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“Eilema” costalboides sp. n. 

"Eilema" costalboides
(x 1.32)

9mm, 12mm. The forewings are narrow, dark grey except for the costa which is finely lined whitish. The hindwings are also dark grey. The species shares several distinctive features with "E". costalba Wileman (Philippines: Luzon, also montane): assuming forewing vein M2 is lost, the radial sector branching system includes R3, R4, R5 and M1, R4 and R5 forming the terminal bifurcation rather than R3 and R4 as in most Eilema; the tegumen is slight and the uncus slender, fused to the scaphium; the aedeagus vesica contains two rows of spines (and other additional groups in costalba), but costalba is a larger species with the dorsal half of the hindwing paler grey than the rest. The valves of the male genitalia have a much sharper saccular process and an additional costal one apically in costalba. Females of costalba are not known; that of costalboides has a narrow ductus and a small but generally scobinate bursa as illustrated.

Holotype  SABAH: Mt. Kinabalu, 30.vii-3.viii. 1979 (E.W. Classey), BM arctiid slide 4896.

Paratypes: 1 SABAH: Mt. Kinabalu, 5500ft., 17-19.i.1976 (E.W. Classey), BM arctiid slide 5403; 1 SARAWAK: Gunong Mulu Nat. Park, R.G.S. Exped. 1977-8 (J.D. Holloway et al.), Site 14, February, Camp 2.5, Mulu, 1000m. 413461, lower montane for.; 1 (slide 5474) as previous but Site 25. April, G. Api, 900m, 427550, lower montane for.; 1 MALAYSIA: Sabah: 1km S. Kundasang, el. 1530m, 24 Aug. 1983 (G.F. Hevel & W.E. Steiner), in USNM; 1 MALAYSIA: Sabah: 25km N. Tambunan, 2 Sept. 1983, el. 1500m. at blacklight (G.F. Hevel & W.E. Steiner), in USNM.

Geographical range. Borneo.

Habitat preference. The type material is from montane forest at about 1500-1600m on G. Kinabalu or just to the south in the Crocker Range, and at slightly lower altitudes in the G. Mulu area.

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