Macrostomus limbipennis

Rafael, José Albertino & Cumming, Jeffrey M., 2012, Revision of the genus Macrostomus Wiedemann (Diptera, Empididae, Empidinae). III. The limbipennis species-group, Zootaxa 3361, pp. 45-55 : 46

Key to species of the M. limbipennis species-group (male specimens).

1. Fore tarsomere 1 swollen ( Fig. 1 ); wing entirely hyaline with inconspicuous pterostigma ( Fig. 4 )....... M. inflatus , sp. nov.

– Fore tarsomere 1 normal ( Fig. 12 ); wing with costal and distal margin or only distal margins distinctly infuscated ( Figs. 15, 16 , 35 )................................................................................................. 2

2. Postgenal and antepronotal setae as strong as dorsal thoracic setae; hypandrium somewhat narrow at apex, subequal in diameter along its length ( Fig. 19 )............................................................................. 3

– Postgenal and antepronotal setae weaker than dorsal thoracic setae; hypandrium distinctly wider at apex ( Figs. 31 , 38 )..... 4

3. Tergite 8 humped with microspinulose lateral expansion ( Figs 17, 18 ); apex of posterior cercus wide ( Fig. 18 ); cell dm slightly acute ( Figs. 15, 16 ).................................................................. M. limbipennis (Bezzi)

– Tergite 8 not humped, without microspinulose lateral expansion; apex of posterior cercus narrow; cell dm truncate...................................................................................... M. penai Rafael & Cumming

4. Tergite 8 with wide median projection at distal margin ( Fig. 29 ); hypandrium with apex approximately twice basal width ( Fig. 31 )............................................................................ M. nigriventris (Macquart)

– Tergite 8 with acute median projection at distal margin ( Fig. 36 ); hypandrium with apex approximately three times basal width ( Fig. 38 )............................................................................... M. nitidus sp. nov.

Figures

FIGURES 1 – 11. Macrostomus inflatus, sp. nov. 1 – 7, paratype male. 1, fore leg; 2, mid leg; 3, hind leg; 4, wing; 5, tergite 8, dorsal view with right setae omitted; 6, terminalia, lateral view (epandrium electronic gray colored); 7, hypandrium and phallus, lateral view; 8 – 11, paratype female. 8, tergite 8, 10 and cercus, lateral view; 9, tergite 8, dorsal view; 10, sternite 8, ventral view; 11, genital fork, ventral view. Scales: 1 – 3 = 0.5 mm; 5 – 10 = 0.2 mm; 11 = 0.1 mm. Abbreviations: AC, anterior cercus; AL, anterior lobe of epandrium; CE, cercus; EP, epandrium; MC, median cercus; PC, posterior cercus; PL, posterior lobe of epandrium; St, sternite; T, tergite.

FIGURES 12 – 19. Macrostomus limbipennis (Bezzi), lectotype male. 12, left fore leg, posterior view; 13, left mid leg, anterior view; 14, left hind leg, anterior view; 15, right wing; 16 – 19, Peruvian male specimen; 16, wing; 17, tergite 8, dorsal view with right setae omitted; 18, terminalia, lateral view; 19, hypandrium and phallus, lateral view. Scales: 12 – 14 = 0.5 mm; 17 – 19 = 0.2 mm.

FIGURES 32 – 38. Macrostomus nitidus, sp. nov. 32 – 35, paratype male from Goiás, Brazil; 32, left fore leg, posterior view; 33, left mid leg, anterior view; 34, right hind leg, anterior view; 35, wing; 36 – 38, holotype male; 36, tergite 8, dorsal view, right setae omitted; 37, terminalia, lateral view; 38, hypandrium and phallus, lateral view. Scales: 32 – 34 = 0.5 mm; 36 – 38 = 0.2 mm.

FIGURES 26 – 31. Macrostomus nigriventris (Macquart), holotype. 26, right mid leg, posterior view; 27, left wing; 28, apex of medial lobe of cercus; 29, tergite 8, dorsal view with right setae omitted; 30 terminalia, lateral view, setae omitted; 31, hypandrium and phallus, lateral view, setae broken, insertion indicated. Scales: 26 = 0.5 mm; 28 – 31 = 0.2 mm.