21 

 TABLE OF FAMILIES 



1. Wing-s absent or greatly reduced 91 



Wings present, rarely reduced 2 



2. Antennae composed of six or more freely articulated segments 3 



Antenna composed of not more than five freely articulated segments, 



the third segment sometimes complex, usually bearing a style or 

 arista 22 



3. Mesonotum with an entire V-shaped suture 4 



Mesonotal suture transverse, not V-shaped 7 



4. Ocelli absent 5 



Ocelli present (p. 31) TRICHOCERID^. 



5. Only one anal vein reaches the wing margin 6 



Two anal veins reach the wing margin (p. 33) TIPULID^ 



6. Second and third veins each with two branches (radius 5-branched) 



(TipulidEe plate II, fig. 11) (p. 29) TANYDERID^ 



Second and third veins with only three branches reaching the wing 

 margin (radius 4-branched) (Tipulidae plate II, fig. 12) (p. 30). 



PTYCHOPTERID.^ 



7. Wings without a network of folds or creases 8 



Wings with a network of fine folds or creases (p. 61) BLEPHARICERID^ 



8. Ocelli present 9 



Ocelli absent 14 



9. Costa continuing around the wing, although weakened behind. 



(p. 101) CECIDOMYID^ 

 Costa ending at or near the wing-tip 10 



10. Discal cell present 21 



Discal cell absent 11 



11. Tibiae with apical spurs 12 



Tibiae without apical spurs, though produced spur-like. 



(p. 131) SCATOPSID^ 



12. Eyes more or less connected by a projection above the base of the 



antennse (p. 118) SCIARID^: 



Eyes separated 13 



13. Antennae placed below the compound eyes, usually close to the oral 



margin " "(p. 128) BIBIONIDiE 



Antennae situated at most slightly below the middle of the compound 

 eyes (p. 120) .MYCETOPHILIDiE 



14. Costa continued around the margin of the wings, though weaker behind 



the apex 17 



Costa ending at or near the apex of the wing 15 



15. Wings very broad, the posterior veins weak and poorly developed. 



(p. 63) SIMULIID^ 

 Wings narrow and long, the posterior veins stronger 16 



