TACHINIDAE OF AUSTRALIA 49 



of tergite venters usually weak or hair-like and nearly completely recumbent 

 (not projecting noticeably downwards). <$ sternite 5 atypical (shaped as in 

 text-figs 32 or 33 in Crosskey, 1973) ........ 5 



- Last abdominal tergite with a median depression. Abdominal T3 with a transverse 



row of at least a few, usually many, strong erect spiniform marginal setae. 

 Scutellum distinctly flattened or slightly hollowed before the apex. Suprasquamal 

 ridge bare or haired. Arista micropubescent. Setae of inner ventral ends of 

 abdominal tergites rather strong and directed downwards as well as backwards. 

 £ sternite 5 with normal simple rounded lobes 



subgenus RUTILIA Robineau-Desvoidy 



5 $ sternite 5 very strongly acuminate on each side and provided with a pair of 



submedian downwardly directed protuberances (text-fig. 33 in Crosskey, 1973). 

 Distal membranous part of £ aedeagus exceptionally long and whip-like (about 

 twice as long as the sclerotized proximal part of distiphallus, text-fig. 38 in 

 Crosskey, 1973). Only one post ia seta (exceptionally a small second seta present 

 in front of main one). $ normally without, or with one pair of, proclinate orbital 

 setae. Thorax with distinct white pollinose spots or areas over mesopleuron, 

 sternopleuron, humeral callus and supra-alar areas of scutum 



subgenus GRAPHOLOSTYLUM Macquart 



- £ sternite 5 without such acuminate sides and without submedian protuberances 



(text-fig. 32 in Crosskey, 1973). Distal membranous part of $ aedeagus normal 

 in size, shorter than proximal sclerotized part of distiphallus (text-fig. 37 in 

 Crosskey, 1973). Normally two post ia setae (one only in occasional specimens). 

 9 normally with two pairs of proclinate orbital setae (occasionally one or none). 

 Thorax without distinct white pollinosity and therefore lacking bold white spots 



subgenus MICRORUTILIA Townsend 



6 Last abdominal tergite (T5) with a median depression and a median transverse row 



of strong erect setae. Scutellum usually distinctly flattened and without distinct 

 preapical setae in front of the marginal row. Pteropleural hairing not developed 

 in front of the level of the posterior stpl seta (text-fig. 20 in Crosskey, 1973). 

 Head with dark ground colour, g genitalia with very large broad foliaceous 

 surstyli without pointed tips (text-figs 67-71 in Crosskey, 1973) 



subgenus DONOVANIUS Enderlein 



- Last abdominal tergite (T5) evenly convex across its width, without median 



depression or at most with only a mere trace of apicomedian hollowing: without 

 a transverse row of strong setae, usually only with long fine erect hairing. 

 Pteropleuron haired on the anteroventral part in front of the level of the posterior 

 stpl seta (text-fig. 19 in Crosskey, 1973). Scutellum convex and with an irregular 

 row of small but definite horizontal preapical setae in front of the marginal setae. 

 Head usually with bright yellow ground colour. <§ genitalia with elongate 

 surstyli which end in a sharp pointed tip (text-figs 72-84 in Crosskey, 1973) 



subgenus CHRYSORUTILIA Townsend 



Key to Subgenera of AMPHIBOLIA 



Thorax and abdomen with bold black-and-white pattern. Apical pair of scutellar 

 setae approximately as strong as the other scutellar marginal setae. Lobes of $ 

 sternite 5 simple and rounded on hind margin subgenus AMPHIBOLIA Macquart 



Thorax and abdomen without such pattern. Apical pair of scutellar setae much 

 weaker than other scutellar marginal setae (sometimes absent). Lobes of $ 

 sternite 5 each with a small blunt tooth or prong on inner edge near the apex 



subgenus PARAMPHIBOLIA Brauer & Bergenstamm 



