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Rivula faircloughi sp. n.

Rivula faircloughi
Figure 7
Figure 16

8-9mm. This and the next species have the coloration of species such as bioculalis, the darker suffusion of the forewing discal area seen in the generic type species and sordida, and the punctate white fasciation of leucosticta Swinhoe and allies. The ground colour is an ochreous fawn, the forewings with a darker brown discal spot with its darker shade extending and broadening to the costa and also curving posteriorly and basally to the dorsum. White spotting discally and marginally is weak, but the antemedial and postmedial are clearly defined, the former more zigzag than in leucosticta but the latter following a very similar course with two bulges distad in the discal zone. The hindwings are a darker brown towards the margin. The male abdomen has a strongly modified sixth sternite, with some slight extension to the sternites on each side, the seventh being almost twice as long as the other two. The genitalia have long, distally tapering valves that extend to the tip of the uncus. The valve bases form a pair of pockets just dorsal to the short saccus. The juxta is an elongate plate with a narrow longitudinal ridge centrally, with a transtilla-like structure dorsal to it. The aedeagus vesica is complex, with both coarse and fine scobination.

Holotype . BRUNEI: 3m, Mumong, secondary and coastal veg., 28.12.1979 (R. Fairclough).

Paratypes: 1 BRUNEI: Anduki, 7.1.1980 (R. Fairclough); 1 (slide 20271) BRUNEI: 3m, Seria, secondary and coastal veg., 30.12.79 (Lt. Col. M.G. Allen); 1 BRUNEI: Telesai, 10m, 13.ii.1982 (T.W. Harman).

Geographical range. Borneo.

Habitat preference. Three specimens are from disturbed forest on the coast of Brunei; the fourth is from dry heath forest just inland.

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