Fustis Fibiger, 2010

FIBIGER, MICHAEL, 2010, Revision of the Micronoctuidae (Lepidoptera: Noctuoidea) Part 3, Taxonomy of the Tactusinae, Zootaxa 2583 (1), pp. 1-119 : 43

Genus Fustis Fibiger , new genus

Type-species: Fustis sensora Fibiger , new species.

Taxonomic notes. There are nine known species of Fustis . The genitalia indicate relationship with the following genus, Longiantrum . The genus is characterised by several unique features.

Diagnosis. Imago (external). Wingspan: from 7.5–14.5 mm; type-species 11 mm.

Labial palps: porrect; second segment beige, roughly scaled vertically; third segment 1: 3.5 of second, narrow, beige.

Head, patagia, anterior part of tegulae, prothorax, basal part of costa, and costal patch of medial area: black; costal medial area triangular in most species, including type-species; three species with quadrangular patch.

Forewing ground colour: yellowish white (including type-species), light brown to dark brown, suffused with black scales; fringes brown or dark grey.

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

Crosslines: usually absent, including in type-species, except in three species.

Terminal line: marked by black interneural dots.

Reniform stigma: distinct, yellow, round or ovoid, black outlined (apo.).

Hindwing: grey, with indistinct discal spot.

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

Male genitalia. Tegumen: long, laterally narrow, dorso-laterally (type-species) or dorsally broad, platelike (apo.).

Vinculum: more or less (type-species) two-branched; centre one barlike; posterior one branch like, often curved (apo.).

Saccus: short, broadly V or U shaped.

Valvae: slightly asymmetrical.

Clasper: barlike, oblique to valva margins.

Ampulla: bilobed, slightly asymmetrical, lobes hammerheadlike or clublike, tapered towards ventral and dorsal tips (apo.)

Digitus: small, humplike.

Juxta: often trapezoid, with medial narrow cleft on dorsal and ventral side (apo.).

Anellus plate: prominently asymmetrical; spatulate; medially with apically free, heavily sclerotised brushlike structure or processes (apo.).

Phallus: coecum short, triangular, broadest by ductus ejaculatorius, smoothly and strongly curved to tip.

Vesica: with a platelike cornutus (apo.).

Female genitalia. Described below under single species where both sexes are known, Fustis sterlingi , new species.

Distribution. Species of Fustis known from a large area of SE Asia, including SW China ( Hong Kong).