Siphona ( Aphantorhaphopsis ) laboriosa Mesnil, 1957

Siphona ( Aphantorhaphopsis) laboriosa Mesnil, 1957 View in CoL

( Figs 20–24 View Figs 20–24 , 90 View Figs 86–91 )

Siphona ( Asiphona) laboriosa Mesnil, 1957: 48 View in CoL . Type locality: Myanmar [ Burma], Kambaiti.

Ceromya laboriosa View in CoL : CROSSKEY (1976: 212), CROSSKEY (1977: 644).

Siphona ( Aphantorhaphopsis) laboriosa View in CoL : O’HARA (1989: 96), O’HARA et al. (2020: 798).

Type material examined. HOLOTYPE: J ( ZMU), N.E. Burma / Kambaiti , 7000 ft / 30.IV.1934 / R. Malaise.

Additional material examined. 26 JJ 2 ♀♀ ( SMNH), same locality as holotype, 7, 15, 26.iv., 7–17.v., 1–22.vi.1934, R. Malaise.

Diagnosis. Fronto-orbital plate with brownish pruinosity; 3 postsutural dorsocentral setae; abdomen without pruinosity.

This species is similar to S. ( A.) selangor in general appearance, but is easily distinguished from it by brownish pruinose fronto-orbital plate (yellow pruinosity in S. selangor ).

Redescription. Body length 3.5–4.8 mm. Male. Head with pale yellowish white pruinosity; fronto-orbital plate with brownish pruinosity; frontal vitta pale brown; antenna with scape and pedicel reddish yellow; postpedicel blackish; arista brown; palpus light yellow. Vertex 0.33–0.37 of head width; parafacial subequal in width to width of 2nd aristomere at middle height; gena 0.20–0.23 of eye height; anterior reclinate orbital seta situated slightly posterior to middle of fronto-orbital plate; fronto-orbital plate with row of short setae; upper occiput and post gena with many fine setulae; antenna with postpedicel subrectangular, 2.0–2.3 times as long as wide, and 4.0–4.5 times as long as pedicel; 2nd aristomere 2–3 times as long as wide; 3rd aristomere thickened in basal 1/3–1/2; palpus clavate; prementum approximately 4 times as long as wide and approximately 0.4 times as long as eye height; labella pad-like.

Thorax. Dorsum gray in ground color, with yellowish pruinosity; pleura brownish, with whitish pruinosity; scutellum yellowish in apical 1/5. Three presutural and 3 postsutural dorsocentral setae; scutellum with pair of discal setae.

Wing. Tegula blackish; basicosta light yellow. Relative lengths of costal sectors two, three, and four approximately 2: 10.5: 5.5; ultimate section of M 4 approximately 0.3 times as long as penultimate section and subequal in length to crossvein dm-m; R

1

bare.

Legs light yellow in ground color; tarsi brownish. Fore tibia with 3–4 anterodorsal, 2–3 posterodorsal and 1 posterior setae; mid femora with 2 anterodorsal setae in middle and 1 posterodorsal setae at apex; hind tibia with 3–5 anterodorsal, 2–3 posterodorsal, and 3–4 ventral setae. Abdomen. Syntergite 1+2, most of tergite 3, and anterior 1/4–1/2 of tergites 4–5 light yellowish, brownish on posterior 1/2–3/4 of tergites 4–5, without pruinosity. Syntergite 1+2 without lateral marginal setae; tergite 3 with a pair of lateral and median marginal setae; sternite 5 with a pair of relatively rounded median lobes on inner edges.

Male postabdomen. Surstylus nearly straight and slightly narrowed apically in lateral view; cerci weakly curved dorsally and somewhat thickened in middle in lateral view, apex curved ventrally and rounded; pregonite narrowed in apical 1/ 3 in lateral view, without seta; postgonite curved ventrally and rounded apically; distiphallus broadly sclerotized in lateral view with some tiny spinules ventrally.

Female. Differing from male as follows: antenna with postpedicel slender, approximately 3 times as long as wide. Female postabdomen. Tergites 6–7 absent; sternite 8 without anterior apodeme.

Host. Unknown.

Distribution. Myanmar [ Burma] (Kambaiti, 2300m) ( MESNIL 1957).