198 DIPTEEA. 



Analytical Table of the Species described or noticed below. 



Second submarginal cell long (that is, its proximal end distinctly "anterior" 

 to the proximal end of the second posterior cell). — None of these 

 species have a thoracic crest, nor an expansion of the costa. 

 Femora dark reddish, with more or less black on the under and 

 front side. 

 Venation abnormal ; the usual stump on the anterior branch of the 

 third vein prolonged so as to reach the second vein. 



Palpi with yellow hair; a few black bristles at the tips . . 1. anomalus, Bell. 



Palpi with black hair 2. sp. ? 



Venation normal; the usual stump on the anterior branch of the 

 third vein not prolonged so as to reach the second vein. 



Abdominal segments 4 and 5 black, with only narrow 

 whitish margins. 



Male : forceps small for an Erax -\ 



Female : segments 6 and 7 white, with a black £■ 3. maculatm, Macq. 



triangle in the middle J 



Abdominal segments 4 and 5 white, with a black triangle 

 in the middle. 



Male: forceps large -\ 



Female : prevailing colour of segments 6 and 7 > 4. triton, sp. n. 



black, with white margins J 



Femora black; palpi with yellow hair 5. rapax, sp. n. 



Second submarginal cell short (that is, its proximal end is " not " anterior 

 to the proximal end of the second posterior cell) . 

 No thoracic crest. 



Palpi with white hair ; costa in the male not thickened .... 6. cinerascens, Bell. 

 Palpi with black hair ; costa in the male thickened and expanded . 7. sp. ? 

 A distinct crest of erect hairs in the middle of the thorax, ending in a 

 more or less distinct tuft of white (sometimes yellowish) hairs in 

 front of and on the scutellum; costa in the male more or less 

 thickened and expanded ; the usual stump on the third vein rudi- 

 mentary in the male, distinctly developed in the female. 

 Femora altogether metallic blackish-green. 



Male : Abdominal segments 5-7 silvery ; no silvery hair, -n 



parted in the middle, on the segments { 



Female : ovipositor equal to about three of the preceding ( j P* n - 



segments J 



Male: Nearly the whole abdomen silvery, with silvery^ 

 hair parted in the middle and combed outwards . . r 



• > 9 SD ? 



(?) Female : ovipositor equal to about five of the preceding f *' ' 

 segments J 



