58 Tachinidae. 



Eyes bare. Antennæ inserted at or generally alDOve middle of the 

 eye; arista bare or short-pubescent. None or one posthumeral bristle 

 (in Lophosia two). Intraalar bristles quite wanting or mucli reduced 

 in number, generally to one, rarely two; a præsutural intraalar 

 bristle never present. One or two, sometimes three sternopleural 

 bristles, rarely none. Propleura bare. Scutellum as a rule with two 

 sometimes three marginal bristles on each side, equal and small. 

 Upper part of postscutellum more or less convex. Abdomen with 

 the excavation on second segment only present at base; fifth segment 

 with only marginal bristles. A ventral membrane present or not. 

 Not rarely a sixth abdominal segment visible in male. The female 

 genitalia are often very characteristic, either abdomen ends with a 

 claw-like ovipositor, or the sixth or (in Freraea) already the fifth 

 segment is more or less long and cylindrical, bent in under venter, 

 generally with a special ventral process and ending with a more or 

 less claw-like piece; in Leucostoma the female abdomen ends with 

 a forceps. In some cases the female abdomen ends simply with 

 retractile segments. As a rule no ventral bristle on middle tibiæ in 

 male, but only in female, rarely present in both sexes, or on the 

 contrary wanting in both sexes. First posterior cell petiolate, closed 

 or narrowly open ; none or very minute bristles at base of cubital vein 

 and no costal spine. Thoracic squamula broad, sometimes very large. 

 The species are parasitic on Rhijnchota and Coleoptera. 



Table of Genera. 



1. Abdomen broad and flat or globose or of more common 



shape 2. 



— Abdomen long and quite cylindrical; transverse 



suture on thorax placed in the middle 12. 



2. Abdomen without bristles 3. 



— Abdomen with bristles 7. 



3. Abdomen globose, the incisures slightly marked 4. 



— Abdomen flattened or elongate 5. 



4. Antennæ reaching to the end of epistoma 7. Gymnosoma. 



— Antennæ reaching only half way to the end of epi- 

 stoma 8. Cystogaster. 



5. First posterior cell petiolate 6. 



— First posterior cell open, discai vein almost not bent 



upwards 12. Freraea. 



6. Scutellum with two marginal bristles on each side; 



abdomen flat 4. Allophom. 



— • Scutellum with a number of marginal bristles all 



round ; abdomen cylindrical 10. Besseria. 



