74 
R. W. CROSSKEY 
Pleural regions of thorax with pale yellow or golden hair (in bisetosa mesopleural 
hair mainly dark and some dark hairs on SRE Hair of suprasquamal 
ridge yellow : 3 
Pleural regions of thorax wich black an (occasionally some inconspicuous pale yelloe: 
hair on fore margin of mesopleuron, on barette and posteroventral part of ptero- 
pleuron). Hair of suprasquamal ridge black or brownish black (some ae 
of sabvata with some yellow hair intermixed with dark hair) . 6 
Wing base explanate, wings appearing to have strongly developed al ‘shoulders’. 
Colouring distinctive, prescutum and scutum dark green, scutellum violet, abdo- 
men light tawny yellow with sharp black median line. Abdomen with entire 
venter of Tr +2 and mid-venter of T3 pale yellow haired. Surstyli of 5 
genitalia longer and narrower than usual (Text-fig. 65) 
R. agalmiodes (3 only, 2? unknown) 
Wing base not noticeably explanate. Not so coloured, if abdomen rather light 
tawny then mesonotum only very dull greenish and scutellum not violet. 
Abdomen almost entirely black haired (except in analoga). ¢ surstyli of usual 
large wide form (e.g. as in Text-fig. 67) . : : ; : - : 4 
Hair of abdominal T5 pale yellow or golden. Parafrontal hair of g¢ mainly 
yellowish white (black in 9). Mesonotum dull dark greenish or greenish brown 
or sometimes blackish brown in 9, with conspicuous whitish pollinosity, slightly 
contrasting with the tawny (g) or red-brown (?) abdomen; abdomen with distinct 
dark centre line. Parafacials bare or partially haired . . R. analoga 
Hair of abdominal T5 black. Parafrontal hair black in both sexes. Galea varied 
but not as above, whitish pollinosity of mesonotum very inconspicuous. Para- 
facials more or less completely haired . 5 
Pleural hair entirely yellow. First basal oe of ee ete microtrichial 2 
Abdominal T3 without median marginal setae. eae generally dark, 
slightly metallic, greenish blue or violaceous . : : . RR. retusa 
Pleural hair mainly blackish on mesopleuron and Pomretienes on upper edge of 
sternopleuron. First basal cell with microtrichia.2 Abdominal T3 usually with 
a pair of median marginal setae. Colour varying from dark bronze-green to 
coppery brown or blackish brown, sometimes with purplish red tinge on abdomen 
R. bisetosa 
Predominantly green species, colour ranging from light golden green to dark green 
or blue-green. Abdomen with fine dark median line and dark tergite hind 
margins well visible to naked eye . . yy 
Colour not green but ranging from red-brown to piaeke Bega or Ree blac 
sometimes with bronze or coppery purple tinges (rarely slight trace of very dark 
green colour visible but then over an almost black general colour). Dark median 
abdominal line and dark tergite hind margins inconspicuous to naked eye (except 
in § of pellucens) : 8 
Abdomen of g with ground poloue ae eee mete: (T3 ane T4) pale ‘cme 
reddish, the tawny colour clearly visible to the naked eye through the metallic green 
or bluish tints (especially as fly is turned); these two tergites also with rather 
thick white overlay of pollinosity which makes them appear distinctly white when 
viewed from behind. ¢ usually 15-17 mm in body length 5 . . R. lepida 
(Q not definitely associated: golden green to blue-green females resembling 
those of vegalis but with elongate third antennal segment (c. 4—5 times as long as 
second segment) appear to be Jepida] 
Abdomen of $ without such appearance, ground colour all dark and intermediate 
tergites with only very thin inconspicuous whitish pollinosity basally, abdomen 
therefore appearing a pure golden green to blue-green (occasional specimen 
coppery green). ¢ usually 17-19 mm in body ‘enyth : : : . R. regalis 
{Females of golden green to blue-green colour with antennae of normal length 
