Bremia oreas ( Skuse, 1888 ) Skuse, 1888

Kolesik, Peter & Gagné, Raymond J., 2016, Revision of early taxa of Australian gall midges (Diptera: Cecidomyiidae), Zootaxa 4205 (4), pp. 301-338 : 311-312

Bremia oreas ( Skuse, 1888) , new combination

[ Fig. 6 ]

Cecidomyia (Diplosis) oreas Skuse, 1888: 107 .

Material studied. Holotype male ( ANIC 29-38493 ), “ Glenbrook , Blue Mountains (Masters). January ”. The type has all body parts preserved except last ten (out of 12, see below) flagellomeres of each antenna, and tarsomeres of both frontlegs, one midleg and one hindleg.

Description. Wing 2.3 mm long, 0.8 mm wide; R4+5 slightly bowed at distal fourth, joining C near wing apex; C broken at juncture with R4+5; Cu forked, reaching wing margin; Rs strong, situated half way between end of R1 and arculus; wingfold reaching wing margin; CuP present, fading close to Cu branching point. Head with long occipital protuberance, eye bridge 14 facets long. Palpus 4-segmented; first segment shortest, second and third subequal, fourth longest; palpiger present. Flagellomeres 12 ( Skuse 1888); binodal, each with 3 circumfila; basal and distal circumfila with equally long ventral and lateral loops, with one especially long dorsal loop nearly twice length of flagellomere flanked by short loop on either side; middle circumfilum bandlike. First tarsomeres with small, densely microtrichose ventrodistal lobe; claws strongly bent before midlength, simple on midleg and hindleg, forelegs missing on type specimen, empodia shorter than claws. Terminalia: gonocoxite with densely setose medial lobe; gonocoxal apodemes separate; gonostylus slightly bulging and microtrichose basally, narrow, glabrous, carinate and sparsely setose beyond, tooth comb-like; aedeagus short, robust, tapering, with several asetose ventroapical papillae; cerci large, slightly tapering; hypoproct longer than aedeagus, broadened apically into 2 separate, tapered, diverging, completely microtrichose lobes, each with short setae apically.

Remarks. The male terminalia of this species differ substantially from those of B. actiosa as can be seen by comparing Figs 5 and 6 . In particular, B. oreas has a large gonocoxal medial lobe and a bilobed hypoproct while B. actiosa has no medial lobe and an unlobed hypoproct. Bremia actiosa and B. oreas are the first records of Bremia ( Cecidomyiinae : Aphidoletini ) in Australia (see Gagné & Jaschhof 2014). In order to accommodate this genus in the key to Cecidomyiinae genera of Australia and Papua New Guinea ( Kolesik 2014) the following changes are made:

12 Head without occipital protuberance. Eyes with facets farther apart laterally............................ Diadiplosis Felt - Head with occipital protuberance; eye facets as dense laterally as elsewhere.......................................13 13 Male flagellomeres each with three circumfila; the middle one bandlike, without loops. Female cerci with dense group of short setae ventrally............................................................................. Bremia Rondani Cosmopolitan , 2 spp., B. actiosa (Skuse) and B. oreas (Skuse) , caught in flight.

- Male flagellomeres each with two or three circumfila; if three circumfila present, the middle one with definite loops. Female cerci without dense group of short setae ventrally........................................................... 14 14 Tarsal claws curved or strongly bent near basal third.........................................................15 - Tarsal claws bent at or beyond midlength.................................................................. 16 15 Tarsal claws thin, curved at basal third. Female flagellomere necks with microtrichia............. Mycodiplosis Rübsaamen - Tarsal claws robust, strongly bent at basal third. Female flagellomere necks without microtrichia......... Resseliella Seitner 16 Tarsal claws not toothed on hind leg. Male flagellomeres with loops of first and third circumfila greatly unequal in length......................................................................................... Aphidoletes Kieffer - Tarsal claws all toothed. Male flagellomeres with loops more or less equal in length................................17

Figures

FIGURE 5. Bremia actiosa (Skuse). a – h: male; i – j: female. (a) wing, (b) terminalia in dorsal view, (c) claw and empodium (up: foreleg; middle: midleg; down: hindleg), (d) aedeagus in ventral view, (e) palpus, (f) sixth flagellomere in ventral view, (g) sixth flagellomere in dorsal view, (h) top of head with occipital protuberance in dorsal view, (i) sixth flagellomere, (j) ovipositor in ventrolateral view (one cercus missing).

FIGURE 6. Bremia oreas (Skuse). Male. (a) wing, (b) terminalia in dorsal view (partially misfolded), (c) head in frontal view, (d) first and second flagellomere in ventral view, (e) first and second flagellomere in dorsal view. Note: circumfilum on proximal node of first flagellomere was damaged so circumfilum on proximal node of second flagellomere was drawn.