Brachygasterina Macquart

De Carvalho, C. J. B. & Pont, A. C., 2006, Taxonomy, cladistics and biogeography of the South American genus Brachygasterina Macquart (Diptera: Muscidae), Zootaxa 1151, pp. 1-26 : 4

Key to species of Brachygasterina Macquart

(males are unknown for B. andina , B. fulvohumeralis , B. stuebeli and B. valdiviensis )

1. General colour metallic violet­blue; humeral callus and prothoracic spiracle orangeyellow, notopleura dull reddish­yellow; calypters dark brown ( Chile)........................... .................................................................................. B. fulvohumeralis ( Malloch, 1922)

­ General colour subshining dark metallic violet­blue, including humeral callus and notopleura; prothoracic spiracle black; calypters brownish with dark brown margins 2

2. Base of R4+5 on wing with cilia on both surfaces; hind tibia on anterodorsal and anteroventral surfaces with at least 4 and 3 setae respectively; prealar seta absent (male) or weak (female), shorter than anterior notopleural seta; sternite 1 setulose. Male: hind femur on posteroventral surface bare on apical half and with longer setae on basal half. Female: fore tibia on anterodorsal surface with 4 short setae on apical half ( Chile, Argentina) .............................................................. B. major Malloch, 1934

­ Base of R4+5 on wing bare on both surfaces; hind tibia on anterodorsal and anteroventral surfaces with at most 3 setae (frequently 2); prealar seta subequal to or much longer than anterior notopleural seta; sternite 1 bare. Male: hind femur not as above. 3

3. Eye with long and dense hairs ( Fig. 3 ); facial ridge with setulae reaching almost to level of aristal insertion ( Fig. 8 ); wing with crossvein dm­cu very sinuous, about 1/3 of the distance to r­m; vein M slightly upcurved toward R4+5 ( Ecuador, Colombia)........... ................................................................................................. B. stuebeli ( Röder, 1886)

­ Eye with short and sparse hairs ( Figs 1, 4, 5 ); facial ridge bare or at most with a few setulae reaching only to mid­level of first flagellomere; wing with crossvein dm­cu less sinuous, at most 1/5 of the distance to r­m; vein M straight, parallel with R4+5 .... 4

4. Facial ridge bare ( Fig. 6 ). Male unknown. Female: parafacial narrow, in lateral view at narrowest point 0.2 of width of first flagellomere ( Fig. 6 ) ( Ecuador) ............................ ............................................................................................................ B. andina sp. nov.

­ Facial ridge with a few setulae, reaching only to mid­level of first flagellomere ( Figs 9, 10 ). Female: parafacial very narrow, in lateral view at narrowest point less than 0.2 of width of first flagellomere ( Figs 9, 10 ) ................................................................... 5

5. Male: hind femur on posteroventral surface with long setae on apical half, shorter on basal half. Female: fore tibia on dorsal surface without a preapical seta; length of sternite 6 about half the length of the segment; 3 spermathecae ( Chile, Argentina) ........... ................................................................................... B. violaceiventris Macquart, 1851

­ Male unknown. Female: fore tibia on dorsal surface with a preapical seta; length of sternite 6 about 1/3 the length of the segment; 2 spermathecae ( Chile) ......................... ...................................................................... B. valdiviensis ( Pamplona & Couri, 2000)

Figures

FIGURES 1 – 5. Female head, frontal view. 1. Brachygasterina andina. 2. B. major. 3. B. stuebeli. 4. B. valdiviensis. 5. B. violaceiventris. Scale bar: 1 mm.

FIGURES 6 – 12. Head, lateral view. 6. Female, Brachygasterina andina. 7. Female, B. major. 8. Female, B. stuebeli. 9. Female, B. valdiviensis. 10. Female, B. violaceiventris. 11. Male, B. major. 12. Male, B. violaceiventris. Scale bar: 1 mm.