ANALYTICAL TABLE OF FAMILIES 



ORDER DIPTERA 



I (141). Insects with the head distinct from the thorax, with one pair 

 of wings, one pair of halteres, 5-jointed tarsi, proboscis not 

 spirally coiled ; with a well defined pupal stage intermediate 

 between the larval stage and the perfect insect. 

 ). Frontal lunule absent. 



SUB-ORDER I. ORTHORRHAPHA (comprising 25 families); 

 flies with "mummy-pupae," see plate VI, figs. 38 and 39. 



2 (25). Antennas many-jointed (plate II). 



NEMATOCERA (thread-horns) 



3 (4). Vein endings round the margin (plate IV, figs. I, 2, 3) not 



more than 6. 



CECIDOMYID/E, II 



4 (3). Vein endings more than 6. 



5 (20). Thorax (plate VI, 31) without B, I, 8 conspicuous. 



6 (15). Costa ending at apex of wing (plate IV, 4-II). 



7 (12). Ocelli as in plate I, or as in plates VI, I and II, 4. 



8 (9). Discal cell (O, 46 or O, 5 2 ) present (plate IV, 16). 



RHYPHID/E, XIV 



9 (8). Discal cell absent (plate IV, 4-7). 



10 (II). Antennae long (plate II, 3-6) ; or, if short, coxae elongated. 



MYCETOPHILID^, III 



11 (10). Antennas as in plate II, 7 and 8 ; coxae not elongated. 



BlBIONID,E, IV 



12 (7). Ocelli absent. 



13 (14). Antennas (plate II, 9) shorter than B; wings (plate IV, 9) 



broad. 



SiMULnxc, V 



14 (13). Antennae (plate II, 10, II) longer; wings narrow (plate IV 



9-II). 



CHIRONOMHXE, VI 



15 (6). Costa (plate IV, 12-14) around hind margin. 



16 (17). Wings held roof-like, hairy ; X only at base (plate IV, 12). 



