Dexia fraseri ( Malloch, 1935 )

Zhang, Chun-Tian, Shima, Hiroshi & Chen, Xiao-Lin, 2010, A review of the genus Dexia Meigen in the Palearctic and Oriental Regions (Diptera: Tachinidae) 2705, Zootaxa 2705, pp. 1-81 : 36

Dexia fraseri ( Malloch, 1935)

Eomyocera fraseri Malloch, 1935: 587 .

Dexilla fraseri: Crosskey 1967: 106 .

Dexia fraseri: Crosskey 1976: 178 . — Crosskey 1977: 602 (catalog).

Diagnosis. 1st flagellomere 3−4 times as long as pedicel; 2 presutural and 3 postsutural dorsocentral setae; 3 katepisternal setae; legs reddish yellow.

Description. Body length. Female: 14.0− 14.6 mm.

Female. Head with densely white pruinosity; antenna and palpus yellow. Frons about 0.28 times as wide as head width; frontal vitta slightly narrower than fronto-orbital plate at middle; parafacial nearly parallelsided, about 3 times as wide as 1st flagellomere at middle height; facial carina arched in lateral view, ridge rather blunt, longer than antenna; lower margin of face protruding forward; gena about 0.48 times as wide as eye height. Inner vertical seta about 2/3 as long as eye height; outer vertical seta about 1/2 length of inner vertical seta; ocellar seta about 3/4 as long as inner vertical seta; prevertical seta subequal in length to ocellar seta; 2 proclinate orbital setae, anterior seta slightly longer than inner vertical seta; fronto-orbital plate with a few fine hairs; gena with some very short fine hairs on anteroventral portion and longer hairs on posteroventral portion; vibrissa inserted nearly level with lower margin of face. Antenna falling short of lower margin of face by slightly less than length of pedicel; 1st flagellomere 3−4 times as long as pedicel; total width of arista including plumosity about 4 times as wide as 1st flagellomere. Prementum slightly longer than 1/2 eye height; palpus subequal in length to pedicel and 1st flagellomere combined.

Thorax dark brown on median portion of scutum in ground color, broadly pale brownish on postprontal lobe, lateral area of scutum, posterior portion of scutellum and pleura; scutum with rather dense pale yellowish white pruinosity and 4 longitudinal black vittae, an inner vitta distinctly narrower than outer vitta on presutural area but almost subequal on postsutural scutum; pleura with more whitish pruinosity. Hairs black; postpronotal lobe with 4 setae, 3 basal setae standing in a triangle; 1 presutural and 2 postsutural acrostichal setae; 2 presutural and 3 postsutural dorsocentral setae; 2 postsutural intra-alar setae; 3 supra-alar setae; 3 katepisternal setae. Wing weakly tinged with pale brown, rather strongly tinged along veins and anterior portion; tegula reddish brown; basicosta brown; lower calypter pale brown. Costal spine slightly longer than rm crossvein; relative lengths of 2nd, 3rd and 4th costal sectors approximately 4.5:11:5; vein M from dm-cu crossvein to its bend about 4 times distance between the bend and wing margin, appendix short. Lower calypter with short fringe. Legs reddish yellow. Mid tibia with 2 posterodorsal setae; hind tibia with 2 anterodorsal, 2 posterodorsal and 2 ventral (upper one fine) setae. Claws and pulvilli shorter than tarsomere 5.

Abdomen reddish yellow in ground color, dark brown on mid dorsal longitudinal portion of syntergite 1+2 to tergite 5, posterior 1/4 of tergite 3 and 1/3 of tergite 4, with dense pale yellowish pruinosity on anterior 1/5 of tergite 3 and entire tergites 4 and 5, the pruinosity thin and with shifting appearance on posterior 1/4−1/ 5 of tergites 4 and 5. Hairs short fine dense and recumbent; discal setae absent; syntergite 1+2 without median marginal setae, with 1 lateral marginal seta; tergite 3 with 1 pair of median marginal and 1 lateral marginal setae; tergites 4 and 5 each with a row of marginal setae.

Type material examined. Holotype female of Eomyocera fraseri Malloch , MALAYSIA, Malay Peninsula, Pahang, Fraser’s Hill , 4200 ft, 5.vii.1931 ( BMNH).

Distribution. Malaysia (Pen. Malaysia).

Remarks. This species appears to be close to D. rustica , but differs from it by 1st flagellomere 3−4 times as long as pedicel, 2 presutural and 3 postsutural dorsocentral setae, and postpronotal lobe reddish in ground color. The male of this species is still unknown.