Dexia vittata ( Baranov, 1932 )

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 : 76

Dexia vittata ( Baranov, 1932)

Sumatrodexia vittata Baranov, 1932: 215 . — Sabrosky & Crosskey 1969: 53.

Dexia vittata: Crosskey 1976: 179 . — Crosskey 1977: 604 (catalog).

Diagnosis. Thorax with 2 broad longitudinal black vittae; proepisternum with a few fine black hairs; 1 supraalar seta; lower calypter with short fringe; legs reddish yellow; abdomen with a dark brown triangular marking on each tergites.

Description. Body length. Male: 15.5 mm.

Male. Head with pale yellowish gray-white pruinosity; antenna reddish yellow; palpus yellow. Frons about 1/5 head width; frontal vitta slightly wider than fronto-orbital plate; parafacial nearly parallel-sided, about twice as wide as 1st flagellomere; facial carina developed, blunt on ridge, lower margin of face not produced forward; gena wide, about 0.53 times as wide as eye height. Inner vertical setae developed; outer vertical seta very fine; ocellar seta about 1/2 eye height; 8−10 frontal setae, lowest seta nearly level with base of antenna; fronto-orbital plate with only several fine hairs; gena with rather sparse hairs on posterior portion; vibrissa inserted slightly above level of lower margin of face. Antenna falling short of lower margin of face by about 3 times as long as pedicel; 1st flagellomere about 4.5 times as long as pedicel. Palpus subequal in length to 1st flagellomere.

Thorax black in ground color, postpronotal lobe, notopleural area and posterior margin of scutellum reddish, scutellum broadly brown-black; scutum covered with dense pale yellowish gray-white pruinosity, 2 broad longitudinal black vittae, posterior 1/2 of postsutural scutum with brownish pruinosity between vittae; pleura with rather thin grayish white pruinosity. Proepisternum with 1−2 fine black hairs; 2−3 postpronotal setae; 1 presutural and 2 postsutural acrostichal setae; 2 presutural and 3 postsutural dorsocentral setae; 1−2 postsutural intra-alar setae; 1 supra-alar seta; 2 katepisternal setae, katepisternum with rather dense hairs; discal scutellar seta very fine, about 2/3 as long as scutellum. Wing hyaline, tinged with pale brown on anterior and basal portion and along veins; tegula black, basicosta brown; lower calypter pale brown. Costal spine absent, relative lengths of 2nd, 3rd and 4th costal sectors approximately 2:4:2.5, vein M from dm-cu crossvein to its bend about 1.5 times distance between the bend and wing margin, appendix absent. Lower calypter with short fringe on outer margin. Legs reddish yellow, tibiae slightly darkened, tarsi and claws brown-black; pulvilli pale yellowish. Hind leg longest, hind femur and tibia long and the latter weakly sinuate beyond middle. Mid tibia with 2 posterodorsal setae; hind tibia with 4 anterodorsal setae, upper 3 fine, 1 posterodorsal and 1 ventral setae. Claw and pulvillus as long as tarsomere 5.

Abdomen reddish yellow, with broad black mid-dorsal longitudinal vitta from syntergite 1+2 to tergite 5; posterolateral portion of tergites 2 to 4 weakly darkened; very thin and silvery white pruinosity visible on dorsum of tergites 4 and 5, the pruinosity dense on side of tergite 5. Hairs black, rather sparse, long and recumbent, but erect and fine on tergite 5; syntergite 1+2 with 1 lateral discal and 1 lateral marginal setae, without median marginal setae; tergite 3 with 2 pairs of median discal, 1 pair of median marginal, 0−1 lateral discal, and 1 lateral marginal setae; tergites 4 and 5 each with 2−3 pairs of median discal and a row of marginal setae.

Female. Unknown.

Type material examined. Holotype male of Sumatrodexia vittata Baranov , INDONESIA, Java, Surabaja ( USNM) . Paratype 1 male, Java, Surabaja ( SMT) .

Additional material examined. INDONESIA. 1 male, Tasari, 6000−8000 ft, Java, Terry ( BPBM) .

Distribution. Indonesia (Java).

Remarks. This species is similar to D. montana in general appearance and is possibly conspecific. We retain it as a distinct species because of lack of information about the male terminalia.