22 Famii.iks ANn (iEnkisa ok 



Second joint as long, or but little shorter than the first; wings 

 with a dark picture ; eyes in life with fewer, larger spots. 



• Chrysops 



o. Front of the female as broad as long; callus transverse; front 



tibise a little dilated ; base of third antennal joint not dilated. 



H;»:matopota 

 Front of female narrow. .......(> 



H. Front tibiai very much dilated ; third antennal joint not strongly 

 angulated above. ..... ° Lkpidoselaga 



Front tibiai moderately dilated ; face short. Diachlorus 



Front tibiae not dilated 7 



7. A small ocelligerous tubercle present in the female ; eyes pubes- 

 cent, more distinctly in the male. Thekioplectes 

 Ocelligerous tubercle absent; eyes pubescent. . Atylotus 

 . Ocelligerous tubercle absent ; eyes bare. . Tabanus 



Tangonia Latrelle, Hist. Nat. des Crust, et des. Ins. Ill, 487, 1802. 



Apatolestes Williston, Entom. Amer. I, 12, 1885, 



SiLVius Meigen, System. Beschr! II, 21, 1820. 



Chrysops Meigen, in lUiger's Magaz. , 1803. 



H.^matopota Meigen; in Illiger's Magaz. 1808. 



DiACHLORiis Osten Sacken, Prodr. etc., II, 475, 1876. 



Therioplectes Zeller, Isis, 1842. 



Tabanus Linne, Fauna Suecica, 1761. 



Atylotus Osten Sacken; Prodr. etc. 426, 1876. 



LEFriD^E. 



Rather small to rather large species; thinly pilose, with short 

 thorax, elongate abdomen and large wings. Head short, eyes of 

 male contiguous or approximate; ocelli present. Antennae mostly 

 short, never elongate, the third joint with a terminal or dorsal bris- 

 tle, or terminal slender style. Face small, excavated. Proboscis 

 short; palpi slender, porrect, often bushy pilose. Abdomen elon- 

 gate, broadest toward the base, composed of seven segments ; the 

 female ovipositor pointed. Legs slender, the hind pair somewhat 

 elongate ; some or all the tibife spurred. Posterior cells of wings 

 usually all open. 



Larvae carnivorous, living in earth, decaying wood, dry sand, in 

 moss or in water. The flies are usually found about meadow and 



