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Genus Leptopeza Macq.
Cell 1st M2 present; veins M1 and M2 fused throughout; Cu2 not forming an acute angle with 1st A, the cell Cu being shorter than cell M; anal angle rounded, not strongly developed. Antennae short, three-jointed, the third joint broad at the base but pointed apically and terminated by a long bristle-like style.
| (a.) | A black fly with tawny legs | nigra n. sp. |
| (b.) | An orange-yellow fly with abdominal segment branded with fuscus | fulvescens n. sp |
| Provisional Table based on Chaetotaxy. | ||
| (a.) | One pair of scutellars; four weak prothoracics on each side (fig. 35); occipitals in two rows, the outer stronger, the inner weaker, and ending in a pair of weak verticals on each side of ocellar triangle (fig. 34) | fulvescens n. sp. |
| (b.) | Two pairs of scutellars; two weak prothoracics on each side (fig. 32); occipitals in two rows, the outer weaker, the inner stronger, and not reaching vertex; a weak bristle close to orbit opposite the terminal one of the inner row (fig. 31) | nigra n. sp. |
L. nigra n. sp.
♂. Perpendicular axis of head long; eyes situated well forward, emarginate at antennae, below which they are holoptic, face being almost comptetely eliminated (fig. 29); above antennae eyes are closely approximated, the black front in consequence being very narrow; ocellar triangle broad, reaching from eye to eye, black, ocelli golden; a pair of conspicuous ocellar bristles. Antennae situated high up on head, black; first and second joints short and of about equal length (fig. 30), both clothed with minute hairs, second globular and with fringe of bristles; third joint longer than first and second together, flat, broad basally but pointed apically, and clothed with short and delicate grey hairs; arista very long, bristle-like, and minutely setose. Face black, extremely narrowed owing to eyes being holoptic for some distance below antennae and thence closely approximated; cheeks eliminated by eyes; only apex of mouth-parts projecting; proboscis brownish and palpi black. Occiput large, convex, cinereous-black; clothed with greyish hairs below, bristly above; chaetotaxy shown in fig. 31.
Thorax humped, cinereous-black, but practically black in some lights; pleurae bare, lighter in colour than dorsum, which is clothed with short delicate bristles and larger ones arranged as in fig. 32. (The course of acrostichals toward scutellar suture is lost owing to position of pin through the only specimen.) Four bristles on scutellum, the two outer ones shorter and more delicate than the apical pair, which are long and convergent.
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Wings (fig. 33) iridescent, slightly tinged with yellow, anal angle not strongly developed; 1st A continued toward margin; Cu2 inclined to evanesce at its junction with 1st A; vein Sc evanescent before reaching costa; veins R4 and R5 fused throughout; M1 and M2 fused; a spurious vein in cell Cu; surface and costa of wing distinctly bristly. Halteres tawny.
Legs tawny and bristly; upper surface of femora and apical joints of tarsi darker; front femora with row of strong bristles on inner side; posterior femora with delicate bristles on lower side and strong pre-apical lateral one; middle tibiae with strong pre-apical bristles and strong lateral one near middle and another on upper side above middle; posterior tibiae with apical bristles and strong one on upper side slightly beyond middle; posterior protarsi rather thickened.
Abdomen blackish-brown, sparsely clothed with short delicate bristles, and a system of long hair-like ones along the posterior margin of each segment.
♂. Length, 3·5 mm.
Holotype: No. 1252, D. M.
Habitat.—Silverstream, Dunedin (E. Clarke).
L. fulvescens n. sp.
♀. Eyes closely approximated along front, deeply emarginate at antennae; ocellar triangle prominent, black with a greyish reflection and a pair of conspicuous ocellar bristles; front narrow but widening slightly to antennae, black, but brownish in some lights, and with greyish pubescence longer at antennae, which are inserted a little above middle height of head; first and second joints of about equal length, black but clothed with greyish pubescence and fringe of bristles; third joint elongate, clavate, clothed with greyish pubescence and terminated by pubescent style not abnormally long nor unusually slender. Face narrow, black, and clothed with a short silvery pile which becomes yellow at oral margin. Proboscis brown, short, and stout; palpi tawny, apical joint broad and ovate. Occiput black, clothed with cinereous pubescence, the hairs below tawny, chaetotaxy above arranged as in fig. 34.
Thorax orange-yellow, vitreous, narrow black streak running from humerus to wing; metanotum blackish-brown. Very few bristles on
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Figs. 24–28.—Trichopeza longipennae n. sp.
24. Wing of ♀.
24a. Wing of ♂, showing stump-vein on R4.
25. Anterior coxa, ♂.
26. Anterior tarsus. ♂.
27. Genitalia, ♂.
28. Apex of abdomen, ♀.
Figs. 29–33.—Leptopeza nigra n. sp.
29. Head, front view, ♂.
30. Antenna.
31. Occiput, ♀, showing chaetotaxy.
32. Dorsum of thorax, showing chaetotaxy.
33. Wing.
Figs. 34–36.—Leptopeza flavescens n. sp.
34. Occiput, ♀, showing chaetotaxy.
35. Dorsum of thorax, showing chaetotaxy.
36. Posterior femur, ♀.
Fig. 37.—Brachystoma adelensis: Wing.
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dorsum, but several systems of delicate hairs, some representing the acro-stichals; but the dorsum is too much damaged by the pin to give a definite account. Chaetotaxy, as far as possible, shown in fig. 35. A unique feature is that on the edge of the notopleurae, just posterior to the humeri, are very minute black teeth-like spines. There is a single pair of erect apical bristles on the scutellum.
Wings with the anal angle more pronounced than in L. nigra; vein 1st A, though weak, is continued well to the margin; venation otherwise as in L. nigra. Halteres brownish on the stalks but with greenish-yellow heads.
Legs tawny; apices of femora, tibiae and proximal tarsal joints, apical tarsal joints, and a spot distally on posterior femora fuscous. Anterior and middle femora slightly thickened, posterior strongly so; middle femora with row of bristles beneath but not extending to apex, and with three lateral pre-apical bristles, two on one side and one on the other; posterior femora with row of stout spines beneath (fig. 36), to one side, each, spine arising from a prominence along which tibiae close, and with pre-apical bristles and bristle-like hairs above. Anterior tibiae clothed with delicate hair-like bristles; middle tibiae with delicate bristles and apical ones; posterior tibiae more delicately bristled and with a stronger pre-apical one.
Abdomen orange-yellow, posterior margin of each segment broadly banded with brownish; apical segment terminated by a long narrow process which has black rounded apex giving rise to pair of long delicately-bristled styles.
♀. Length, 4·5 mm.
Holotype: No. 1254, D. M.
Habitat.—Otira (J. W. Campbell).