Setihercostomus scharffi (Grichanov) Grichanov, 2014

Grichanov, Igor Ya., Kaae, Mathias & Pape, Thomas, 2014, Discovery of Setihercostomus Zhang et Yang in the Afrotropical Region (Diptera: Dolichopodidae), Zootaxa 3861 (6), pp. 598-600 : 598-600

Setihercostomus scharffi (Grichanov) , comb. nov.

( Figs 1–3 )

Hercostomus scharffi Grichanov, 1999: 36 .

Type material examined. HOLOTYPE ♂, labeled: Tanzania: “Uzungwe Mts., Mwanihana Forest above Sanje, 1000 m, 01.VIII.1981, M. Stoltze & N. Scharff leg.” ( ZMUC, terminalia in glycerin). PARATYPE: 1 ♂, Udzungwa Mts., Mwanihana Forest, Sanje River, 1400 m, 16.viii.1982, M. Stoltze & N. Scharff leg. ( ZMUC).

Additional material examined. Tanzania: 1 ♂, data as holotype ( ZMUC, genitalia missing); 1 ♂, Morogoro Reg., Udzungwa Mts. National Park, Sanje trail, 22–24.i. 2014, 850 m, Malumbres Olarte, T. Pape & N. Scharff leg. ( ZMUC).

Diagnosis. Using the key of Yang et al. (2011), Setihercostomus scharffi seems close to S. huangi ( Zhang et al., 2004) from Yunnan, but differs from that species by its entirely yellow abdominal segment 1 and partly yellow segments 2 and 3, entirely yellow hind coxa and femur, and different shape and setation of the epandrial appendages (compare Grichanov 1999, fig. 29 and Zhang et al. 2004, figs 3, 4; Yang et al. 2011, fig. 673). Setihercostomus huangi has an entirely dark abdomen, hind coxa mainly dark, and hind femur with black apex.

Setihercostomus scharffi is known only from four males, including two types from the type locality, Udzungwa Mountains ( Tanzania). Setihercostomus is part of the Dolichopus generic group (sensu Brooks 2005), being close to Gymnopternus Loew, 1857 ( Yang et al. 2011) . Most species appear to be rare in collections, but the genus as a whole is now documented to be widely distributed in the Old World, occurring in the Afrotropical, Oriental and Palaearctic regions.

Couplet 9 of Grichanov’s key to Afrotropical genera of Dolichopodinae ( Grichanov 2011) should be modified as follows to facilitate the identification of Setihercostomus :

9 Clypeus bearing one pair of strong bristles in both sexes; anepimeron with group of fine hairs right in front of posterior spiracle; mid tibia with at least one strong ventral seta; male cercus simple ......... Setihercostomus Zhang et Yang - Clypeus bare; anepimeron bare, at most with one fine black seta anteriorly; mid tibia with at most one row of few weak ventral setae; male cercus often ornamented with processes or bunches of long cilia.......................................... ........................................................................................................................................... Neohercostomus Grichanov

Figures

FIGURE 1. Wing of Setihercostomus scharffi (Grichanov, 1999).

FIGURE 2. Head of Setihercostomus scharffi (Grichanov, 1999), lateral view.

FIGURE 3. Hypopygium of Setihercostomus scharffi (Grichanov, 1999), right lateral view.