176 Transactions. 



clothed as the dorsum ; 4 large and hairy spines, black toward the base 

 and reddish-brown distally. In one specimen ($) close to the base of and 

 beneath both the 2 left-hand spines is a supernumerary spine not much 

 shorter in length. In the <$ the spines are lighter in colour. Halteres 

 pale grey, sometimes with darker heads. 



Posterior legs much longer than the others, their femora club-shaped 

 being distally thickened, bluish-black but for the whitish proximal part ; 

 the middle and anterior femora not much more than half the length of the 

 posterior, proximally whitish but otherwise of a more brownish black, the 

 knees tending to brown. Posterior tibiae robust but not distally enlarged, 

 bluish-black and proximally whitish ; the remaining tibiae brownish-white, 

 especially distally. Protarsi fully half as long as the whole tarsus ; anterior 

 and middle tarsi brownish-white, darker distally, the posterior of a smoky- 

 grey colour. The posterior protarsus of the S is almost white in colour 

 and ha^ a dark spot at the origin ; the remaining joints are darker. 



Wings deeply clouded with brown between a line through the base of 

 the discal cell and the apex of the wing ; axillary angle not sharply curved. 

 The clear spaces are as follow : the articulation ; costal cell,, except distally 

 at the costa ; 1st basal cell, except the spurious vein when present, and 

 2nd basal cell ; a space across the 1st submarginal cell from the costa to 

 the 3rd vein, the proximal edge of which space being in line with termina- 

 tion of 2nd vein and the distal edge in line with origin of anterior branch 

 of 3rd vein ; 1st posterior cell slightly lighter along the centre ; 2nd to 

 5th posterior cells distinctly lighter in the centre ; discal cell with a faintly 

 lighter space just below the middle line. The anal and axillary cells slightly 

 clouded, the marginal cell very dark, the remainder of the colouring lighter. 

 Costa along the costal cell but slightly outcurved, this cell is thus not 

 widened to any extent ; 2nd longitudinal vein gently curved except distally 

 where it meets the costa ; anterior cross-vein and 3rd longitudinal having 

 a common origin from the 2nd longitudinal, the 1st section of which being 

 about as long as the anterior cross-vein, which is almost straight and a 

 little posteriorly oblique ; 3rd longitudinal distinctly upcurved and in the 

 last section downwards, which is about three-quarters the length of the 1st 

 section (fig. 3) ; in consequence of the curve of the 3rd vein the anterior 

 branch is comparatively short, being twice as long as the anterior cross- 

 vein ; this branch is oblique, arising at an acute angle and more or 

 less distinctly curved to the costa. The 1st submarginal cell is proximally 

 both acute and narrow. Vein between discal and 5th posterior cells 

 straight and about one and a half times the length of anterior cross- vein. 

 A spurious longitudinal vein, sometimes represented by a delicate cloud, 

 along the middle of the 1st basal cell. Of the 4 posterior veins from the 

 discal cell the 3rd reaches three-quarters of the distance to the posterior 

 margin of the wing. The confluence of the 5th and 6th longitudinal veins 

 about three times the length of the anterior cross-vein from the margin. 



The abdomen is elongate, fusiform in the $, linear and restricted along 

 the middle in the $ ; in the former as broad as thorax beyond the middle, 

 but not broader or as broad as the thorax in the latter ; the whole deep 

 shiny-blue with a faint tinge of purple in certain rights. There is a short 

 vestiture of silvery hairs, longer laterally, and so arranged on the posterior 

 margin of each segment as to present a banded appearance. In the $ 

 those bands are more or less brown. The abdomen is 7-segmented. 



The $ genital organs are represented by a pair of 2-jointed tawny styles 

 projecting slightly upwards and arising from the sides of a central dome- 

 shaped tawny plate. 



