Beckerina umbrimargo (Becker)

Disney, R. Henry L., 2004, Genera resembling Beckerina Malloch (Diptera: Phoridae), Zootaxa 518 (1), pp. 1-28 : 9-11

Beckerina umbrimargo (Becker)

( Figs 1–8 )

Phora umbrimargo Becker, 1901: 65 .

Aphiochaeta umbrimargo (Becker) . Brues, 1903: 398.

Beckerina umbrimargo (Becker) . Malloch, 1910: 90.

The description by Lundbeck (1922) is supplemented by Figs 1–8 and comments below. Male frons as Fig. 7 , but in addition there are four differentiated robust hairs either side of the SAs. The postpedicel (third antennal segment) has numerous SPS vesicles whose diameters range between those of the hair sockets to those of the SAs sockets. Labella of both sexes with fewer than twenty scattered spinules below each. Notopleuron with three bristles and male with a fully exposed orifice of the notopleural gland duct (N in Fig. 2 ). Right posterolateral lobe of male epandrium strongly extended rearwards and lobes at rear of hypandrium greatly reduced ( Fig. 8 ). Female abdomen with orifice of common duct of paired dorsal glands between tergites 5 and 6 ( Fig. 6 ). Paired lobes at rear of segment 8 of venter heavily pigmented ( Fig. 5 ). Furca (internalised sternite 9) an irregular hoop with an associated vaginal sclerite ( Figs 4–5 ). Hairs below basal half of hind femur not differentiated from adjacent hairs of anterior face. Spinules of apical combs of hind tibiae all simple. Wings ( Fig. 1 ) with outer half of costa a little thickened; no hair at base of vein 3; costal cilia relatively short; Sc strong and fusing with R1; at least the first three thin veins (veins 4–6) brown; several axillary bristles; membrane with well developed, dense, microsetae.

Material

Numerous males and females from the British Isles. Widely distributed in Europe.

Figures

FIGURES 1–2. Beckerina umbrimargo male: (1) right wing; (2) left notopleuron and humerus (H = humerus, M = mesopleuron, N = opening of notopleural gland, S = spiracle, T = tegula). Scale bars = 0.1 mm.

FIGURES 3–6. Beckerina umbrimargo female: (3) furca (internalised abdominal sternite 9) from above, with anterior end to top; (4) furca from side; (5) right lobe at rear of abdominal sternum 8; (6) abdominal tergites 5 and 6. Scale bars = 0.1 mm.

FIGURES 7–8. Beckerina umbrimargo male: (7) frons, with bristles represented by their sockets only; (8) left face of hypopygium. Scale bars = 0.1 mm.