Dexia monticola ( 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 : 57-59

Dexia monticola ( Malloch, 1935)

Eomyocera monticola Malloch, 1935: 587 .

Dexilla monticola: Crosskey 1967: 106 .

Dexi a monticola: Crosskey 1976: 179 . — Crosskey 1977: 603 (catalog).

Diagnosis. Thorax wholly black in ground color including postpronotal lobe and scutellum; tegula dark; legs reddish yellow; tibiae of male darkened basally and apically; abdomen with a wide longitudinal black median vitta.

Description. Body length. 13.1−13.9 mm.

Male. Head with yellowish white pruinosity, posterior half of gena, parafacial and lower occiput whitish; antenna and palpus reddish yellow. Frons 0.15−0.16 times as wide as head width; frontal vitta 1.5−2 times as wide as fronto-orbital plate at middle; parafacial 1.5−2.0 times as wide as 1st flagellomere at middle height; face well concave, lower margin weakly produced forward, facial carina high, pointed on ridge; gena about 0.4 times as wide as eye height. Inner vertical seta fine, slightly longer than 1/3 eye height; outer vertical seta fine hair-like; ocellar seta strong, 2 additional strong hairs present behind posterior ocelli; 10−14 frontal setae, lowest seta nearly level with base of antenna; fronto-orbital plate with several fine hairs in row of frontal setae; gena with fine hairs on lower portion; vibrissa nearly level with lower margin of face. Antenna falling short of lower margin of face by about twice length of pedicel, pedicel with a long seta which about 3 times as long as its own length; 1st flagellomere 3−4 times as long as pedicel. Total width of arista including plumosity about 4 times as wide as 1st flagellomere. Prementum about 3 times as long as wide; palpus about as long as antenna.

Thorax black in ground color, with rather dense grayish pruinosity on scutum, grayish white pruinosity on pleura; with 2 pairs of longitudinal black vittae on dorsum, outer vitta about twice as wide as inner one, inner vitta about 1/2 as wide as pruinose portion between inner and outer vittae; brownish pruinosity visible between inner and outer vittae; scutellum with gray pruinosity except dark base. All thoracic hairs black; postpronotal lobe with 2−3 setae standing in a straight line; 1 presutural and 2 postsutural acrostichal setae; 2 presutural and 3 postsutural dorsocentral setae; 2 postsutural intra-alar setae; 3 supra-alar setae, anterior one fine or posterior one slender; 2 katepisternal setae, katepisternum with dense long hairs. Wing hyaline, evenly tinged with pale brown; tegula and basicosta black; lower calypter pale brown. Costal spine 1.2−1.5 times as long as r-m crossvein; relative lengths of 2nd, 3rd and 4th costal sectors approximately 1:2:1; vein M from dm-cu crossvein to its bend about 4 times distance between the bend and wing margin, appendix about 1/2 as long as r–m crossvein. Lower calypter with long fringe on outer margin. Legs long, reddish yellow, tibiae darkened basally and distally; tarsi and claws black; pulvilli pale brown. Mid tibia with 2−3 posterodorsal setae; hind tibia with 2 anterodorsal, 2−3 posterodorsal and 2−3 ventral setae.

Abdomen broadly translucent yellow, black on mid dorsal longitudinal portion of syntergite 1+2 to tergite 5, anterior and posterior margins of syntergite 1+2, posterior 1/5−2/5 of tergites 3 and 4 and posterior 1/2 of tergite 5; rather dense whitish pruinosity on anterior 1/6 of tergites 3 and 4, and anterior 1/2 of tergite 5. Hairs on tergites dense, short, erect and black; syntergite 1+2 with 1−2 lateral marginal setae, without median marginal setae; tergite 3 with 2 pairs of strong median discal, 1 pair of strong median marginal and 2−3 lateral marginal setae; tergites 4 and 5 each with 2 pairs of strong median discal and a row of strong marginal setae, marginal setae on tergite 5 set forward on median portion.

Female. Frons narrowed posteriorly, about 1/3 head width; gena about 0.4 times as wide as eye height. Ocellar seta and inner vertical seta as strong as upper frontal setae and 2-3 times as long as outer vertical seta; 7 inclinate frontal setae; 2 proclinate orbital and 1 outclinate prevertical setae. Abdomen ovate, translucent yellow, black on middorsal depression and posterior margin of syntergite 1+2, posterior margin of tergite 3, posterior 3/4 of tergites 4 and 5; grayish white pruinosity on anterior margin of tergite 3, anterior 1/4 of tergites 4 and 5; tergites 3 to 5 without discal setae. Other characters almost same as in male.

Type material examined. Holotype male of Eomyocera monticola Malloch , MALAYSIA. N. Borneo [= Sabah], Mt. Kinabalu, Lumu , 5500 ft, 7.iv.1929, H.M. Pendlebury ( BMNH).

Additional material examined. CHINA. Guangdong: 1 female, Mt. Nanling, 700−1400 m, Ruyuan , 11−16.v.2005, C.-T. Zhang ( SNU) . INDONESIA. 1 female, Mt. Tjemere, 400−1400 m, Cirebon , Java, 19−25.xi.1973, Kano . MALAYSIA. 1 female, Mt. Beremban, 1100−1700 m, West Malaysia , 26.x.1975, H. Shima . 1 female, Mt. Brincuang, West Malaysia , 2300 m, 25.x.1975, H. Shima . 1 male, 3 females, Mt. Kinabalu, 1300−1800 m, Sabah, Boreno , 9−11.xi.1975, H. Shima and S. Shinonaga . 2 females, P. Head Q., 1600 m, Mt. Kinabaru , Sabah, 1−2.v.1979, H. Kurahashi . 1 female, Cameron Highlands, Mt. Jasar, West Malaysia , 2100 m, 26.x.1991, R. Kano, K. Inder Singh ( BLKU) . 2 females, Sabah: Kinabalu National Park, Headquarters area , 1560 m, 6,16. ix.1983, G.F. Hevel & W.E. Steiner ( USNM) .

Distribution. China *, Indonesia (Java)*, Mayalysia (Pen. Malaysia, Sabah).

Remarks. This species is similar to D. longipennis , but differs from it in having long fringe on the lower calypter, mid and hind tibiae brown or dark yellow, postpronotal lobe and scutellum dark brown, thoracic scutum and pleura with grayish white pruinosity, and abdominal tergites 3 and 4 each with 2 pairs of median discal setae.