Fustis sterlingi Fibiger

FIBIGER, MICHAEL, 2010, Revision of the Micronoctuidae (Lepidoptera: Noctuoidea) Part 3, Taxonomy of the Tactusinae, Zootaxa 2583 (1), pp. 1-119 : 44-45

Fustis sterlingi Fibiger , new species

( Plate 5 , figure 6; male genit. plate 14, figure 6; female genit. plate 24, figure 2)

Material examined. Holotype: male, China, Hong Kong Island, Stanley , St. Stephen’s Beach, 0 m, 1.vii.2000, leg. M. Sterling, genit. prep. 4585 M. Fibiger, coll. BMNH.

Paratypes: 1 male and 1 female. 1 male with data as holotype ; 1 female, China, Hong Kong Island, Turtle Cove Beach , 0 m, 20.i.2003, leg. M. Sterling, genit. prep. 5840 M. Fibiger. Colls R. Kendrick and MF .

Diagnosis. Imago (external). Wingspan: from 7.5–9.5 mm (apo.).

Head, patagia, anterior part of tegulae, prothorax, basal part of costa, and costal upper patch of medial area: black.

Forewing ground colour: in male light grey, except black in medial area; in female black brown, especially dark in medial area (apo.).

Abdomen: grey and dark grey, with dorsal tuft on basal segment.

Crosslines: all lines present, subterminal line weak.

Terminal line: marked by black interneural dots.

Reniform stigma: distinct, yellow, ovoid or narrowly ovoid, black outlined.

Hindwing: in male light grey, in female grey; with indistinct discal spot.

Underside: forewing grey; hindwing light grey, with indistinct discal spot.

Male genitalia. Tegumen: stout; dorsal one third totally fused, platelike (apo.).

Vinculum: two-branched; anterior one barlike; posterior one similar.

Saccus: short; broadly U-shaped.

Ampulla: narrowly ovoid, dorsal end slightly longer than ventral.

Digitus: small, platelike.

Anellus plate: prominently asymmetrical; heavily sclerotised; spatulate; apically free, club-shaped, with rounded processes (apo.).

Phallus: coecum short, apically rounded; broadest by ductus ejaculatorius; smoothly and heavily curved to tip.

Vesica: unarmed.

Female genitalia. Ovipositor: short; smoothly rounded posteriorly and at corners.

Posterior apophyses: same length as ovipositor.

Anterior apophyses: half length of posterior.

7 th and 8 th abdominal segment: fused throughout; right lateral side narrow, gradually becoming 4 times Antrum: short, as wide as long, conelike (apo.).

Ductus bursae: membranous, long and narrow, 3 times as long as corpus bursae.

Corpus bursae: globular.

Appendix bursae: arising posteriorly from ductus bursae.

Signum: cross shaped, longitudinal bar relatively long.

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

- smallsize;

- grey and black ground-colour, with contrasting wing pattern;

- large, yellow reniform stigma;

male genitalia, in

- tegumen dorsally with large plate;

- ampulla lobes almost straight, ovoid;

- anellus clublike, with rounded processes;

female genitalia, in

- wide ostium;

- short, conelike antrum.

Distribution. F. sterlingi known only from China, Hong Kong.

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.