Cydistomyia tasmaniensis 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 : 28-30

Cydistomyia tasmaniensis Mackerras & Spratt , sp. nov.

( Fig. 20 )

Type material. Holotype female, Tas, from 3 km NW of Exton, Feb. , A.I. Knight ( AM)

Diagnosis. A medium-sized grey species with vittate scutum, broad pale apical margins on abdominal tergites and conspicuous pale triangles on tergites 2–4 and with shiny, dark quadrate callus with short narrow lateral extensions and narrow median extension to middle of frons. Length 14 mm. This represents the only species and specimen of the genus Cydistomyia known from Tasmania.

Female. Head. Eyes (relaxed) reddish black, with dense short hairs. Frons medium, parallel sided, index

3.9. With light grey tomentum with dense long black hairs; vertex not hollow, vertical triangle greyish black with long black hairs; ocellar tubercle inconspicuous; callus shiny, brown, quadrate with short narrow lateral extensions and narrow median extension to middle of frons. Subcallus with fawn brown tomentum without hairs; parafacials and face with cream tomentum and scattered short brown hairs; beard creamy white. Antennal scape and pedicel pale brown with long black hairs, pedicel with short anterior prolongation; basal plate bicoloured, pale brown basally, dark brown apically, with gentle dorsal angle, style dark brown. Palpi fawn with few scattered short black hairs dorsally and on distal tips, denser long white hairs laterally and ventrally.

Thorax. Scutum grey with broad dorsocentral, two lateral and two posterolateral slate grey vittae, well covered in relatively long pale white and brown hairs; notopleural lobe and mesopleuron fawn brown with black hairs. Scutellum slate grey with long pale white hairs. Pleura grey with scattered pale white hairs.

Legs. Femora grey with mixed short black and white hairs; tibiae and tarsi dark brown with short black hairs.

Wings. Clear, stigma pale brown.

Abdomen. Dark brown with broad pale grey apical margins on tergites and conspicuous pale grey triangles on tergites 2–4, margins and triangles with short white hairs, elsewhere hairs short, dark brown. Venter mahogany brown with dark median lunulate markings contrasting with paler lateral areas on sternites 2–5, more uniform dark greyish brown on tergites 6–7.

Distribution. Known only from type locality in N central TAS.

Figures

FIGURES 19–21. 19. Cydistomyia fergusoni Mackerras & Spratt, sp. nov. frons, palp, antenna, female terminalia, sternite 8, spermathecal bulb. 20. Cydistomyia tasmaniensis Mackerras & Spratt, sp. nov. frons, palp, antenna. 21. Cydistomyia hardyi Mackerras & Spratt, sp. nov. frons, palp, antenna, female terminalia, sternite 8, spermathecal bulb.