TACHINIDAE OF AUSTRALIA 95 



Head with one pair of reclinate orbital setae (strong and isolated, but 9 sometimes 



with a smaller erect seta ventrad and mesad of the true reclinate orbital) . . 22 



19 Gena conspicuously broad, two-fifths or more of eye height. Facial ridges prominent 



at least lower half well visible in profile. Parafacials about three times as wide 

 as third antennal segment. Three sternopleural setae (exceptionally four but 

 if so not arranged 2 + 2). Basal node of vein i? 4+5 with four or more small 

 setulae. Mid tibia with at least two strong ad setae. Head thickly golden 

 pollinose. Dorsum of thorax bright yellow or golden pollinose with four bold 

 black vittae (inner pair shorter than outer pair) . UGIMEIGENIA Townsend 



- Gena narrow, not exceeding one-sixth of eye height. Facial ridges not visible in 



profile or only just visible immediately above vibrissae. Parafacials less than 

 twice as wide as third antennal segment. Four sternopleural setae (2 +2). 

 Basal node of vein R i , s with one setula (rarely also with one minute super- 

 numerary hair). Mid tibia with one ad seta (except in Zygobothria atropivora). 

 Head not thickly golden pollinose, at most only partially pale yellow. Dorsum 

 of thorax not so ........... 20 



20 Ocellar setae very strong, subequal in size to reclinate orbital setae, inserted slightly 



in front of anterior ocellus. Parafacials totally bare. Mid tibia with one or 



two ad setae ZYGOBOTHRIA Mik 



- Ocellar setae absent or very weak and much smaller than reclinate orbital setae, 



when present not inserted at all forwards of the anterior ocellus. Parafacials 

 finely haired on upper parts (bare in Drino which is not yet positively known 

 from Australia). Mid tibia with one ad seta ....... 21 



21 Parafacials finely haired on upper parts (Text-fig. 51), hair sometimes extending 



slightly on to lower halves, occasionally only a few hairs immediately below 

 lowest frontal setae but parafacials never entirely bare. Ocellar setae present, 

 weak and wiry. Each side of venter of fourth abdominal tergite of $ with 

 well defined hair-patch, usually large and dense with hair very long and converging 

 into a distinct fascicle ...... PALEXORISTA Townsend 



- Parafacials completely bare. Ocellar setae absent. Each side of venter of fourth 



abdominal tergite of £ with unmodified hair or with a large area of short fine 

 close-set hair not formed into a definite fascicle . . DRINO Robineau-Desvoidy 



22 Scutellum with subapical setae inserted very far apart, distance between their 



bases conspicuously greater than that between a subapical seta and its corres- 

 ponding basal seta. Apical scutellar setae very strong, horizontal or almost so, 

 nearly as strong as lateral setae. Four sternopleural setae (2 + 2). Abdomen 

 of $ with a large area of very long dense hair around the sides of T4 



STURMIA Robineau-Desvoidy 



- Scutellum with subapical setae not very widely separated, distance between their 



bases less than or at most subequal to that between a subapical seta and its 

 corresponding basal seta. Apical scutellar setae very weak and directed at least 

 slightly upwards, very much weaker than lateral setae. Three or four sterno- 

 pleural setae. Abdomen of <$ with or without such hair .... 23 



23 Abdomen with last tergite conspicuously small in relation to preceding tergite 



(T5 usually not more than about half as long as T4). Three or four sternopleural 

 setae (normally three in <$ and four in $, but males with four and females with 

 three occur). Lateral scutellar setae very strong, subequal in size to basals 

 and subapicals (often a second pair of laterals developed in addition to main 

 pair). Abdomen of <§ with large area of very dense long hair around sides of 

 T4. Ti + 2 and T3 always without median marginal setae. Larger forms 

 (length 9-15 mm) BLEPHARIPA Rondani 



- Abdomen with last tergite not unusually small in relation to preceding tergite 



(T5 subequal in length to T4 in g, about two-thirds as long in 9) • Four sterno- 

 pleural setae in both sexes. Lateral scutellar setae well developed but distinctly 



