38 DURHAM DIPTERA. 



III. 



20 (21). Antennae usually long and thin, filiform (II. 6). 



« 



Sub-Family Macrocerin^e. 



58. Macrocera, Pz. 



21 (20). Antennas rather short, and usually rather thick and 



plump. 



Sub-Family Ceroplatin^e. 



22 (23). Proboscis very long, beaklike. 55. Asindulum, Ltr. 



23 (22). Proboscis not lengthened into a beak. 



24 (25). Antennae dilated, palpi not bent together. 



57. Ceroplatus, Bosc. 



25 (24). Antennae not dilated, palpi bent together. 



56. Platyura, Mg. 



26 (9). V.4. branching from V.5. quite close to the base of 



the wing. 



27 (38). V.3. forked, the upper branch usually almost at right 



angles, looking like a X.3., enclosing a small cell. 



Sub-Family Sciophiliisle. 



28 (29). X.4. like the base of V.3., and more than twice as 



long as V.3 1 , which latter and V.3.a. both look 

 like small parallel X-veins enclosing a small 

 rectangular cell. 51. Tetragoneura, Winn. 



29 (28). X.4. not like the base of V.3., not in line with V.3., 



and at most only slightly longer than V.3 1 . V.3 1 

 and V.3. a. not parallel. 



30 (31). Costa reaching only to the end of V.3. 



54. Sciophila, Mg. 



31 (30). Costa always reaching somewhat beyond, and often 



much beyond, the end of V.3. 



32 (33). V.4. forking close to X.4., V.4 2 therefore very short. 



52. Lasiosoma, Winn. 



33 (32). V.4. forking far beyond X.4., V.4 2 therefore very 



long. 



34 (35). V.5. forking below, or before X.4. V.3. always 



straight. 50. Empheria, Winn. 



35 (34). V.5. forking far beyond X.4. V.3, sometimes looped 



or bent. 



