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Hypochrosis hyadaria Guenée  
Hypochrosis hyadaria Guenée, 1857, Hist. Nat. Insectes, Spec. gen. Lep., 10:537.
Marcala ignivorata Walker, 1862, List Specimens lepid. Insects Colln Br. Mus., 26: 1764.
Oxydia korndoerfferi Snellen, 1877, Tijdschr. Ent., 20: 73, syn. n.
Marcala obliquaria Moore, 1888, Descr. new Indian lepid. Insects Colln. Atkinson, p.232.
Hypochrosis annulata Pagenstecher, 1896, Ent. Nachr., 22: 52, syn. n.
Omiza columbaris Warren, 1896, Novit. zool. 3: 417, syn. n.
Omiza subaurantiaca Warren, 1896, Novit. zool., 3: 417, syn. n.
Omiza lubricata Warren, 1809, Novit. zool., 6: 65, syn. n.
Hypochrosis hiresia Swinhoe, 1901, Ann. Mag. nat. Hist. (7) 8:125, syn. n.
Hypochrosis tinctaria bebaea Prout, 1932, J. fed. Malay States Mus., 17: 84.
Hypochrosis hyadaria bebaea Prout; Holloway, 1976: 76.

Hypochrosis hyadaria

This species is a warm pale grey with a pale greenish tinge medially on the forewing. Both wings are finely and lightly striated with darker brown grey. The fasciation and discal markings resemble those of Heterolocha species but are more sharply defined, with the forewing antemedial more oblique, not quite parallel to the postmedial.

Taxonomic notes. H. hyadaria belongs to a complex of species that are very similar in wing pattern but can be separated reliably on characters of the male genitalia. These are also used to bring together a number of taxa as synonyms of hyadaria though some could merit subspecific status as noted below. In hyadaria the apical process of the valve costa is very small, and the furca is very reduced, only the left arm being present and small. H. chlorozonaria Walker (= sulphurescens Moore, galbulata Felder) from Sri Lanka has similar genitalia but with a narrower valve and a much longer, slender left arm to the furca. H. abstractaria Walker (= tinctaria Walker, irrorata Moore) has more elongate genitalia with a long, slender, dilated process to the valve costa; the species flies in the N.E. Himalaya, Burma and Thailand.

Geographical range. India through S.E. Asia; Borneo (ssp. bebaea); Sumatra, Java, Bali (ssp. korndoerfferi stat. n. = columbaris); Flores, Sumbawa (ssp. lubricata stat. n.), Timor (ssp. subaurantiaca stat. n.); Philippines, Sulawesi (ssp. annulata stat. n.)

Habitat preference. On G. Kinabalu the species was taken in abundance at stations between 1000m and 1930m, with a singleton at 2110m. During the Mulu survey three specimens were taken in upper montane forest (1780m).

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