Fustis malaysiensis Fibiger

FIBIGER, MICHAEL, 2010, Revision of the Micronoctuidae (Lepidoptera: Noctuoidea) Part 3, Taxonomy of the Tactusinae, Zootaxa 2583 (1), pp. 1-119 : 45-46

Fustis malaysiensis Fibiger , new species

( Plate 5 , figure 7; male genit. plate 15, figure 1)

Material examined. Holotype: male, W Malaysia, Trengganu , Pulau Teenggol, 19.viii.1993, leg. G.S. Robinson, genit. prep. 3732 M. Fibiger, coll. BMNH.

Diagnosis. Imago (external). Wingspan: 8 mm.

Medial costal patch: trapezoid.

Forewing ground colour: yellow brown; basal, costal quadrangular patch, and terminal area, including fringes black (apo.).

Crosslines: indistinct, except terminal line indicated by black interneural dots.

Reniform stigma: visible, though indistinct, beige.

Hindwing: grey.

Underside: forewing brownish grey, hindwing grey.

Male genitalia. 7 th sternite: long, triangular, apically fingerlike; subbasally with small triangular processes (apo.).

Tegumen: long, laterally narrow; dorsally broad, narrow platelike.

Vinculum: two-branched; centre one barlike; posterior one branchlike, strongly curved (apo.).

Ampulla: bilobed; slightly asymmetrical; dorsal lobe larger, clublike; lobe in extension to valva curved, tapered towards tip (apo.)

Digitus: small, humplike.

Juxta: much wider than high, laterally pointed.

Anellus plate: asymmetrical, spatulate, medially with heavily sclerotised brushlike structure, streak of brushey hairs longer on left (apo.).

Phallus: coecum triangular, medially coiled upwards, subapically strongly curved.

Female genitalia. Unknown.

Differential diagnosis. F. malaysiensis differs from other Fustis species in:

- small size, similar to that of F. sterlingi ;

- shape of ampulla, especially dorsal clublike arm; and

- long streak of brushlike setae on left side of anellus.

Distribution. F. malaysiensis known only from West Malaysia.

Figures

PLATE 5. Figures 1–8. Dignus, Vas, Nilgerides, and Fustis species, adults. 1, Tumula flavicollis, female holotype, Thailand N, Fang; 2, D. buchsbaumi, female holotype, Indonesia, Lombok; 3, Vas owadai, female holotype, Thailand N, Chiang Mai; 4, V. proceus, female holotype, Vietnam N, Da Lat; 5, Nilgirdes trifasciata, female holotype, Indonesia, Sumatra; 6, Fustis sterlingi, male holotype, China, Hong Hong, and female paratype, with same data; 7, F. malaysiensis, male holotype, Malaysia W, Trengganu; 8, F. parasensora, male holotype, Laos S, Sayaboury.