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Idaea themeropis West
Eois themeropis West, 1930, Novit. zool., 35: 257.
Sterrha themeropis obrepta Prout, 1938, Gross-Schmett. Erde, 12: 228.
Idaea themeropis West; Holloway, 1976: 65.

Idaea themeropis (x 1.16)

Idaea themeropis (x 1.16)

Diagnosis. This is one of the largest Bornean species, a somewhat greyish fawn, with the oblique forewing medial usually, but variably prominently darker, as is the hindwing medial. Smaller specimens could be confused with I. sakuraii, and dissection is recommended, though the male hind-tibial pencil is larger, a paler brown.

Taxonomic notes. Specimens from higher altitudes on G. Kinabalu (Radio Sabah site at 2600m) are significantly larger (14mm on average, compared with 10mm or below) than those from lower altitudes and from other Bornean mountains: typical Philippines material is also about 10mm on average. These larger specimens also tend to be greyer and more heavily marked, especially the medial fasciae. Both forms are illustrated above. Instances of distinct, large high altitude, sister-species endemic to Kinabalu of more widely distributed species at lower elevations are seen in Garaeus Moore and Apophyga Warren in the Ennominae (Holloway, 1993[4]) and in several genera of the Larentiinae (Hypocometa clauda Warren, Poecilasthena character Prout stat. rev., Papuarisme lagadani sp. n.). However the male genitalia of high and low forms of themeropis in Borneo share the unusually strongly falcate ventral margin of the valve cucullus that is not seen in typical themeropis where the apex of the valve is more paddle-shaped. The male second sternite is rugose within a slight pouch. The female genitalia have a reduced but elongate bursa, immaculate, but with a broad zone near the ostium more strongly sclerotised and with a short diverticulum.

Geographical range. Philippines; Borneo (ssp. obrepta).

Habitat preference. The species is found over an altitude range from about 1700m to 2600m, the higher elevations being attained on G. Kinabalu. The species has also been recorded from Bukit Monkobo in Sabah and G. Mulu in Sarawak.

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