Crossopalpus exul ( Osten-Sacken, 1882 )

Grootaert, Patrick & Shamshev, Igor V., 2012, The fast-running flies (Diptera, Hybotidae, Tachydromiinae) of Singapore and adjacent regions, European Journal of Taxonomy 5, pp. 1-162 : 48-49

Crossopalpus exul ( Osten-Sacken, 1882)

Elaphropeza exul Osten-Sacken, 1882: 113 . Crossopalpus exul Shamshev & Grootaert, 2007: 162 .

Diagnosis

Antenna and palpus brown; anepisternum largely shining; scutum evenly covered with short pale hairlike setulae; legs almost uniformly dusky yellow.

Re-description

Female

LENGTH. Body 2.2 mm.

HEAD. Occiput black, densely greyish pollinose. Ocellar tubercle with 1 pair of short thin bristles. One pair of short vertical bristles present. Antenna entirely brown; pedicel with circlet of subequally short setulae and 1 long seta beneath; postpedicel 1.5 times longer than wide; stylus subapical, normally pubescent, brown, very long, 7.4 times longer than postpedicel. Gena greatly produced. Proboscis brownish yellow. Palpus brown, small, rounded.

THORAX. Uniformly black, with pleura almost entirely shining, large bristles black; katepisternum (= sternopleuron) narrowly along lower margin and suture with meron (= hypopleuron) tomentose, anepisternum (= mesopleuron) and meron with small tomentose patch in lower part, scutellum and metanotum entirely tomentose. Prothoracic episternum with 1 long yellow upturned bristle just above fore coxa. Postpronotal bristle not prominent. Mesonotum with 2 notopleurals, 1 postsutural supra-alar, 1 postalar and 6 scutellars (1 pair long, 2 pairs short thin); scutum evenly covered with short pale hairlike setulae but at least 3 pairs (scutum partly obscured by pin) of moderately long dorsocentral bristles present.

LEGS. (one hind leg missing) Almost uniformly dusky yellow, fore tibia rather brownish yellow. Coxae and trochanters with unmodified setation. Fore femur with inconspicuous setation, finely pubescent ventrally. Fore tibia lacking prominent bristles (except subapicals). Mid femur with 1 anterior subapical bristle, finely pubescent ventrally. Mid tibia lacking prominent bristles (except subapicals). Hind femur with inconspicuous setation, finely pubescent ventrally. Hind tibia with 2 black, short, closely set, subapical bristles; apical projection prominent, subtriangular, elongate, clothed in dense brownish setulae. Hind tarsomere 1 somewhat thickened.

WING. (one wing missing, another partly shrunken) Normally developed, finely uniformly infuscate, covered with uniform microtrichia; veins brownish. Costal vein with short setulae along anterior margin. Costal bristle long, brown. Costal section between R 1 and R 2+3 nearly as long as between R 2+3 and R 4+5. Vein Rs shorter than crossvein bm-cu. R 2+3 meeting costa beyond middle of wing. Crossvein bm-cu oblique. Crossvein r-m somewhat beyond middle of cell bm. Halter pale.

ABDOMEN. Brownish, covered with short, intermixed, pale and dark bristly hairs; apical segments upturned. Cercus brownish.

Male Unknown.

Material examined

♀, Philippinen [hand-written]; 349; Elaphropeza exul O. S. / Type [hand-written by Osten-Saken]; coll. Oldenberg; Holotypus [red]; Typus [dark red, crossed] (Deutsches entomologisches Institut, Müncheberg, Germany).

Distribution

Philippines.

Habitat and seasonal occurrence

No data.

Remarks

Shamshev & Grootaert (2007) have already indicated that this species actually belongs to the genus Crossopalpus . Here we present a re-description of C. exul that is based on examination of the holotype. Currently, this species is known only after the holotype.