64 
Io 
II 
I2 
13 
R. W. CROSSKEY 
under microscope). ¢ surstyli and cerci usually differently sais gr very 
similar in chersipho and caeruleata) : 8 
Ground colour of parafrontals dark brown to Pagan ome fread pers e dee 
to naked eye). Genal hair blackish brown. Third antennal segment dark brown 
to brownish black (at most only reddish orange at extreme base). Abdomen of g 
usually showing some tawny brown colouring to naked eye visible — the 
metallic colouring . 9 
Ground colour of parafrontals jallen to reddish oeiare (head es distantly 
yellow to naked eye). Genal hair yellow. Third antennal segment bright 
orange or yellow-orange (slightly suffused with darker reddish colouring in 
occasional specimen or brownish in cvyptica). Abdomen of 3 usually not pgs 
very evident tawny colouring through the metallic colour : 10 
¢ genitalia with surstyli and cerci as in Text-fig. 75; surstylus with a isbn oars 
nence submedially on the anterior edge and cerci in oe slender with the apical 
part bent slightly forwards . : 5 : R. imperialis 
6 genitalia with surstyli and cerci as in Text: fg. 76; _ surstyius rather slender and 
without submedian prominence on anterior edge, cerci in profile rather bulbous 
medially with the apical part more or less straight and narrowed abruptly from 
the bulbous middle part : C R. imperialoides sp. n. (p. 67) 
Mesonotum black or purple-black with a “bold ‘pattern of silver-blue markings as 
follows: pair of lines submedially on prescutum reaching to suture, spot over 
humeral callus, supra-alar spot on scutum, spot on hind part of notopleuron, 
small spot on outer edge of prescutum just mesad of notopleuron (all spots with 
white pollinosity and very shifting appearance). Scutellum not metallic, very dark 
reddish brown (almost blackish brown to naked eye); posteromedian part of 
scutum with dark red-brown colouring similar to scutellum when seen under micro- 
scope (but black to naked eye). Abdomen blackish brown with very strongly con- 
trasting spots or bands of light metallic silvery blue or silvery green; the bands or 
spots widely separated medially and shape of those on T3 and T4 sublunate. 
[Western Australia; g surstylus as in Text-fig. 84] . - s R. chersipho 
Mesonotum without such pattern, ground colour not black but ranging from bright 
brassy green to deep blue-violet, usually with distinct darker vittae (dark 
specimens of caeruleata with deep blue-violet mesonotum may show pair of paler 
blue prescutal lines but if so then scutellum metallic violet also). Scutellum 
metallic, colour ranging from green to violet. Abdominal bands or spots deep 
golden green to violet-blue (rarely pale silvery in caeruleata but then scutellum 
violet); bands or spots of intermediate tergites usually not at alllunate . c II 
Upper two-thirds or more of postorbits silvery white pollinose, sharply contrasting 
in colour with the golden yellow genae and postbuccae. [Eastern Australia] . 12 
All of the postorbits distinctly yellow pollinose, colour of postorbits therefore not 
strongly contrasting with the golden yellow genae and agate re [Western 
Australia] . : 15 
Mesopleuron with distinet white pollinose spot which § is se conspicuous to ‘naked 
eye. Body length usually 14-18 mm (occasional ¢ specimens ares smaller). 
Cerci and surstyli of g of varied form . 13 
Mesopleuron without white spot, entirely setae. Tengen I es mm. ¢ surstyli 
and cerci in profile similar to vubriceps (Text-fig. ee surstyli in posterior view 
similar to splendida (Text-fig. 72) . : ; . R. corona 
3d genitalia with cerci and surstyli as in Text- fie, 74: See of extraordinary 
form, with large forwardly directed tooth-like process and strongly acuminate 
between this process and the apex (the large tooth projecting laterally when 
hypopygium viewed from behind) ; apical part of cerci rather straight and slender 
or at most slightly sinuous, the tip not bending forwards or backwards. Lower 
calypter haired on most of its surface (occasional specimen with hairing only in 
