Diplonevra collessi, Disney, 2011

Disney, R. H. L., 2011, Three new species and a new key to the Diplonevra Lioy (Diptera: Phoridae) from Australia, Zootaxa 2792 (1), pp. 41-50 : 41-43

Diplonevra collessi sp. nov.

( Figs 1 –2 )

This species was misidentified by Beyer as D. nigoscutellata (Malloch) , who evidently overlooked the anterodorsal bristle on the basal half of the hind tibia. It is named after the collector D. H. Colless.

Male. Frons chestnut brown and about as broad as long, without microtrichia and with 60–70 hairs. The anterolateral bristles slightly higher on frons than the antials, and the pre-ocellars a little further apart than either is from a mediolateral, which is slightly lower on frons. A strong pair of supra-antennal bristles. Postpedicels orange brown and their greatest breadths fractionally greater than their lengths. The orange yellow palps almost as wide as postpedicels but about 1.6 times as long as wide, with five bristles at apex and up to 20 small hairs on the lower face. Labrum not quite half as wide as a postpedicel. Thorax orange. Notopleuron with 4 bristles, but the second is much shorter than the rest. Propleuron with 2 bristles in upper half and 3 below and with at least two dozen hairs. Scutellum with 4 bristles with the anterior pair slightly shorter than those behind. Abdominal tergites largely yellow, but T3 to T5 with irregular brown bands towards their lateral margins. The very small hairs are restricted to the hind margins except on T6, which has longer hairs at rear and posterolaterally. Venter yellow with microsetae on segments 2–3 and few small hairs on segment 5. Hypopygium mainly brown apart from yellow cerci and end of proctiger, and as Fig. 1 . Legs yellow apart from brown tip to hind femur. Posterior face of front tibia with a longer spine-like bristle about two fifths of length from base and six smaller posteroventral spines in last third. All five front tarsal segments with a posterodorsal hair palisade. Mid tibia with the normal pair of bristles in basal quarter and a near-dorsal and a posterodorsal hair palisade. Hind femur with hairs below the basal half not differentiated from those of the anterior face and shorter than those of the anteroventral row in the distal half. Base of hind femur as Fig. 2 . Hind tibia with an anterodorsal bristle near the end of the basal quarter and a smaller anteroventral bristle near the halfway point. Wings 3.0 mm long. Costal index 0.48. Costal ratios 8.3: 1.6: 1. Costal cilia 0.05 mm long. Vein Sc obscure and not reaching R1. Hair at base of vein 3 only 0.06–0.07 mm long. Axillary ridge with 3 bristles that are 0.2 mm long. All veins greyish brown. Vein 4 concave towards front until around last quarter. Membrane tinged grey but more brownish near front margin beyond costa and at wing tip. Halteres yellow.

Material. Holotype male, Australia, New South Wales, Otford, Roy. Nat. Park , swept close to surface of rocks & water, 31 December 1962, D. H. Colless (Australian National Insect Collection, CSIRO, Canberra).

Figures

FIGURES 1–2. Diplonevra collesi male: (1) left face of hypopygium; (2) posterior face of base of hind femur. Scale bars = 0.1 mm.