Marbenia Malloch

Ale-Rocha, Rosaly, Freitas, Geovânia & Mathis, Wayne N., 2014, Revision of the Neotropical genus Marbenia Malloch (Diptera: Periscelididae), Zootaxa 3872 (4), pp. 365-375 : 367

Key to the species of Marbenia Malloch

1. Frons brown or pale brown with lateral margins yellow; face brown with small yellow spots ( Fig. 17 ); wing predominantly brown, with basal 1/3 yellowish and 2 hyaline spots in the brownish portion ( Fig. 19 )......... Marbenia peculiaris Malloch

- Frons entirely yellow; face pale brown or yellow ( Figs 2 , 9 ); wing yellowish tinged with apical, posterior margin and a transverse band gray ( Figs 4 , 11 )............................................................................. 2

2. Scutum covered with sparse pale gray pruinescence ( Fig. 3 ); face pale brown, lacking spots, with 1 transversal furrow ( Fig. 2 ); gena and postgena brown; abdomen brown............................................ Marbenia cinerea , sp. nov.

- Scutum covered by dense golden pruinescence ( Fig. 10 ); face yellow with lateral margins darkened on upper half, with 2 deep transversal furrows ( Fig. 9 ); gena and postgena yellow; abdomen pale brown................. Marbenia pallida , sp. nov.

Figures

FIGURES 16 – 19. Marbenia peculiaris Malloch: 16, habitus, lateral view; 17, head, frontal view; 18, dorsum of thorax; 19, left wing, dorsal view.

FIGURES 1 – 4. Marbenia cinerea, sp. nov. (holotype): 1, habitus, lateral view; 2, head, frontal view; 3, dorsum of thorax; 4, left wing, dorsal view.

FIGURES 8 – 11. Marbenia pallida, sp. nov.: 8, habitus, lateral view; 9, head, frontal view; 10, dorsum of thorax; 11, left wing, dorsal view.