Tachinidae. 69 



— Discai angle without veinlet or fold 23. 



22. Elongate species with two black stripes on thorax, 

 abdomen black, extensively red on the sides, and 

 red f emora ; first posterior cell closed and cubital 



vein with bristles to near medial cross- vein ... 137. Mintho. 



— Less elongate species with four stripes on thorax, 

 abdomen not extensively red and legs black; 

 first posterior cell open and cubital vein with 



bristles only at base 83. Tachina. 



23. Abdomen with discai bristles, also present on 



third segment 24. 



— Abdomen without discai bristles, at all events 



on third segment 29. 



24. Subcostal and cubital vein with bristles 25. 



• — Only cubital vein with bristles at base or longer 



backwards 26. 



25. Arista bare, cubital vein with bristles in whole 



length 129. BitJda. 



— Arista plumose; cubital vein with bristles only 



half way to medial cross- vein 136. Thelaira. 



26. Exca vation on second abdominal segment reach- 



ing the hind margin (except in Lydella angelicae) 27. 



■ — Excavation on second abdominal segment not 



reaching hind margin 128. Pseudodemoticus. 



27. Second abdominal segment without marginal 



bristles 127. Demoticus. 



— Second abdominal segment with marginal bristles 28. 



28. Claws and pulvilli elongated in male; third 



antennal joint thrice as long as second 62. Lydella. 



— Claws and pulvilli small in both sexes or only 

 slightly elongated in male; third antennal joint 



about four times as long as second or longer . . 61 . Ceromasia. 



29. Proboscis very long and thin 125. Aphria. 



■ — Proboscis of normal length 30. 



30. Male with one or two, female with two orbital 

 bristles; arista thickened in basal two thirds; 

 first posterior cell closed at margin; species 



about 12 mm 60. Masicera. 



— Male without, female with two orbital bristles; 

 arista thickened at most in basal half; first 



posterior cell open; species at most 8,5 mm ... 63. Erycia. 



31. Bright metallic coloured species 32. 



— Not bright metallic coloured species 33. 



32. Cubital vein with bristles to near medial cross- 



vein; palpi yellow; arista distinctly pubescent. . 96. Chrysosoma. 



— Cubital vein with bristles only at base; palpi 



black ; arista bare 93. Gymnochaeta. 



33. Palpi rudimentary 34. 



