118 MUSCID^. 



maris conjunct!, approximati, velremoti; fcem. disjunct!. Proboscis 



recta. Palpi flif or mes, vel subclavati. Arista plurnosa, pubescens, aut 



nuda. Alae sat latae, vel angustae ; venae cubitalis, praebrachialis, et 



discalis transversa structura varise. Alulae mediocres vel minutae. 



Body very various in size and breadth, more or less hairy and bristly. 



Colour various, generally dingy, sometimes pale, very rarely slightly 



metallic. Eyes of the male united, contiguous, remote ; of the female 



more or less remote. Proboscis straight. Palpi filiform or subclavate. 



Arista plumose, pubescent, or bare. Wings rather broad, or narrow. 



Cubital, praebrachial, and transverse discal veins of various structure. 



Alulae of moderate size, or small. Abdomen oval, elliptical, fusiform, 



obconical, or linear. Femora and tibiae of the male notched or dentate. 



The variations in structure of the alulae, of the arista, and of 



the wing-veins above mentioned are characters for grouping the 



species, which may be thus divided : 



a. Alulae of moderate size ; lower valve extending much beyond the 

 upper. 



b. Arista plumose, with long hairs. 

 c. Legs black. 



d. Abdomen broad, oval. 



e. Abdomen not distinctly spotted. 

 /. Epistoma not prominent. Species 1-5. 

 ff. Epistoma prominent. Species 6, 7. 

 e e. Abdomen distinctly spotted. Species 8-11. 

 d d. Abdomen narrow, obconical. Species 12-16. 

 c c. Legs partly pale. 



d. Body more or less pale. Species 17-21. 

 d d. Body black, with pale tomentum. 

 e. Discal transverse vein clouded. 

 / Abdomen not spotted. Species 22-24. 

 //. Abdomen distinctly spotted. Species 25, 26. 

 e e. Discal transverse vein not clouded. 

 /. Femora and tibiae tawny. 



g. Scutellum tawny. Species 27, 28. 

 g g. Scutellum not tawny. 

 h. Wings greyish, or limpid. 



i. Fore femora tawny. Species 29-32. 

 i i. Fore femora black. Species 33, 34. 

 k Ji. Wings brown. Species 35. 

 //. Femora black ; tibiae tawny. 

 g. Transverse veins not clouded. 



h. Thorax with four dark stripes. Species 36-40. 

 h k. Thorax with three dark stripes. Species 41. 

 ff ff. Transverse veins clouded with brown. Sp. 42, 43. 

 b b. Arista plumose, with short hairs. Species 44. 



