Dexia lepida Wiedemann, 1830

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 : 47-49

Dexia lepida Wiedemann, 1830

Figs. 57−60

Dexia lepida Wiedemann, 1830: 376 . — Wulp, 1896: 138 (catalog). — Crosskey, 1966: 662 (types). — Crosskey1976: 179 (catalog).

Diagnosis. Thorax with 1 presutural and 2 postsutural acrostichal setae; 3 presutural and 3 postsutural dorsocentral setae; and abdominal syntergite 1+2 with 1 pair of median marginal setae.

Description. Body length. Male: 9.2−12.8 mm.

Male. Head with dense pale yellowish white pruinosity, more yellowish on fronto-orbital plate; antenna reddish yellow, with brown arista; palpus reddish yellow. Frons 0.16 times as wide as head width; frontal vitta 1.5−2 times as wide as fronto-orbital plate at middle; parafacial slightly widened below, about twice as wide as 1st flagellomere at middle height; facial carina long and high, rather sharp at basal 1/2 and weakly flattened below, lower margin of face well warped forward; gena 0.40−0.44 times as wide as eye height. Inner vertical seta fine, less than 2/5 eye height; outer vertical seta still fine, hair-like, about 1/2 as long as inner seta; ocellar seta strong (missing in type specimen); 11−13 frontal setae, lowest seta nearly level with base of antenna; fronto-orbital plate with a few fine short hairs inside row of frontal setae; gena with very fine short hairs on lower portion; vibrissa inserted slightly above level of lower margin of face. Antenna falling short of lower margin of face by about 1/2 length of 1st flagellomere, latter about 5 times as long as pedicel; total width of arista including plumosity about 2.5 times as wide as 1st flagellomere. Prementum about 1/2 as long as eye height; palpus subequal in length to pedicel and 1st flagellomere combined.

Thorax black, with dense grayish white pruinosity on dorsum and yellowish gray pruinosity on pleura; 2 pairs of longitudinal brownish-black vittae, inner vittae narrow, a vitta about as wide as pruinose portion between inner and outer vittae on presutural scutum; scutellum dark brown on basal half. Hairs black; proepisternum bare; postpronotal lobe with 2 setae; 1 presutural and 2 postsutural acrostichal setae; 3 presutural and 3 postsutural dorsocentral setae; 2 postsutural intra-alar setae; 2 supra-alar setae; 2 katepisternal setae, katepsternum with 1−2 rows of hairs. Wing hyaline, faintly and evenly pale yellowish tinged; tegula reddish brown on basal 1/3 and brownish-black on apical portion; basicosta brownish black; lower calypter pale brownish, with long fringe on outer margin. Costal spine slightly longer than r-m crossvein; relative lengths of 2nd, 3rd and 4th costal sectors approximately 4.5:10.5:5.0; vein M from dm-cu crossvein to its bend about 3 times distance between the bend and wing margin, appendix short. Legs reddish yellow, tibiae darkened on basal and distal portions; tarsi black; claws brown, pulvilli pale brown. Mid tibia with 2 posterodorsal setae; hind tibia with 2 anterodorsal and 1−2 posterodorsal setae, without ventral seta. Claws and pulvilli long, fore claw and pulvillus slightly longer than tarsomere 5.

Abdomen long ovate, translucent yellow, blackish brown on mid dorsal longitudinal portion of syntergite 1+2 to tergite 4 (widened posteriorly on each tergite), posterior margin of syntergite 1+2, posterior 1/6−1/4 of tergite 3, posterior 1/3−2/5 of tergite 4 and entire tergite 5; tergites 3 and 4 with thin whitish pruinosity on narrow anterior margin, tergite 5 with rather dense pruinosity on anterior 1/4, the pruinosity expanded posteriorly to anterior 1/2 of side. Hairs dense and erect, long and black on scutum, very sparse on mid dorsal area of tergite 5; syntergite 1+2 with 1−2 pairs of median marginal and 1−2 lateral marginal setae; tergite 3 with 1−2 pairs of median discal, 1 pair of median marginal and 1 lateral marginal setae, anterior discal setae rather fine; tergite 4 with 2 pairs of median discal and a row of marginal setae; tergite 5 with 2−4 discal and a row of marginal setae. Male terminalia. Sternite 5 triangular, V-shaped median cleft deep, about 2/3 length of the sternite, posterior lobe blunt apically; cerci slender on apical 1/2 and pointed apically; surstylus long and bluntly rounded, narrowed at apex; postgonite slightly shorter than basiphallus; distiphallus long, plate-like.

Female. Unknown.

Type material examined. Lectotype male of Dexia lepida Wiedemann (designated by Crosskey 1966: 662), INDONESIA, Kuhr , Java . Paralectotype male of Dexia lepida Wiedemann , no data ( RMNH) .

Additional material examined. INDONESIA. 1 male, Puncak , 1300 m, Java, 14−15.xi.1973, H. Kurahashi ( BLKU) . 2 males, Goanoanc Gadeh , Java, iii.1911, E. Jacobscon ( ZMUA) .

Distribution. Indonesia (Java).

Remarks. This species resembles D. subnuda , but differs from it in having 2 pairs of longitudinal brownish-black vittae, 1 presutural and 2 postsutural acrostichal setae, 3 presutural and 3 postsutural dorsocentral setae, and abdominal syntergite 1+2 with 1 pair of median marginal setae.