, sclerotised, conical pockets. The corpus bursae contains two signa. The species should therefore be restored as Chorsia procrita Swinhoe, stat. rev., comb. n. A large male with similar facies from Sumatra had a male abdomen (slide 20841) with a massively modified eighth segment and much larger genitalia with an acute saccus, and more paddle‐like valves. The aedeagus is much broader than the ductus bursae of inordinata or procrita. It is probably a further, as yet undescribed species.

Geographical range

Borneo

Habitat preference

The holotype female (OUMNH: 1337) was taken in Sarawak by A.R. Wallace, probably in the lowlands. A further female was taken in lowland forest at the Busang Rekut river junction in the Barito Ulu of central Kalimantan. A male, worn, but matching the females in facies, was taken in lowland forest at 250m on the lower slopes of the limestone G. Api in Sarawak.

Taxonomic Note

In Part 13, p. 191, the Bornean taxon inordinata Walker (originally described in Acontia) was transferred from Hyperstrotia Hampson, where it was listed by Poole (1989), to Chorsia Walker. A formal account is presented here. Chorsia inordinata Walker (Plate 6, Figs 126, 127) Acontia inordinata Walker, [1863] 1884, J. Proc. Linn. Soc. (Zool), 7: 50. Diagnosis. The forewing facies is variegated in shades of grey and white with some rufous components, resembling maculosa Walker and griffini Holloway, but there is a distinctly trapezoidal but narrow dark grey bar posterior to the reniform, and the antemedial border to the medial dark zone is almost a right-angle where it gives way to the basal pale zone. The hindwing is a much darker grey than in the other two species. The male abdomen (slide 19578) has the eighth segment unmodified. The valves of the genitalia are tongue‐like with a subbasal, thumb‐like spur from the interior margin of the sacculus. The aedeagus vesica is globular, without ornamentation. The female genitalia have a broad ductus bursae, and the corpus bursae lacks signa. Taxonomic note. This species was transferred to Chorsia from Hyperstrotia Hampson in Part 13 as stated above, but not redescribed. Poole (1989) listed the N.E. Himalayan taxon procrita Swinhoe as a synonym of inordinata, as the forewing facies is similar. However, the part of the dark grey medial zone posterior to the reniform is centrally rufous rather than with a pale interior, and dark grey is more extensive in the marginal zone, especially along the submarginal, which has a more extensive rufous component; there is also a rufous streak running basad from the reniform. The male abdomen is similar to that of inordinata except the valves are relatively shorter and the processes from the sacculus are more robust, sinuous, tapering to an acute apex. The aedeagus is slightly narrower than in inordinata. The female has a very much narrower ductus bursae. The ostium is flanked, by a pair of oblique, sclerotised, conical pockets. The corpus bursae contains two signa. The species should therefore be restored as Chorsia procrita Swinhoe, stat. rev.,** comb. n**. A large male with similar facies from Sumatra had a male abdomen (slide 20841) with a massively modified eighth segment and much larger genitalia with an acute saccus, and more paddle‐like valves. The aedeagus is much broader than the ductus bursae of inordinata or procrita. It is probably a further, as yet undescribed species. Geographical range. Borneo Habitat preference. The holotype female (OUMNH: 1337) was taken in Sarawak by A.R. Wallace, probably in the lowlands. A further female was taken in lowland forest at the Busang Rekut river junction in the Barito Ulu of central Kalimantan. A male, worn, but matching the females in facies, was taken in lowland forest at 250m on the lower slopes of the limestone G. Api in Sarawak.

Genitalia: