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Ariola gracilis sp. n.


Ariola gracilis

10-12mm. Externally, this species appears inseparable from coelisigna, but can be clearly distinguished from the genitalia of both sexes. In the male, the squared uncus is narrower, the valves of more even width (not wider centrally) and obtusely angled centrally (the apical half flexed ventrally) rather than curved. The aedeagus vesica is narrow, tubular, and has a slender apical cornutus that is very much smaller than that of coelisigna. The grooves in the abdomen are less well developed, as mentioned in the diagnosis of coelisigna. The female genitalia have segments 8-10 rather deeper than in other species of the coelisigna group, and the ductus is much longer, slender, sclerotised, the ductus seminalis arising from it relatively basally. The bursa is large, pyriform, without a signum.

Holotype . SARAWAK: Gunong Mulu Nat. Park, R.G.S. Exped. 1977-8 (J.D.Holloway et al.), Site 2, January, Camp 4, Mulu, 1790m. 452463 [upper] montane (moss) forest, BM noctuid slide 17502.

Paratypes: 1 (slide 17498) general data as holotype but Site 15, February, Mulu, Camp 2.5, 1000m. 413461, lower montane forest; 1 (slide 17491) general data as holotype but Site 23, April. W. Melinau Gorge, 250m. 430558, FEG 4 limestone; 1G (slide 17512) Sandakan (Pryer & Cator); 1E (slide 17503) BRUNEI: 1618m, Bukit Retak, montane forest, 14.9.79 (Lt. Col. M.G. Allen); 1 (slide 17497) BRUNEI: Ulu Temburong, Gn. Pagon, 1700m, iv.1981 (I. Gauld).

Geographical range. Borneo, Peninsular Malaysia (slide 17511), Bali (slide 17513).

Habitat preference. This species is perhaps the least infrequent of the five in Borneo, and is recorded from the lowlands to 1790m, being slightly more frequent at altitude.

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