XLVII. Family BORBORID^E. 



Rather small to very small, black, brown or obscurely 

 yellowish flies, having a quick, short flight. Head hem- 

 ispherical; vibrissse present ; front broad, usually bristly. 

 Antennae short; third joint rounded or obtusely pointed 

 with a dorsal or terminal, bare or pubescent arista. 

 Wings rarely absent ; auxiliary vein wanting or indis- 

 tinct, never clearly separated; second basal and anal 

 cells often incomplete or absent. Legs moderate^ long 

 and strong; hind metatarsi usually dilated and abbre- 

 viated. 



Fig. 125. Borboridse. 1. Sphcerocera, wing; 2, Limosina venali- 

 cia, wing; 3, Limosina perparva, wing; 4, Limosina perparva, an- 

 tenna; 5, Limosina lugubris, wingj 6, Borborus. sp. wing; 7, Bor- 

 borus, sp. antenna; 8, Borborus, sp. hind tibia and tarsus. 



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