DURHAM DIPTERA. 211 



XXXI. 



27 (28). The second-last aristal joint much lengthened, and 



much longer than broad; wings blunt at the tip, 

 or the proboscis long and far protruding. 



Demoticus, Mcq. (370) 



28 (27). The second-last aristal joint not lengthened, and 



scarcely longer than broad ; proboscis normal.^ 



29 (30). Antennae almost as long as the face, the second joint 



much lengthened. Tachina, Mg. (349) 



30 (29). Antennas scarcely reaching the middle of the face, 



second joint not lengthened. 



31 (32). Frons broad and inflated, with very short weak 



bristles ; wings comparatively short, scarcely 

 reaching beyond the end of the abdomen. 

 422. Miltogramma, Mg. (1884. punctaium, Mg.) 



32 (31). Frons not inflated, bearing long and strong bristles; 



wings comparatively long, and reaching far over 

 the end of the abdomen. 



33 (34). Arista bent ; abdomen much arched. 



Trixa, Mg. (403) 



34 (33). Arista straight; abdomen scarcely arched, often 



pressed flat. 

 427. Macronychyia, Rnd. (1894. agrestis, Fin.) 



35 (26). The third antennal joint at least three times as long 



as the second. 

 36(41). Abdomen oval; the longest facial bristles close to 

 the upper edge of the mouth ; wings not blunt at 

 the tip ; the second-last aristal joint not lengthened. 



37 (38). Hind tibiae with an even row of short bristles on the 



outer side. 

 346. Blepharipoda, Rnd. (1704. scutellata, Dsv.) 



38 (37). Hind tibiae with bristles of unequal length, among 



which a few long bristles are specially prominent. 



39 (40). Discal bristles absent on the middle abdominal 



segments. Masicera, Mcq. (335) 



40 (39). Both discal and marginal bristles present on the 



middle abdominal segments. 



Ceromasia, Rnd. (336) 



