Tachinidae. 65 



VIII. Dexiinae. 



No ventral membrane. Abdominal sternites concealed below 

 the meeting tergites. Frons more or less narrow in male, broad in 

 female. Antennæ inserted below the middle of the eye, not long; 

 arista pliimose and nearly always long-plumose. Cheeks and jowls 

 well developed, broad. Frontal bristles reaching to insertion of an- 

 tennæ, all Crossing, without reclinate bristles; in female an upper 

 outwards directed bristle and orbitals present. Eyes bare. No præ- 

 sutural intraalar bristle; one to three postsutural. As a rule one 

 posthumeral bristle, placed higher than the præsutural, rarely two 

 to three. Generally only two præsutural acrostichals, sometimes a 

 weak third, rarely none. Propleura bare. Upper part of postscutellum 

 strongly convex; most often three, rarely four scutellar marginal 

 bristles on each side, the apical long, crossing. Abdomen with ex- 

 cavation on second segment reaching hind margin except in Dinera 

 and Myiocera carinijrons. Fifth segment with one or two marginal 

 rows of bristles, or with more bristles. 



The species are of elongate shape and with rather long legs. 

 The species for which hosts are known are parasitic in larvæ of 

 Melolontha, Polyphylla and Rhizotrogus. 



Table of Genera. 



1. Proboscis of common shape 2. 



— Proboscis about as long as body, thin and bristle-like ; 



labella small and thin 54. Prosena. 



2. Vibrissal ridges more or less but always distinctly con- 

 verging below, if less, epistoma with a high middle keel 

 in whole length or first posterior cell petiolate; second 

 abdominal segment without bristles 3. 



— Vibrissal ridges not converging below 6. 



3. Vibrissal ridges meeting below somewhat above margin 



of mouth aperture ; no præsutural acrostichals 53. Dexiosoma. 



■ — Vibrissal ridges not meeting below; præsutural acrosti- 

 chals present 4. 



4. Epistoma with a high, sharp median keel in the whole 



length; three postsutural dorsocentrals 52. Dexia. 



— Epistoma less keeled and only above; four postsutural 

 dorsocentrals 5. 



5. Cheeks with fine hairs 50. Syntomocera. 



— Cheeks bare 51. Estheria. 



5 



