DIPTEBA. 339 



pitchy; third joint not reaching the cpistoma ; fourth, ffth, and sixth 

 tau-ny : scutcheon and abdomen partly purple ; first segment of the abdomen 

 blackish : second and third coppery purple along the hind borders : legs 

 black: wings almost colourless ; veins black ; prabrachial vein forming a 

 right angle at its flexure, much bent inward from thence to its tip ; lower 

 cross-vein with the two curves, the lower deeper than the upper which is 

 very slight: alulce white. Length of the body 3 lines; of the wings 6 

 lines. 



Canary Islands. 



MuscA BicoLOR, Mas. iV^-i-^'*'^'' - 



Viridis ; abdomen cyaneo-purpureum ; antenna nigra ; pedes picei, tarsis 

 nigris ; alee snbcinerea. 



Dark green, hairy : head ivith a white covering ; facialia ferru- 

 ginous, beset with very short bristles towards the base ; epistoma promi- 

 nent: eyes bare: palpi pitchy : feelers black ; third joint slightly decreas- 

 ing in depth beneath towards the lip, not reaching the epistoma, about 

 thrice the length of the second; sixth feathered with very long hairs : ab- 

 domen bluish purple : legs pitchy ; feet black: wings slightly gray; prae- 

 brachial vein forming a hardly obtuse angle at its flexure which emits a 

 short branch, slightly curved inward near this, straight from thence to the 

 tip ; lower cros-vein with the two curves, the upper deeper than the lower : 

 alulcB gray, with tawny borders : halteres tawny. Length of the body 3^ 

 lines; of the wings 7 lines. 



MlSCA LEUCOCEPHALA. 



i. 



Cyaneo-viridis ; caput argenteum, antice et subtus fulvwn ; abdomen pur- 

 pureo varium ; antenna: picea ; pedes nigri ; alee cinerece. 



Bright bluish green : head with a silvery white covering, tawtiy in front 

 and beneath; frontalia black, linear; epistoma not prominent: mouth, 

 palpi and feelers pitchy ; third joint of the feelers linear, very long, reaching 

 the epistoma, more than four times the length of the second joint ; sixth 

 joint black, tawny at the base : chest with a slight white covering : abdo- 

 men partly purple : legs black ; thighs blue towards the base : wings 

 gray ; veins black ; praebrachial vein fonning a slightly obtuse angle at 



