16 



BRITISH FLIES 



cubital fork wide open and including the wing-tip ; fourth 

 posterior cell always bluntly closed ; squanife absent. 



II. ACANTHOMERID^ 



(not European). 



Fig. 30. — Acanthomera Ileydeni 9- x 1}. 



7 (6) Moderate-sized flies. Third antennal joint rarely annulated. 

 Tibiffi always spurred on the posterior pairs, and some- 

 times on the front pair. Prcefurca always starting con- 

 siderably before the base of the discal cell ; cubital fork 

 usually long and bell-mouthed, and usually includino' tlio 



Fro. 37. — Lcfi/v.-J .--'('oZojKKv Y( S. x 3. 



wing-tip ; fourth posterior cell very rarely closed, and then 

 only in a point near the wingmargin. Posterior cells five, or 

 very rarely (Hilar i7norpha) four; anal cell sometimes just 

 open at the wingmargin ; thoracal squamte absent. Legs, 



