Empis (Coptophlebia) triseta, Daugeron & Grootaert, 2005

Daugeron, Christophe & Grootaert, Patrick, 2005, Empidine Dance Flies From Singapore And Southern Malaysia (Diptera: Empididae: Empidinae), Raffles Bulletin of Zoology 53 (2), pp. 211-220 : 215-216

Empis (Coptophlebia) triseta , new species

( Fig. 7 )

Material examined. – Holotype - male, Malaysia, Kota Tinggi, riverbed, sample 22041, coll. P. Grootaert, 11 Oct.2000 (KBIN- IRScNB).

Etymology. – From the Latin word seta in reference to the presence of three characteristic dorsal bristles on the male fore tibia.

Diagnosis. – Small-sized dark brown species with all bristles black, fore tibia with 3 distinct dorsal bristles, cercus with a characteristic ventral projection at tip.

Description. – Male – Head. Occiput dark brown blackish, antenna blackish, second and third flagellomeres aristiform. Labrum length about 1.5 times head height. Thorax dark brown with most bristles missing, dorsocentrals apparently uniserial. Legs brown. Fore tibia with 3 distinct dorsal bristles (at middle, at apical third, at apical quarter), the first two longer than tibia depth; first fore tarsomere with 1 strong, rather long anterolateral bristle at base, 1 strong anteroventral bristle at base. Mid femur with strong, long ventral bristles at basal half; mid tibia with 2 strong, long dorsal bristles (at basal and apical quarter), 1 strong, long ventral bristle at basal third; first mid tarsomere with 1 strong, long posterodorsal bristle apically. Hind tibia with row of strong, long dorsal bristles, several strong, rather long ventral bristles at apical half; hind tarsus swollen; first hind tarsomere with 2 pairs of strong, long dorsal bristles, following tarsomeres with distinct pair of dorsal bristles apically. Wing (length = 2 mm) feebly tinged with brown, A1 abbreviated. Halter brown. Abdomen brown. Sternites with distinct pair of bristles posteriorly. Hypopygium ( Fig. 7 ). Cercus with a characteristic short ventral projection at tip. Epandrium subtriangular with some strong bristles ventrally and at tip. Hypandrium short, pointed at tip. Phallus rather long, thin.

Female unknown.

Remarks. – The presence of characteristic dorsal bristles on the fore tibia indicates that this species is a possible member of the E. hyalea clade although the fore tibia is not distinctly deformed. Only the particular shape of cercus tip allows to be sure of the species identification.

Figures

Fig. 7. Male hypopygium of E. (C.) triseta, lateral view. Scale = 4.2 mm.