424 THE STUDY OF INSECTS. 



and with most of the segments wider than 

 long (Fig. 533); wings very broad (Fig. 534). 



p. 451 SIMULIID.E. 



KK. Antennae either bushy, being densely 

 clothed with long hairs or slender with nar- 

 row segments ; wings narrow or moderately 

 broad. 



L. Wing-veins well developed on all parts of 

 the wing. 



M. Vein IIIj ending at or near the end of 

 the second third of the costal margin. 



p. 449 ORPHNEPHILID^E. 



MM. Vein IIIi ending on the outer margin 



of the wing (Fig. 509). p. 436. .DixiD^E. 



LL. Wing-veins much stouter near the costal 



margin of the wing than elsewhere (Fig. 



517). p. 440 CHIRONOMID.E. 



CC. Antennae either consisting of four or five distinct segments 

 or consisting of five or more segments, with those beyond the 

 second more or less closely consolidated so as to appear as a 

 single segment consisting of several subsegments (Figs. 489, 490, 

 492, and 537) ; cell VIII closed by the coalescence of the tips of 

 veins VII 2 and IX, or greatly narrowed at the margin of the 

 wing ; palpi rarely elongate, and composed of from one to three 

 segments. 



D. Antennas consisting of four or five distinct segments, 

 empodia wanting or bristle-like. 

 E. Vein Ilia not curved forward towards the costal margin 



of the wing (Fig. 559). p. 460 ASILID^- 



EE. Vein Ills curved forward towards the costal margin o< 



the wing (Fig. 561). p. 461 MIDAIDA. 



DD. Antennas consisting of five or more segments, but with 



those beyond the second more or less closely consolidated , 



empodia resembling pulvilli in form (Fig. 495). 



E. The branches of vein III crowded together near the 



costal margin of the wing, and the first cell V 2 unusually 



short and broad (Fig. 545). p. 455 ...... STRATIOMYIID^E. 



EE. Venation of wings normal. 



F. The alulets large, p. 453 TABANID^E. 



FF. The alulets small or wanting, p. 456 LEPTID^:. 



BB. Antennae consisting of not more than three segments ; the 



