Cydistomyia griseicolo

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 : 73

Cydistomyia griseicolo r (Ferguson & Hill)

( Fig. 51 )

* Tabanus griseicolor Ferguson & Hill, 1922: 262 . Holotype female, from Hughenden , north Qld (ANIC).

Cydistomyia griseicolor ; Mackerras, 1959: 169; Daniels, 1989: 287; Bickel & Elliot, 1998 -2005: 3.

Other material examined. 9 ♀.

Diagnosis. A medium-sized, slim-bodied, almost concolorous greyish fawn Cydistomyia distinguished from all other species by its exceptionally wide frons, small irregularly quadrate mahogany brown callus and known only from north western Queensland. Length 10–11 mm.

Female. Head. Eyes (relaxed) brown, bare (few scattered short hairs barely visible at 35X magnification). Frons wide, distinctly divergent, index 2.0–2.4, with fawn tomentum, paler and more greyish along eye margins and at side of callus, with short dark brown hairs; vertex slightly hollow; vertical triangle indefinite but with relatively dense hairs; ocellar tubercle not developed, small irregular hollow spot in this position; callus small, mahogany brown, irregularly quadrate, with narrow inconstant extension not reaching to middle of frons (best marked in type). Subcallus flat, with fawn tomentum, without hairs; parafacials and face with greyish cream tomentum and short white hairs; beard white. Antennal scape and pedicel pale fawn-cream, with short black hairs and some white ones below; basal plate brown with orange tint, dorsal angle blunt but well defined; style dark brown. Palpi pale yellowish cream, with short white and scattered brown hairs.

Thorax. Ground colour of scutum grey, with narrow fawn dorsocentral vittae and lateral margins, appearance is of fawn scutum with three grey vittae, pattern not as conspicuous as in trilinealis but particularly distinct in anterior half, with erect black and appressed yellowish cream hairs; scutellum uniformly greyish, with dull creamy hairs. Pleura fawn-grey, with dull creamy hairs.

Legs. Fore and hind femora dark greyish brown, mid femora lighter brown, fore femora with light brown hairs, others with cream to creamy white hairs; tibiae light yellowish cream, with preponderantly pale hairs; tarsi more brown, darker apically, with dark brown hairs.

Wings. Lightly greyish, costal cell not darkened; stigma brown; veins light brown.

Abdomen. Almost uniformly greyish fawn, sometimes with yellowish tint in middle, with apices of tergites inconspicuously paler; hairs entirely yellowish cream, short and sparse giving abdomen smooth appearance. Venter similar, with patch of black hairs in middle of 7 th sternite.

Distribution. Inland N QLD. QLD: Dugald R crossing, 75 km N of Cloncurry, Jan., M.S. & B.J. Moulds; Granada Stn, Cloncurry, Mar., G. van Tets; Julia Ck., Mar., Bell; Richmond, Dec., P.J. Skerman; Hughenden, Mar., Brady; Watten, M. Taylor; Winton, Feb., M. Whitmore; Rodney Downs, SW of Aramac, Dec., G. Russell

Figures

FIGURES 49–51. 49. Cydistomyia brevior (Walker) frons, antenna, palp, female terminalia, sternite 8, spermathecal bulb. 50. Cydistomyia pseudobrevior Mackerras & Spratt, sp. nov. frons, antenna, palp, female terminalia, sternite 8, spermathecal bulb. 51. Cydistomyia griseicolor (Ferguson & Hill) frons, antenna, palp, female terminalia, sternite 8, spermathecal bulb.