Empis (Coptophlebia) hyalea, Melander, 1946

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 : 218-220

Key to species of the Empis (Coptophlebia) hyalea - group from Singapore and Southern Malaysia

(males only)

1. Male fore tibia with several anterodorsal spine-like bristles on basal half ............................................................................... 2

– Male fore tibia without anterodorsal spine-like bristles on basal half ......................................................................................... 3

2. Male fore tibia with anterodorsal spine-like bristles not longer than tibia depth, first fore tarsomere not elongated ( Fig. 1A ), wing pale with median veins almost not visible, epandrium not projected posterodorsally, without a dorsal row of very strong, long bristles ( Fig. 2 ) ................................................................. ............... neesoonensis ( Singapore: Nee Soon: swamp forest)

– Male fore tibia with row of spine-like anterodorsal bristles ending with distinctly longer bristles, first fore tarsomere almost as long as the next four tarsomeres together ( Fig. 1B , 3 ), median veins visible, epandrium projected posterodorsally, with a dorsal row of very strong, long bristles ( Fig. 4 ) ................................ ..... producta ( Singapore: Pulau Ubin, Chek Jawa: mangrove)

3. Male fore tibia without tubercle ........................................... 4

– Male fore tibia with an anterodorsal tubercle at basal quarter ( Fig. 1D ) ........ verruca ( Singapore: Nee Soon: swamp forest)

4. Hind tibia without a cluster of 4 very long basoventral bristles, sternite 8 and epandrium with normal or only a few tortuous bristles ................................................................................... 5

– Hind tibia with a cluster of 4 very long basoventral bristles, sternite 8 and epandrium with numerous very long, more or less tortuous bristles ( Figs. 6A, B ) .................................................. ..................... tortuosa ( Singapore: Nee Soon: swamp forest)

5. Species of small size, fore tibia not distinctly deformed (in lateral view) with 3 distinct dorsal bristles (at middle, at apical third, at apical quarter) ....................................................................... ............................ triseta ( Malaysia: Kota Tinggi: rain forest)

– Species of larger size, fore tibia distinctly deformed at base (in lateral view) with 1 distinct dorsal bristle at middle ............... .. vitisalutatoris ( Singapore: Nee Soon: swamp forest; Pulau Ubin, Chek Jawa: rain forest)

Figures

Fig. 1. Male fore leg in frontal view: A, tibia and first tarsomere of E. (C.) neesoonensis; B, tibia and tarsus of E. (C.) producta; C, tibia and first tarsomere of E. (C.) tortuosa; D, tibia and first tarsomere of E. (C.) verruca.

Fig. 2. Male hypopygium of E. (C.) neesoonensis, lateral view. Scale = 4.2 mm.

Fig. 3. Habitus of E. (C.) producta, male.

Fig. 4. Male hypopygium of E. (C.) producta, lateral view. Scale = 4.2 mm.

Fig. 6. Male postabdomen of E. (C.) tortuosa, lateral view: A, sternite 8; B, hypopygium. Scale = 4.2 mm.