Dexia seticincta Mesnil 1980

Dexia (Eomyocera) seticincta Mesnil, 1980: 46. — Herting 1984: 144 (catalog). — Shima 1989: 869 (list). — Herting & Dely-Draskovits 1993: 366 (catalog).

Diagnosis. Thorax with 4 narrow longitudianl vittae on dorsum; 3 presutural and 4 postsutural dorsocentral setae; lower calypter with long fringe; legs reddish yellow; abdominal tergite 3 with a complete row of marginal setae.

Description. Mesnil (1980) described this species in detail. Here are added some diagnostic characters.

Body length. Male: 9.0 mm.

Male. Head. Frons about 0.15 times as wide as head width; parafacial about twice as wide as 1st flagellomere at middle height; gena about 0.47 times as wide as eye height. Inner vertical seta about 3/8 as long as eye height; ocellar seta more than 1/2 eye height. 1st flagellomere about 5 times as long as pedicel; palpus slightly longer than 1st flagellomere. Thorax black in ground color, with 4 longitudinal black vittae, inner vitta about 1/5 as wide as pruinose portion between inner and outer vittae on presutural scutum. Proepisternum bare; 3 postpronotal setae; 2 presutural and 1 postsutural acrostichal setae; 3 presutural and 4 postsutural dorsocentral setae; 2 postsutural intra-alar setae; 2 supra-alar setae; 2 katepisternal setae; scutellum with 4 pairs of marginal setae. Wing hyaline; tegula and basicosta pale reddish brown. Costal spine about as long as r-m crossvein; relative lengths of 2nd, 3rd and 4th costal sectors approximately 2:4.5:2.5; vein M from dm-cu crossvein to its bend about twice distance between the bend and wing margin. Lower calypter with long fringe on outer margin. Legs reddish yellow. Mid tibia with 2 posterodorsal setae; hind tibia with 3 anterodorsal, 2 posterodorsal and 1 ventral setae. Abdomen broadly reddish yellow on sides of tergites 2 to 4, narrowly reddish brown on sides of tergite 5, broadly blackish on median longitudinal portion of tergites 2 to 4 and posterior 1/2 of tergite 4 and entire tergite 5; anterior 1/3 of tergite 3 and anterior 1/2 of tergites 4 and 5 with rather dense white pruinosity. Syntergite 1+2 with several lateral discal and 2−3 lateral marginal setae, without median marginal setae; tergite 3 with 2 pairs of median discal, 1−2 lateral discal and a row of marginal setae; tergite 4 with 2 anterior and an irregular row of 6 posterior discal setae and a row of marginal setae; tergite 5 with an irregular row of discal setae and a row of strong marginal setae.

Type material examined. Holotype male of Dexia seticincta Mesnil, JAPAN, Tokyo, Tanashinojo, 20.v.1951, I. Hattori (CNC).

Distribution. Japan (Honshu).

Remarks. This species is similar to D. ventralis, but is distinguished from it in having 3 presutural and 4 postsutural dorsocentral setae, and abdominal tergite 3 with a complete row of marginal setae.