Cydistomyia infirmus 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 : 60

Cydistomyia infirmus Mackerras & Spratt , sp. nov.

( Fig. 42 )

Type material. Holotype female, NSW, Mt Westmacott , nr Waterfalls, Dec., G. Daniels ( AM).

Non-type material examined. NSW: 1♀ Bondo State Forest , 9.ii.1982, P. Haycock ( ANIC). VIC : 1♀ Tennyson Ck 5 km NW Buldah, 10-15.i.1982, ANZSES Expedition ( GDCB) .

Diagnosis. A medium-size, 13–15 mm brown species like a brown C. pruina with inconspicuous median dark abdominal vitta, wide frons, tear-drop shaped callus with long narrow extension reaching two-thirds length of frons and about half the width of the frons at its base, with a black beard and brown antennal basal plate.

Female. Head. Eyes (relaxed) black, bare. Frons wide, slightly divergent, index 3.2, with fawn brown tomentum with dense long black hairs; vertex not hollow; vertical triangle inconspicuous; ocellar tubercle shiny, ocelli not visible; callus shiny, brown, tear-drop shaped with long narrow extension to two-thirds length of frons, about half width of frons at base. Subcallus with fawn tomentum, without hairs; parafacials and face with fawn tomentum with dense black hairs; beard predominantly black with scattered white hairs. Antennal scape and pedicel fawn grey with black hairs, pedicel with pronounced anterior prolongation almost reaching dorsal tooth; basal plate brown with gentle basal dorsal angle and small tooth, fine apical swelling ventrally; style dark brown. Palpi fawn with black hairs, longer in basal half, relatively slender.

Thorax. Scutum and scutellum grey, former pale brown laterally, both with short red brown hairs, longer on posterior margin of scutellum. Pleura fawn grey with predominantly long black hairs with some pale white ones.

Legs. All brown, femora with long black hairs and tibia and tarsi with short black hairs.

Wings. Clear, stigma inconspicuous.

Abdomen. Brown with indistinct median black vitta, narrow pale apical margins on all tergites, with fine white hairs on margins and small patches of white hairs laterally on tergites 1–4; elsewhere hairs black. Venter brown with some scattered black patches especially laterally; with narrow pale apical margins with fine white hairs on all sternites; elsewhere hairs black.

Distribution. S of Sydney, inland NSW and VIC.

Etymology. The specific epithet derives from the Latin for weak and refers to the indistinct dark median vitta on the abdomen of this species.

Figures

FIGURES 40–42. 40. Cydistomyia fenestra Mackerras & Spratt, sp. nov. frons, antenna, palp, female terminalia, sternite 8, spermathecal bulb. 41. Cydistomyia pruina Mackerras & Spratt, sp. nov. frons, antenna, palp, female terminalia, sternite 8, spermathecal bulb. 42. Cydistomyia infirmus Mackerras & Spratt, sp. nov. frons, antenna, palp.