56 Tachinidae. 



species; more or fewer bristles present; female geni- 



talia often very conspicuous, bent in under venter.. IV. Phasiinae. 



3. Hypopleura bare; no apical cross- vein; squamulæ 



small I. Gastrophilinae. 



— Hypopleura with hairs; apical cross- vein present; 

 squamulæ large 4. 



4. Middle part of epistoma narrow; hypopleura with a 



fan of strong hairs; not pilose species II. Oestrinae. 



— Middle part of epistoma broad, about square; hypo- 

 pleura with a bundle of hairs ; densely pilose species. . III. Hypoderminae. 



5. Second abdominal sternite lying on the lateral mar- 

 gins of the tergite or between them and thus not 

 covered; if this is less or not marked the squamulæ 

 are narrowed {Rhinophor i nae); upper part of post- 

 scutellum not strongly convex 6. 



— Second abdominal sternite more or less to quite 

 covered by the lateral margins of the tergite; upper 



part of postscutellum strongly convex 8. 



6. Exterior posthumeral bristle (often wanting in 

 Engyzops) placed lower than the præsutural bristle, 

 or if not thorax with felted metallic coloured hairs; 

 propleura hairy (except in Pollenia); arista generally 

 long-plumose ; eyes in male approximated or touching, 



in female separated V. Calliphorinae. 



— Exterior posthumeral bristle placed higher than or 

 in the same height as the præsutural bristle; thorax 

 not with felted metallic coloured hairs; propleura 

 bare; arista bare or pubescent or plumose, generally 

 in basal halt; frons in male narrow or somewhat 

 narrower than in female, or equally broad in both 



sexes 7. 



7. Squamulæ of common shape; arista bare or plumose 



generally only in basal half VI. Sarcophaginae. 



— Squamulæ narrow with the inner margin bending 

 away from scutellum (this character wants only in 

 Minella and some species of Macquartia); arista 



pubescent or short-hairy VII. Rhinophor inae. 



8. Antennæ inserted below middle of the eye; arista 

 plumose; no præsutural intraalar bristle; abdominal 



sternites concealed below the meeting tergites VIII. Dexiinae. 



— Antennæ generally inserted at or above the middle 

 of the eye; arista bare or at most pubescent (in 

 Helicohosca and PhyUomyia short-hairy, only in 

 Thelaira plumose); a præsutural intraalar bristle 

 most often present, if wanting. the abdominal ster- 

 nites often more or less visible, otherwise as a rule con- 

 cealed IX. Tachininae. 



