Cydistomyia magnetica (Ferguson & Hill)

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 : 51-53

publication ID	https://doi.org/ 10.11646/zootaxa.1886.1.1
persistent identifier	https://treatment.plazi.org/id/D95287EC-2400-FF91-FF73-FAA69534F96F
treatment provided by	Felipe
scientific name	Cydistomyia magnetica (Ferguson & Hill)
status

Treatment

Cydistomyia magnetica (Ferguson & Hill) View in CoL

( Figs. 5 View FIGURES 1–8 , 37 View FIGURES 37–39. 37 )

Tabanus alternatus var. magneticus Ferguson & Hill, 1922: 258 ; Hardy 1944: 84. Holotype female, from Magnetic Island, north Qld (ANIC).

Cydistomyia magnetica View in CoL ; Mackerras 1959: 167; Daniels, 1989: 287; Bickel & Elliot, 1998 -2005: 4.

Other material examined. 28 ♀, 1 ♂.

Diagnosis. A medium to large dark blackish species closely related to C. doddi but distinguished from it by slightly wider frons, clearly defined anterior ocellar spot, oblong callus with narrow extension, more uniform brown clouding on wings, definite median triangles on tergites 2–4, and basal plate of antennal flagellum with sharp upwardly directed dorsal tooth which does not project anteriorly. Length 13–17 mm.

Female. Head. Eyes (relaxed) blackish, bare (short sparse hairs easily visible at 35X magnification). Frons narrow, parallel or slightly divergent, index 4.3–5.3, with dull fawn-brown tomentum on upper half and grey tomentum on lower half, short black hairs overall; vertex not hollow, vertical triangle black; ocellar tubercle well-defined, raised, blackish brown, anterior ocellar spot clearly defined, posterior ocelli not visible; callus raised, oblong, with narrow extension to upper third of frons, shiny, black, slightly less than width of frons at base. Subcallus smooth, with ashy tomentum becoming fawnish brown over antennae, without hairs; parafacials with ashy tomentum and short predominantly white hairs; face with pale grey tomentum, rather sparse fine black hairs above; beard white. Antennal scape with greyish black tomentum, short coarse black hairs, moderately developed dorsal prolongation; pedicel blackish brown, with well developed dorsal prolongation, short coarse black hairs; basal plate brownish black, with dorsal angle forming sharp upwardly directed tooth which does not project forward; style slender, black, approximately same length as basal section. Palpi with ashy tomentum and white hairs on basal half of segment 2, grey speckled tomentum and short black hairs on distal half, mixed greyish white and black hairs on palpal segment 1. Labella with inconspicuous lateral chitinised bar, less definite than in doddi .

Thorax. Scutum and scutellum dark brown with olive hue, with traces of darker median and dorsocentral lines, greyish on lateral margins, with short black and scanty appressed yellow hairs; marginal hairs black in front of wing root, mixed black and white with a few yellowish ones behind it. Pleura pale grey with white hairs, contrasting with dark scutum.

Legs. Black, slender; hairs black except for ventral and basal pale grey fringe on femora.

Wings. Distinctly and almost uniformly suffused with greyish brown from apices of basal cells to near tip of R 2+3 and backward through marginal cells to cua 1, vague clearer areas present in R and d; costal cell entirely brown.

2+3

Abdomen. Blackish brown, first tergite dark brown in middle basally, grey along hind margins, ashy grey laterally; subsequent tergites brownish black in middle third, dark brown laterally, with narrow pale apical margins on 2 nd and 3 rd tergites, wider more conspicuous pale apical band on 4 th tergite; conspicuous small median white-haired apical spots on 1 st and 5 th tergites, widening into definite white-haired median triangles on tergites 2–4, lateral apical white-haired triangles on tergites 2–4, elsewhere hairs black. Venter blackish brown, greyish in centre of 1 st and 2 nd sternites, with grey to ashy white haired apical margins on sternites 2–4, elsewhere hairs black.

Male. Similar to female but darker in colour, without pale apical bands and median triangles on tergites 2–4. Eyes bare (scattered short hairs visible at 35X magnification), (relaxed) red to reddish brown, meeting in mid line, upper facets not appreciably enlarged nor differentiated from lower ones. Scutum with sparse appressed dull yellowish hairs, with longer golden yellowish hairs marginally, particularly above wing root and on dark pleura. Ocellar tubercle well developed, oval, blackish brown, without hairs, projecting slightly above level of eyes. Basal plate of antennal flagellum more slender. Palpi elongate, conical, with bluntly rounded point, long white hairs basally, shorter black hairs with a few white ones apically.

Distribution. Magnetic Island to N of Warwick QLD. QLD: Magnetic Is., Nov., G.F. Hill, Dec., I.M. Mackerras; Little Crystal Ck, Mt Spec, biting, Nov., I.M. Mackerras; The Saddle, 8 km E of Paluma, Apr., P. Ferrar; Plane Ck; Mackay, Nov.; Sarina, Jan.–Feb.; Yeppoon, Sept., G.M. Goldfinch; Port Curtis; Townsville, Dodd; Cape Upstart, Shark Bay, Apr., G.B. Monteith; Carlisle Is., Dec., S.R. Monteith; Byfield State Forest, Jan., G. Daniels; Westwood, W of Rockhampton, Nov., R. Eastwood; Blackdown Tableland via Dingo, Feb., G.B. Monteith; Bluff Ra., nr Biggenden, Dec.–Jan., H. Frauca; Coast Ra., nr. Biggenden, Jan., H. Frauca; Mt Walsh Nat. Pk., 11 km S of Biggenden, Dec.–Jan., H. Frauca; 2.5 km NE of Landsborough, Mar., G.B. Monteith; Mooloolabah, Oct., C.F. Ashby; Boolomba Ck, Conondale Ra., Dec., G.J. Ingram; Mt Huntley, Jan., G.B. Monteith;

Kingdom	Animalia
Phylum	Arthropoda
Class	Insecta
Order	Diptera
Family	Tabanidae
Genus	Cydistomyia