Stenopygium Becker

Soares, Matheus M. M. & Ale-Rocha, Rosaly, 2020, New records of Stenopygium Becker (Diptera: Dolichopodidae) from the Neotropical Region, and a key to species, Zootaxa 4868 (1), pp. 129-134 : 129

Key to the species of Stenopygium Becker

1 Male postpedicel elongate and distinctly narrowed distally, with ventral indentation ( Fig. 2 ); female postpedicel triangular ( Fig. 3 ); mesonotum without gray dorsocentral stripe ( Fig. 5 ); wing mostly brown ( Fig. 4 ); male terminalia with cercus long and narrow, as long as hypopygium ( Fig. 6 )................................................... S. nubeculum Becker

- Male postpedicel without ventral indentation, neither prolonged nor distinctly narrowed distally ( Fig. 10 ); female postpedicel subtriangular with rounded apex ( Fig. 11 ); mesonotum with gray dorsocentral stripe interrupted by dark brown spots at base of dorsocentral bristles ( Fig. 13 ); wing hyaline, with brown spots, mostly evident on anterior half of wing ( Fig. 12 ); male terminalia with cercus short and subtriangular, shorter than hypopygium ( Fig. 14 )...................... S. punctipennis (Say)

Figures

FIGURES 1–6. Stenopygium nubeculum Becker, 1922. 1. Head, anterior view (♂); 2–3. Head, lateral view: 2. Male; 3. Female; 4. Wing (♂); 5. Mesonotum, dorsal view (♂); 6. Hypopygium, lateral view. Abbreviations: C—costal vein; dc s—dorsocentral seta; dmm—discal medial crossvein; M 1—first branch of media; M 4—fourth branch of media; R 4+5—third branch of radius.

FIGURES 9–14. Stenopygium punctipennis (Say, 1829). 9. Head, anterior view (♂); 10–11. Head, lateral view: 10. Male; 11. Female; 12. Wing (♂); 13. Mesonotum, dorsal view (♂); 14. Hypopygium, lateral view.