Tachydromia graminum, Fallen, 1915

Shamshev, Igor V. & Grootaert, Patrick, 2004, A Review Of The Genus Stilpon Loew, 1859 (Empidoidea: Hybotidae) From The Oriental Region, Raffles Bulletin of Zoology 52 (2), pp. 315-346 : 318

The S. graminum species group

The group is mainly accepted here following Cumming & Cooper (1992). Members of this group are characterised by an entirely black thorax and tomentose scutum, complete rows of acrostichal setulae, lack of gland-like structures on male abdomen (except S. spinicercus ), at least 1 spine on the left cercus of the male terminalia, and shortened female terminalia. Two species found now from the Oriental region belong to the S. graminum group. The group is most diverse in the Palaearctic region (about 9 species), though at least 2 species of this group are known from the Nearctic and Afrotropical regions.