TACHINIDAE OF AUSTRALIA 51 



holoptic (although eyes sometimes very strongly approximated and frons then 



very reduced), facets not obviously enlarged (except in Palpostomatini) . . 2 



Epistomal region of the head prominent, visible in profile projecting in front of 

 the vibrissae (sometimes head strongly subnasute) (Text-figs 41-46). Vibrissae 

 inserted at a level well above the epistomal margin (only slightly above in some 

 Leskiini). Abdominal sternites at least partially exposed between the ventral 

 ends of the tergites (except in Leskiini) (as in Text-fig. 20) .... 3 



Epistomal region of the head not prominently projecting, invisible in profile 

 (Text-figs 32-38). Vibrissae inserted about on a level with the epistomal margin 

 (undeveloped in some forms). Abdominal sternites concealed by the overlapping 

 ends of the tergites (except in Myiotrixini) ....... 7 



Abdominal sternites concealed by overlapping tergite ends (which meet in mid- 

 venter). Scutellum with two pairs of marginal setae (basals and subapicals), 

 without apical setae (except in Demoticoides which has apical setae in addition). 

 Humeral callus usually with two or three setae . . . LESKIINI (p. 67) 



Abdominal sternites at least partially exposed, ventral ends of the tergites not 

 meeting in the mid-venter. Scutellum with three or more pairs of marginal 

 setae (including a strong crossed apical pair). Humeral callus with four or 

 more setae ............. 4 



Hind coxa with long fine hair on the posterodorsal surface. Eyes bare. Para- 

 facials haired. Four post dc setae ...... TACHININI (p. 74) 



Hind coxa bare on the posterodorsal surface. Eyes haired, or if bare [Amplntropesa 

 and Neximyid) then parafacials also bare. Parafacials bare or haired. Three 

 or four post dc setae ........... 5 



Hind tibia without a pv apical seta. Two post ia setae (weak third present in 

 Anstralotachina) . Postabdomen of $ very large, tergites 6 and 7+8 forming 

 an exposed vertical declivity at end of the abdomen. Scutellum with three 

 pairs of marginal setae (except Australotachina with four). Bend of vein M 

 without an M 2 fold or spur-like appendix. Mid tibia without a submedian v 

 seta in (J, with such seta in §. Parafacials bare . . PARERIGONINI (p. 71) 



Hind tibia with a pv apical seta (except in Amphitropesa). Three post ia setae. 

 Postabdomen of £ not of this form, tergites 6 and 7 + 8 not externally visible 

 or only T7 -f- 8 just visible when hypopygium in situ. Scutellum with four or 

 more pairs of marginal setae. Bend of vein M usually with a trace of an M 2 

 appendix or fold. Mid tibia of both sexes with a submedian v seta. Parafacials 

 bare or haired ............ 6 



Palpi very reduced, often minute or virtually absent (very much less than half as 

 long as the mentum). Parafacials haired (except in Linnaemya). Eyes densely 

 haired. Three post dc setae LINNAEMYINI (p. 72) 



Palpi moderately or fully developed (at least half as long as the mentum of the 

 proboscis). Parafacials bare. Eyes bare or haired. Three or four post dc setae 



ERNESTIINI (p. 70) 



Sternites of the abdomen fully exposed. Vibrissae absent. Head profile as in 

 Text-fig. 40. Lower ends of the facial ridges expanded into a pair of broad 

 flattened and rather evenly haired facialia, and the epistome reduced to a long 

 narrow strip between the facialia connecting the oral margin directly with the 

 face in the same plane. Scutellum with two pairs of marginal setae (basals and 

 subapicals), without apical setae ..... MYIOTRIXINI (p. 55) 



Abdominal sternites concealed by overlapping ventral ends of the tergites (which 

 meet in the mid-line of the venter). Vibrissae present (but sometimes weakly 

 differentiated from the peristomal setae, especially in Palpostomatini). Head 

 profile not as in Text-fig. 40. Facial ridges and epistome of different form. 

 Scutellum usually with at least three pairs of marginal setae (two pairs only 

 in Palpostomatini and some Minthoini) ........ 8 



