Ptecticus tricolor

Rozkošný, Rudolf & Hauser, Martin, 2009, Species groups of Oriental Ptecticus Loew including descriptions of ten new species with a revised identification key to the Oriental species (Diptera: Stratiomyidae), Zootaxa 2034, pp. 1-30 : 24

8. P. tricolor group

Species: P. intensivus , P. siamensis , P. tricolor

Characteristics: (1) Upper frons, vertex and median occipital sclerite black; (2) Scutum with 3 broad longitudinal black stripes; (3) wings distinctly infumated; (4) vein R2+3 shorter than or as long as Rs and radial triangle (r2+3) low (barely higher than half length of crossvein R-M) and opened or closed at costal margin, crossvein M-Cu developed ( Figs 48–49 ); (5) M3 distinctly sinuate, postcubitus (CuP) strong and pigmented; (6) male epandrium much longer than broad, proctiger and cerci small, short and ventrally oriented surstylus in P. siamensis , genital capsule suboblong, with rounded inner posterior projection in P. tricolor , gonostylus with inner pointed lobe near base, aedeagal complex long and tube-like with flat basal part (aedeagal apodeme).

Remarks: This species group is apparently closely related to the cingulatus group showing the same type of the wing venation and similar plesiotypic shape of the male terminalia. Externally the tricolor group differs by the longitudinally striped scutum and the distinctly infuscated wings. The abdomen is red on tergites 2–4 in P. tricolor , extensively darkened in P. siamensis and transversely banded in P. intensivus .

Figures

FIGURES 42 – 49. 42 – 43. Ptecticus longipennis (Wiedemann), right wing (42) and medial part of costal margin (43). Scale: 5 mm (42); 0.5 mm (43). 44 – 45. Ptecticus shirakii Nagatomi, right wing (44) and medial part of costal margin (45). Scale: 2 mm (44); 0.5 mm (45). 46 – 47. Ptecticus japonicus (Thunberg), right wing (46) and medial part of costal margin (47). Scale: 5 mm (46); 1 mm (47). 48 – 49. Ptecticus tricolor van der Wulp, right wing (48) and medial part of costal margin (49). Scale: 5 mm (48); 1 mm (49).