46 
Io 
12 
13 
R. W. CROSSKEY 
Wing with cell R, closed well before the margin and conspicuously petiolate (the 
petiole longer than v-m). Parafacials strongly haired. Three stp/ setae 
GERALDIA Malloch 
Wing with cell R; open to the wing margin. Parafacials bare or haired. Two or 
three stpl setae . : 9 
Parafacials either totally bare or italy ieaed Aneta paeseoas or (Ga Awateatanaueal 
short-plumose. Two or three stp/ setae. Q palpi at most only slightly spatulate 10 
Parafacials strongly haired on the upper half and with two or three minute hairs 
at the ventral end adjacent to the eye, entirely bare medially. Arista long- 
plumose. Three stp/ setae. 9 with extraordinarily large dorsoventrally spatu- 
late palpi (coloured bright orange and conspicuously contrasting with blackish 
head and body). [Moderately large form, length about Io mm, with abdomen 
slightly shining blue-black or violaceous beneath the thin whitish pollinosity] 
[Western Australia]. . : Undetermined gen. 
[One female specimen faut eer ese seen in BMNH] 
Parafacials strongly haired : : : : : - : : : : II 
Parafacials bare : ‘ : é : : 4 : 3 : - - 12 
Three stpl setae. 3 -+ 3 dc setae. Third antennal segment distinctly pointed on 
its outer apex. Bend of vein M further from the wing margin than from m-—cu. 
Humeral callus with several strong setae differentiated (usually 5-7). Palpi of 2 
distinctly spatulate apically . ‘ , . ACUCERA Malloch 
Two sternopleural setae. 3 + 4 dc setae. SThied teed segment evenly rounded 
apically. Bend of vein M nearer to the wing margin than to m—cu. Humeral 
callus with only two strong setae clearly differentiated (only at most one or two 
weak hair-like setae in addition). Palpi of 2 evenly slender. Head profile as 
in Text-fig.30 . : : : : : . PLATYTAINIA Macquart 
Three sternopleural setae. Arista short-plumose. Epistome distinctly projecting 
in front of the vibrissal insertions when seen in profile, vibrissae inserted above 
the level of the epistomal margin. First antennal segment not noticeably 
projecting. Antennae largely bright orange . , ANATROPOMYIA Malloch 
Two sternopleural setae. Arista pubescent. Epistome not projecting when seen 
in profile, vibrissae inserted about level with the epistomal margin. First 
antennal segment prominently projecting. Humeral callus with three or four 
setae standing more or less in line. Antennae not so coloured. HOBARTIA Malloch 
Interfrontal area well developed, wider than a parafrontal in both sexes. Frons 
narrower ing than 9. Arista with very long plumosity (longest hairs exceeding 
the width of the third antennal segment). Hind tibia without fd preapical 
seta. Wing vein R, bare. 4 without reclinate orbital setae 
TRICHOSTYLUM Macquart 
[This genus has very much the habitus of Billaea Robineau-Desvoidy s.l. but 
has the propleuron bare. It differs from Phzlotrvichostylum Townsend by the 
same character, but is otherwise exceedingly similar to this genus] 
Interfrontal area very reduced or completely obliterated, in 29 obviously narrower 
than a parafrontal and in ¢ eliminated by the fusion of the broad parafrontals 
in the mid line of the frons. Frons as wide in gas in 9, much wider than an eye 
in dorsal view. Arista with long pubescence or short plumosity (longest hairs 
much shorter than width of antenna). Hind tibia with a #d preapical seta (in 
addition to the normal ad and d preapicals), though this sometimes very small. 
Wing with vein Ff, bare or setulose. 4 without or with one pair of reclinate 
orbital setae (in latter case these standing very isolated near upper outer corners 
of the wide frontal region) . : HETEROMETOPIA Macquart 
[This genus, although running ont in the same couplet as Tvichostylum above, 
certainly has little or no relationship with Tvichostylum and may not belong in 
the Prosenini] 
4 

