Bandella costalis, Bickel, 2002

Bickel, Daniel J., 2002, Bandella, A New Hilarine Fly Genus from Australia (Diptera: Empididae), Records of the Australian Museum 54, pp. 313-324 : 323

Bandella costalis n.sp.

Figs. 2k, 4e

Type material. HOLOTYPE, 3, PARATYPE, ♀, Western Australia: 11 km S of Pemberton , 34°32'S 116°02'E, 6.x.1981, I. Naumann & J. Cardale (both ANIC) .

Additional material: Western Australia: 33, 3♀, 10 km N of Walpole , 7.x.1970 ; 73, 6♀, Nornalup NP, 9.x.1970, coll. D.H. Colless, ANIC .

Description (male): length: 10.0; wing: 7.5×2.2. Head: vertex and frons shining black with no pruinosity; ventral postcranium with scattered pale setae; postorbitals as short hairs, white ventrally, black dorsally; face covered with silvery pruinosity; labrum yellow, labellum dark brown; antenna dark brown; scape and pedicel setose.

Thorax: pleura black, although meron and laterotergite with large yellowish areas, and covered with grey pruinosity; mesonotum and scutellum entirely black and shining with no pruinosity ( Fig. 2k); postnotum black but covered with grey pruinosity; entire mesonotum with only setulae, no major setae present; ac band narrow, 2–3 setulae wide, with bare cuticle each side of this band extending to posterior slope, and with narrow dc row.

Legs: coxae mostly reddish yellow; remainder of legs yellow, except apex of trochanters and very base of femora black, and distalmost tarsomeres infuscated; coxae with only short pale vestiture, no strong setae, remainder of legs with black vestiture; TI with pair apical av-pv setae, It 1 with very long posterior setae, and with slightly longer than normal anterior setae; It 2–3 each with 2–3 pairs of long anterior and posterior setae (MSSC); TII ( Fig. 4e) in distal half with some long anterior and posterior setae, and apically with some strong av, pv and ventral setae (MSSC); IIt 1 with very long anterior and posterior setae, and It 2–3 with long posterior setae only (both MSSC); IIt 4–5 unmodified (MSSC); FIII slightly clavate in distal half; TIII with some irregular long setae, especially ventrally (MSSC); IIIt 1 with long posterior setae (MSSC), but not as long as those of IIt 1; IIIt 2 with 3–4 long posterior setae, and IIIt 3 with some long apical setae (MSSC); IIIt 4–5 unmodified.

Wing: stigma brownish and diffuse.

Abdomen: terga yellowish with dark-brown to black posterior borders, and with weak dorsal infuscation; postabdomen (not figured) with tergum 8 developed into lateral flap-like projection; hypopygium mostly yellow, with somewhat enlarged hypandrial keel which projects posteriorly.

Female similar to male except as noted: face slightly wider; tibiae and tarsi with only short unmodified vestiture, without long anterior and/or posterior setae.

Remarks. Bandella costalis is known from wet sclerophyll karri forests in southwestern Western Australia. Male tibiae and tarsi variously have long anterior and/or posterior setae, especially well developed on leg II ( Fig. 4e).