Lankabanus attenuatus, VIRAKTAMATH & WEBB & YESHWANTH, 2025

Lankabanus attenuatus sp. nov.

Figs 2A–D View FIGURES 2 , 8 View FIGURES 8 JK, 11D, 12I–L, 21A–I, 57N–Q

Diagnosis. Markings on head, pronotum, mesonotum and forewings distinguish this species from other species of Monobazus group of genera, in addition to the male genitalia characters: male pygofer with ventral process blade-like, apex attenuated; style apophysis with apex broad, somewhat bilobed, aedeagus without processes, somewhat S-shaped in lateral view, shaft broadest in basal 0.33 then narrowed, extending beyond dorsal gonopore, strongly ventrally recurved in lateral view, apex attenuated.

Description. Creamy white, crown with one small spot near fore margin and prominent inverted J-shaped reddish brown to dark brown spot (sometimes incomplete) on either side of median line in basal half touching posterior margin, area between these spots in basal half orange. Eyes greyish brown. Face with area at base of antennae, inner margins of frontoclypeus and basal spot on either side of clypellus, orange brown. Pronotum with one oblique stripe on either side of median line, sometimes confluent anteriorly on median line extending to posterior margin and continuous with basal triangles of exposed mesonotum, orange brown to rusty brown, apices of basal triangles of mesonotum dark brown. Forewing with area between claval veins along claval commissure, one stripe bordering outer margin of claval suture, orange yellow; one spot at apex of inner claval vein, apex of clavus, one elongate prominent spot on corium at level with midlength of claval suture, broad prominent spot on apex of vein reaching costal margin from outer apical cell and one oblique stripe arising from apex of clavus and reaching costa before apical margin on costa, dark brown, some veins in apical half of forewing brown. Thoracic and abdominal tergites, sternites and legs creamy white, fore tibiae brown.

Crown about as long as breadth between eyes, subconically rounded. Pronotum about 1.8–1.9× as wide as long medially.

Male genitalia. Pygofer in lateral view longer than height, posteriorly conically rounded, with basiventral process closely following ventral margin and apex attenuated. Style apophysis distally widened, apical margin slightly concave. Aedeagus with short preatrium, shaft broad in basal 0.33 then narrowed, distal 0.33 curved ventrally, without processes.

Female genitalia. As in generic description.

Measurements. Male 4.3–4.4mm long, 1.0mm wide across eyes and 1.0– 1.1mm wide across posterolateral angles of pronotum. Female 4.9 mm long, 1.1 mm wide across eyes and also across posterolateral angles of pronotum.

Material examined. HOLOTYPE ♂, SRI LANKA: Rat. Dist. , Gilimale Lumber Mill, 115ft, black light, 20–25 October 1976, collected by: G.F. Hevel, R.F. Dietz IV, S. Karunaratne, D.W. Balasooriya ( USNM) . PARATYPES, 3♂, 2♀, data as in holotype ( UASB, USNM) .

Etymology. The specific epithet is the Latin participle attenuatus, -a, -um (= thinned, lessened, attenuated), referring to the tapered aedeagal shaft.