126 KANSAS ACADEMY OF SCIENCE. 



Third antennal joint rarely without terminal style; four or three posterior cells; 

 the fourth vein terminates beyond the tip of the wing 29 



29. Anal cell narrowly open, or closed near the border Bombylid^ 



Anal cell closed, remote from the border Empid^ 



30. Neuration intricate, the small cross-vein wanting or rudimentary, owing to the 



coalescence of the third and fourth veins for a longer or shorter distance; 

 tibiae without terminal spurs; empodia and pulvilli membraneous, but fre- 

 quently minute Nemisteinid^ 



Neuration not intricate; the anterior cross-vein always distinct; labelhe of pro- 

 boscis fleshy 31 



31. The posterior branch of the third vein terminates before the tip of the wing; 



male sexual organs prominent ApiocEKina; 



The posterior branch of the third vein terminates behind the tip of the wing; 

 male sexual organs small Theeevid^ 



32. Antennpe with a dorsal arista 38 



Antennse with a terminal arista or style 33 



33. Wings pointed, no cross-veins in the middle, the fourth longitudinal furcate and 



united with the fifth; small species Lonchopteeid^ 



Wings rounded at the tip, not lancet-like 34 



34. Second basal cell confluent with the discal cell, not separated by a small vein; 



the auxiliary vein does not terminate in the costa; small, mostly brilliant-col- 

 ored, predaceous flies Dolichopodid^ 



Second basal cell separated from discal cell by a small vein 35 



35. Antennse with a terminal style 36 



Antennas with a terminal bristle 37 



36. First posterior closed {Conopidce, pt., Syrphidoe, pt.) 41 



First posterior cell open EajPiDa: 



37. Head comparatively small; the proboscis usually more or less elongated; alulae 



of wing usually rudimentary Empid^; 



Head as broad as the thorax; proboscis fleshy; alulae distinct Plattpezid^ 



38. Proboscis rudimentary, palpi wanting: first posterior cell usually narrowed; teg- 



ulae usually large. Botflies (Estbids: 



Proboscis not rudimentary; palpi present 39 



39. Second basal cell confluent with the discal cell; not separated by a small vein; 



small, mostly brilliant-colored, predaceous flies; face never broad and convex. 



DoLICHOPODIDi 



Second basal cell separated from the discal cell by a small cross-vein (or, if not, 

 not brilliant-colored, predaceous flies, and the face always broad and arched, 

 Ephydrince) 40 



40. Posterior basal cells of wing elongate; the anal cell closed toward the margin; 



first posterior cell closed or much narrowed (except sometimes in Piptoicit- 



lidce) 41 



Posterior basal cells of wings small; the anal cell always closed remote from 

 the margin 43 



41. Face with sub-antennal vertical grooves or depression. {Conopida', pt.) 43 



Face convex transversely, or with a median ridge; never with a sub-antennal 



depression 42 



