ORTHORRHAPHA 



BRACHYCERA 



Empidae 



Dolichopodidae 



Lonchopteridae 



Fig- 53- Empis tessellata F. At rest, 12 mm. to 

 extremity of wing. Common on hawthorn blossom. 

 Predatory insects, the imagines seizing other insects, 

 from which they suck the juices. They are decidedly 

 beneficial ; for examples see Prof. Poulton's " Pre- 

 dacious Insects and their Prey" on Empidae and 

 their Prey, Trans. Entomological Society of London^ 

 1907. 



Fig. 54. Hilara maura F. $ 4-5 x 1 1 mm., $ 4 x 

 IO'5 mm. In swarms on Bourn Brook, Grantchester. 

 (N. D. F. Pearce.) Intense dark brown to black 

 throughout. has forelegs dilated. The Hilarae 

 feed on small insects, especially flies, but also 

 Aphides. They assemble in swarms, and dance 

 about in the air, especially over streams and pools. 

 (Theobald.) 



Fig. 55. Chrysotus neglectus W. $ 3 mm. 17 vi. 

 1907, Studland. An iridescent green fly with pale 

 buff-coloured legs. N. Forest. (Adams.) 



Fig. 56. Lonchoptcra lutea Pz. $3x8 mm. 24 vii. 

 1890, Harlesden. The $ has different venation. A 

 brown fly, with legs of lighter hue. 



