194 DOLICHOPID^. 



mon to both sexes seem to claim the preference. The British 

 species then may be arranged as follows : — 

 A. Antennae with the second joint transverse. 



B. Colour of the body not metallic, &c. Species 1, 2. 

 B B. Colom' of the body more or less metallic. 



C. Third joint of the antennse elongated in both sexes, linear, not 

 broader than the second. Alula; tipped with black. Species 3. 

 C C. Third joint of the antennas broader than the second, usually 

 elongated in the male. Alula; pale. 

 a. Front blue. 



h. Hind femora unarmed. (Coxae with black bristles 2 : 3 : 1.) 

 c. Coxae all yellow. Species 4. 

 c c. Posterior coxa3 grey outside. Species 5, 6. 

 b h. Hind femora with a spine or bristle in front near the tip. 

 (Coxas with black bristles 3:1:1.) Species 7. 

 a a. Front the same colour as the thorax, or glossed withwlute. 

 d. Hind femora with a single spine in front near the tip. 

 e. Fore tibia with about three minute spines outside. 



Species 8, 9. 

 e e. Fore tibia with a double row of spines outside. 

 /. Arista simple. Species 10, 11. 

 //. Arista capitate in male. Species 13. 

 d d. Femora with more than one spine about the tip. 



Species 13, 14. 

 d d d. Hind femora unarmed. 

 ff. Face white. Species 15. 

 ff g. Face black in the male. 



li. Outer appendages of hypopygium forked. Species 16. 



1i h. Outer appendages of hypopygium simple. Species 17. 



A A. Antennae with the tip of the second joint elongate attenuated, 



received into a deep notch of the base of the third. Alulae tipped 



with black. 



i. Front the same colour as the thorax. Species 18, 19. 

 i i. Front blue. 



k. Hind metatarsus unarmed. Species 33. 



k k. Hind metatarsus armed at the base beneath in the male. 



Species 30, 31. 



k k k. Hind metatarsus armed towards the tip beneath in the 



male. Species 33. 



The fu'st two species form a group remarkable especially for the 



departure from the typical number of abdominal segments in this 



family. The antennsc are not elougated^ the third joint ovate 



acute^ the arista long and slender, nearly terminal, the face narrow, 



yet more so in the male, the palpi ovate, hairy, longer than the 



compressed proboscis, which they cover in front ; the lower orbit 



