4 26 THE STUDY OF INSECTS. 



J. Third segment of antennae without bristle or 

 style ; vein Vi ending at or before the apex of 



the wing (Fig. 568). p. 465 ScenopiniDjE. 



JJ. Third segment of antennae usually with bristle 

 or style ; vein V x ending beyond the apex of the 

 wing. 



K. Vein VI I 2 extending free to the margin of 

 the wing or coalesced with vein IX for a short 



distance (Fig. 564). p. 463 Bombylid^e. 



KK. Vein Vila joining vein IX far from the 

 margin of the wing, often extending towards 

 the base of the wing (Fig. 569). p. 466. 



Empidid^e. 

 EE. Vein III with not more than three branches. 

 F. Wings lanceolate, and with no cross veins except at the 



base (Fig. 572). p. 469 Lonchopterid^e. 



FF. Wings not of the type represented by Figure 572. 



G. Flies with a very small head; with the thorax and 



abdomen inflated, giving the body a hunchback-like 



appearance, and with the alulets very large. The 



empodia pulvilliform, i.e., with three membranous lobes 



beneath the tarsal claws, p. 458 Acrocerid^e. 



GG. Head of ordinary size or very large ; form of thorax 

 and abdomen various; alulets either large or small. 

 The empodia not pulvilliform, i.e., only two membra- 

 nous lobes beneath the tarsal claws. 

 H. Vein Vila appearing as a cross-vein or curved 

 back towards the base of the wing (Figs. 569, 588). 



I. Antennas with a terminal style or arista, p. 466. 



Empididte. 



II. Antennae with a dorsal arista. 



J. Proboscis rudimentary ; mouth-opening small ; 



palpi wanting, p. 477 CEstriDvE,. 



JJ. Proboscis not rudimentary ; palpi present. 

 K. Head with a suture immediately above the 

 antennae through which the ptilinum is pro- 

 truded and withdrawn (Fig. 587). p. 479. 



MUSCID/E. 



KK. Head without such suture, p. 466. 



Empidid^e. 

 HH. Vein Vila not coalesced with vein IX to such an 



