68 R. W. CROSSKEY 
which occupies the anterior two-thirds of tergite length; similar but narrower band on each side 
of T4 occupying only about half tergite length; large metallic area on each side of the black 
median vitta on T5 which occupies most of side of tergite and extends forwards to abut directly 
against hind margin of preceding T4. All abdominal hair black; dorsal hair recumbent on 
Tr + 2 to T4 (at most a little erect hair anteromedially on T3 and hairing of hind margin of 
T4 semi-erect as usual). Genitalia (Text-fig. 76): Surstylus in profile rather slender and simple 
(without trace of process on anterior edge), cerci in profile conspicuously bulbous medially 
and rather abruptly narrowing into the long, slender and rather straight apical part. Measure- 
ments. Large species, body length about 16-17 mm, wing length about 15-16 mm. 
(2. Not positively associated. Specimens in BMNH collection believed to be probably 
females of imperialoides have following features: Generally darker than g with dark greenish 
colour of mesonotum less conspicuous because of stronger development of thick white pollinosity 
combined with very heavy black vittae; white pollinosity thick and conspicuous over humeral 
calli, supra-alar spots, three longitudinal lines on prescutum (between and on outer side of 
the submedian black vittae), over notopleuron and on a small spot on extreme outer edge of 
prescutum. Calyptrae more infuscate than in g, opaque white base of upper calypter there- 
fore more conspicuous. Abdomen very black with deep gold-green or cupreous metallic spots 
or areas as follows: transverse strip on each side of T1 + 2; pair of submedian and pair of 
lateral spots on T3; pair of very small (much smaller than those on T3) submedian spots and 
pair of lateral spots on T4; very large subtriangular metallic area on each side of T5 which 
does not reach forwards as far as the hind margin of T4 (i.e. separated from latter by a narrow 
strip of black ground colour). Metallic spots on each side of T3 sometimes partially or com- 
pletely coalesced into a transverse band across each side of tergite. No proclinate orbital setae. 
Vertex 0-26 of head-width. Hind tibia with one or two small pd setae. Averaging larger than 
6, body length about 17-19 mm, wing length about 16-18 mm.] 
MATERIAL EXAMINED 
Holotype g, AuSTRALIA: New South Wales, Wee Jasper, xii.1g20. In British 
Museum (Natural History), London. 
Paratypes. AUSTRALIA: Ig, same dataas holotype. 1, Victoria (F. du Boulay). 
Both paratypes in British Museum (Natural History). 
In addition to the g holotype and paratypes cited above I have seen four female 
specimens in the BMNH collection which probably are conspecific. However, as 
positive association of these females with the males cannot be made at this time I 
exclude them from the type-series. Their data are: 1 9, Victoria, Monbulk, 1895; 
I 9, Victoria (C. French) ; 1 9, New South Wales, Katoomba, Blue Mts, 3000-3300 ft, 
1.1912 (Dodd junior); and 1 9, Australian Capital Territory, Paddy’s River, 2.ii.1955 
(Paramonov). 
DISTRIBUTION. South-eastern Australia including Victoria, New South Wales 
and Australian Capital Territory. 
AFFINITIES. During the present revisionary work it was found that two quite 
distinct forms of genitalia were found amongst males of the supposedly single species 
previously identified by authors as Rutilia imperialis Guérin-Méneville. In one 
form (Text-fig. 75) the surstylus has a blunt submedian prominence on the anterior 
edge and the cerci in profile are very slender and have the apical part bent slightly 
forwards; in the other form (Text-fig. 76) the surstylus is much narrower and 
completely lacks any trace of a prominence on the anterior edge, and the cerci in 
profile are very distinctly bulbous medially with a rather sudden contraction to the 
straight slender apical part. This difference can be recognized immediately the 
