Allometopon pulcher Sasakawa, 1993

Owen Lonsdale, 2016, Revision of the genus Allometopon Kertész (Diptera: Clusiidae), Zootaxa 4106 (1), pp. 1-127 : 54-55

Allometopon pulcher Sasakawa, 1993

Figs 229–233

Allometopon pulcher Sasakawa, 1993: 3, 2009: 48 .

Description. General: ( Figs 229, 230 ) Body length 3.9mm. Arista pubescent. M1+2 ratio 2.7. First flagellomere reniform, more broadly lobate ventrally. Clypeus relatively stout.

Chaetotaxy: Four fronto-orbital setae (anterior seta slightly shorter). Ocellar seta approximately 1.5 times length of tubercle. Postvertical seta minute. Interfrontal seta small. First flagellomere along margin below arista with anteroventral hairs longer than width of base of arista. Anterior dorsocentral seta half length of posterior dorsocentral; closely set posteriorly. Acrostichal seta present. Two strong lateral scutellar setae arranged nearly transversely.

Colour—male: Setae brown to dark brown. Head mostly yellow, whitish below antenna; first flagellomere and apex to distal half of palpus brown to black; frons orange in non-type excluding parts of orbital plate and posterolaterally around vertical setae; ocellar tubercle yellow to brownish medially; gena and anterior half of postgena silvery tomentose. Scutum mostly yellow with pointed central stripe nearly attaining anterior margin, and with narrower stripe from alar base onto entire notopleuron and narrowly around and onto dorsum of postpronotum; with narrow, curved postsutural intra-alar stripe confluent with medial stripe along posterior margin. Scutellum brown. Metanotum yellow with light dorsal spot on anatergite. Pleuron and legs light yellow to whitish, with fore tarsus brownish and hind tibia light brown medially. Wing clear to slightly clouded. Halter white. Abdomen yellow with broad medial stripe posteriorly on tergite 2 and on tergites 3–5 (tapering anteriorly on each tergite).

Colour—female: Female as described for male except as follows: palpus entirely black; fore coxa, outer face of mid coxa, fore femur, fore tibia, fore tarsus, mid femur and distal half of hind femur dark brown, mid and hind tibiae brown to light brown and hind tarsus light brown; mid tarsi missing.

Male terminalia: ( Figs 231–233 ) Annulus well-developed with spiracle enclosed. Epandrium relatively long and narrow, with apex slightly constricted. Cercus small, shallow. Surstylus short, acute, curved inwards and posteriorly at apex, and with one apical tubercle. Ventral lobe of hypandrium very short with two small apical setae; arm of hypandrium broad apically, directed posteriorly. Phallapodeme well-developed, rod-like. Pregonite subrectangular with numerous distal setulae. Postgonite very long and narrow. Basiphallus well-developed. Epiphallus extremely long. Distiphallus 2/5 length of phallapodeme. Paraphallus hooked and dorsally spinulose with base wide and poorly-sclerotized (base with thin process); weak basal sclerite present (similar to Sobarocephala ).

Female terminalia: Not dissected.

Distribution: Indonesia (W. Kalimantan), Malaysia ( Malaya, Borneo).

Holotype: MALAYSIA. Singapore, Bt. Timah Nat. Res., 23.i.1990, J.R. Vockeroth (1♂, CNC).

Paratypes examined: MALAYSIA. North Borneo (SE), Forest camp, 19km N of Kalabakan, 4.xi.1962, K.J. Kuncheria (1♂, BPBM), 60m, 25.x.1962 (1♂, BPBM), 9.xi.1962 (1♀, BPBM).

Additional material examined: INDONESIA. W. Kalimantan, Gunung Palung Nat. Pk., 15.vi–15.viii.1991, Darling, Rosichon, Sutrisno (1♂, ROME).

Comments: Allometopon pulcher is a relatively large, robust-bodied species in the A. palpale group, differentiated from the rest of the group by a strong medial stripe between the dorsocentral rows, a brown notopleuron and an entirely black female palpus, as well as a black first flagellomere and four fronto-orbitals, which are seen in a few other species.

Figures

FIGURES 229 – 233. Allometopon pulcher Sasakawa; 229: holotype, photo, dorsal; 230: same, lateral; 231: non-type external genitalia, left lateral; 232: same, posterior; 233: internal genitalia, left lateral.