14 Families and (jenera of 



38. Proboscis nuliineiitary, palpi wanting ; first posterior cell usually 



narrowed ; tegula^ usually large. Botflies. (Estuid.e 



Proboscis not rudimentary ; palpi present. . 3!) 



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. Dolichopodid.e 



Second basal cell separated from the discal cell by a small cross- 

 vein (or, if not, not brilliant-colored, predaceous flics, and the 

 face always broad and arched, E p h y d r i n a?. ) 40 



40. Posterior basal cells of wing elongate ; the anal cell closed to- 



ward the margin ; first posterior cell closed or much narrowed 



(except sometimes in Pipunculidas. ) . . . 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. (Co- 



nopidae, pt. ) 43 



Face convex transversely, or with a median ridge; never with a 

 sub-antennal depression. 42 



42. Between the third and fourth longitudinal veins, and sub-paral- 



lel with them, crossing the anterior cross-vein, a spurious 

 longitudinal vein, or, when rarely not present, the first pos- 

 terior cell closed a considerable distance from the border ; 

 eyes never extraordinarily large ; abdomen without bristles. 



Syrphid^ 



Spurious vein never present; first posterior cell never closed 



before the margin ; eyes very large, including the largest 



part of the head ; small species. Pipunculid^ 



43. Proboscis horny, elongate, often folding back near the middle ; 



abdomen never with bristles ; tibiic without terminal spurs 

 (or, if with them, the face with a median ridge, and the pro" 

 boscis folding;) first posterior cell closed or narrowed. 



CONOPID.E 



Proboscis fleshy and not elongate, (or if elongate and slender, 

 with or without a median hinge, the abdomen with distinct 

 bristles, or the bristle of antennae plumose. ) . . 44 



44. Tegulae large ; face with sub-antennal vertical grooves or de- 



pression. (Muscida>calyptratae. ) . 45 



Tegulae small Muscid.*; ac.4lyptrat>ie 



