Cydistomyia exemplum Mackerras & Spratt, 2008

Mackerras, I. M., Spratt, D. M. & Yeates, D. K., 2008, Revision of the horse fly genera Lissimas and Cydistomyia (Diptera: Tabanidae: Diachlorini) of Australia, Zootaxa 1886 (1), pp. 1-80 : 33-34

Cydistomyia exemplum Mackerras & Spratt , sp. nov.

( Fig. 23 )

Type material. Holotype female, S Qld, Mt Chinghee , 12 km SE Rathdowney, 700 m, Dec. 1982, G.B. Monteith, D.K. Yeates and G. Thompson ( QM # T144397 ).

Diagnosis. A medium-sized, rather plain dark brown species distinguished from C. obscurus , C. monteithi and C. sabulosus by brown wings with brown suffusion in costal cell, brown scutum with broad median and more narrow lateral pale orange-brown vittae each containing rows of dark brown horizontal stripes giving a herring-bone appearance at 15–20X magnification, much narrower frons with narrow flask-shaped callus. Further distinguished from C. obscurus by thicker less elongate basal plate and absence of anterior prolongation on pedicel. Length 13 mm.

Female. Head. Eyes (relaxed) red-brown, bare. Frons convergent then divergent, very narrow, index 7.2, with dark brown tomentum and very few scattered short black hairs; vertex hollow, v ertical triangle and ocellar tubercle not observed; with flask-shaped bulging brown callus about one half width of frons at base, with sharply tapering extension reaching middle half of frons. Subcallus brown, no hairs; parafacials and face with greyish brown tomentum and scattered short black hairs; beard sparse, mixed brown and black hairs. Antennal scape and pedicel greyish brown with black hairs, scape same width as length; flagellum light brown, basal plate with gently rounded dorsal angle. Palpi brown, with dense long black hairs.

Thorax. Scutum with broad median and more narrow lateral pale orange-brown vittae each containing rows of dark brown horizontal stripes giving a herring-bone appearance at 15–20X magnification, with few scattered white and black hairs around periphery. Scutellum uniform brown with scattered black hairs.

Legs. Legs brown, forelegs slightly darker than others and with black hairs, other legs with mixed black and white hairs.

Wings. Wings pale brown, brown suffusion in costal cell, stigma pale brown.

Abdomen. Paler brown than thorax, with narrow pale apical bands on tergites and mixed fine black and white hairs, with small patches of white hairs on lateral margins of tergites., Venter similar, with narrow pale apical bands with short white hairs on margins of sternites.

Distribution. Known only from type locality, in SE QLD near the border of NSW.

Etymology. The specific epithet derives from the Latin for pattern and refers to the herring-bone pattern on the thorax.

Figures

FIGURES 22–24. 22. Cydistomyia bancroftae Mackerras frons, antenna, palp, female terminalia, sternite 8, spermathecal bulb. 23. Cydistomyia exemplum Mackerras & Spratt, sp. nov. frons, antenna, palp. 24. Cydistomyia obscurus Mackerras & Spratt, sp. nov. frons, antenna, palp.