Dixella obscura, (Loew, 1849) (Loew, 1849)

Håland, Øyvind, 2017, Dixella laeta (Loew, 1849) (Diptera, Dixidae) new to Norway, and some characters possibly useful in creating species groups, Norwegian Journal of Entomology 64, pp. 10-18 : 15-16

D. obscura

This species has a distinct basal lobe ( Figure 3B ), and a cercus ( Figure 3C ) with five spines that seems to be progressively shorter towards one end. The apical lobe ( Figure 3A ) is bent more or less visibly in the distal 1/6 of the lobe ( Figure 5 ), this can only be seen in lateral view. The gonostylus ( Figure 3A ) is evenly bowed and evenly thick in most of its length, with no thicker spines at the distal end. The outline of the distal end of the 10 th sternite ( Figure 6C ) is rounded, with two areas of shorter and weaker hairs than in laeta and dyari .

The middle and lateral stripes on the scutum are connected by a much lighter area.

Dixella obscura Loew

has been found in HEN, NSY, NSI ( Håland, 1997), Finnmark in FV, FI and FØ (Andersen et al. 2015), and in HES, VE, ON, OS, BV, STI, and NNØ (unpublished data from the authors collection).

Figures

FIGURE 3. Dixella obscura Loew, 1849. A. Gonostylus and apical lobe; B. Basal lobe; C. Cercus.

FIGURE 5. Dixella obscura Loew, 1849. The sharp bow of the apical lobes can be seen in this picture taken of the hypopygium seen in lateral position.

FIGURE 6. Distal end of 10th sternite of (A) D. laeta, (B) D. dyari, (C) D. obscura, and (D) D. autumnalis.