124 KANSAS ACADEMY OF SCIENCE. 



5. Wings with only a few longitudinal veins, and no cross-veins; coxfe not elongate, 



tibiae without terminal spurs, legs not thickened; ocelli present or absent; 



small or minute, delicate, mostly gall-producing flies Cecidomtid^ 



Not such flies, wings usually many-veined 6 



6. Ocelli present 7 



Ocelli wanting (compare Myeetophilidce) 9 



7. Wings broad, bare, characteristically marked by numerous folds between the 



veins, giving a netted, spiderweb-like appearance Blepharocerid^; 



Wings not so marked; no entire transverse suture 8 



8. Coxce much elongated (moderately so in Sciarince); antennae often elongate, the 



joints constricted; three or two ocelli (in the latter case situated near the eyes, 



and often hardly perceptible); all the tibiae with spurs MYCETOPHiLiDa; 



Coxae short, the thorax rounded, not humped, above; antennae shorter than the 

 thorax, thickened, the joints closely united without marked constrictions; 

 legs strong, the front femora often thickened; empodia pulvilliform, the pul- 

 villi sometimes absent; eyes of male large Bibionid^: 



9. The costal or marginal vein does not extend beyond tip of the wing 10 



The marginal vein encompasses the entire wing 11 



10. Antennae slender, the joints more or less constricted, and often bushy plumose; 



legs slender, hind tibiae and metatarsi never dilated; body and abdomen slen- 

 der ; wings narrow CniRONOMiDa: 



Antennae shorter than the thorax, the joints broadly and closely united, without 

 marked constrictions, and never hairy or pilose; legs strong, hind pair more 

 or less dilated; body thick-set, abdomen ovate; wings broad, bare, the anterior 

 veins stouter, the posterior ones weak. Black flies, buffalo gnats.. .SiMULiDa: 



11. Wings distally, with ten longitudinal veins, without cross-veins, broad, pointed, 



veins strongly hairy; tibije without terminal spurs; small, lepidoptera-like 



flies, the wings when at rest, folded roof -shaped Psychodid^e 



Wings with small cross-veins near the middle, not broad and pointed, the veins 

 hairy and conspicuously fringed along the hind margin; wings when at rest 

 not roof-shaped. Mosquitoes CuLiciDa: 



12. Third joint of the antennae complex; basal cells of wing long 13 



Antennae composed of three simple joints, the third not annulated or segment- 

 ated, with or without a dorsal arista, or terminal style or arista 19 



13. Empodia undeveloped or bristle-like; antennae elongate, composed of four or 



five joints, without differentiated style or arista; vertex and front hollowed 



out transversely between the eyes; eyes of male never contiguous 25 



Empodia developed pulvilliform; third antennal joint more or less distinctly 

 segmentated or annulated 14 



14. Tegulae rather large; third longitudinal vein furcate; five posterior cells always 



present; the costal vein encompasses the whole margin of the wing; proboscis 

 of the female adapted for piercing; third joint of antenna^ with from three 



to eight annuli, never with style or bristle. Horseflies Tabanid^ 



Tegulfe small or rudimentary; mostly flower-flies 15 



15. Tibiae wholly without terminal spurs 16 



The middle tibim at least, with distinct spurs; the costal vein encompasses the 



entire wing; third longitudinal vein always furcate, and five posterior cells 

 always present 17 



