1918.] 279 



The venation somewhat resembles that of Hilara, but the branches of tlie 

 cubital fork widely diverge ; the subcostal vein is not thickened towards its 

 end and there is no darkened " stigma" below the tip of this vein ; the lower 

 branch of postical fork is more augulated at its junction with the anal vein ; 

 costal pubescence only microscopic except at extreme base, where there are a 

 few vellow hairs and a strong yellow bristle. The antennae are short ; the 

 first two joints very much fused together, third joint large, ovate, but rather 

 more convex below than above ; style very short, three jointed, the first two 

 joints stout (first joint very short and indistinct), third joint shorter than 

 second and spine-like. 



The eyes are closely approximated though not actually touching on the 

 frons in the male, with the facets of equal size. Proboscis short, normally 

 directed diagonally forwards and slightly projecting. Thorax longer than 

 broad, not much arched, dusted greyish. All bristles and hairs yellowish. 

 Acrostichals short, biserial ; dorsocentrals rather longer, uniserial, ending in 

 2-3 pairs of longer bristles behind ; scutellum with a fringe of yellow bristles of 

 which six are long. Hypopleura bare. 



Abdomen longer than thorax, not very broad, slightly narrowed before the 

 hypopygium, black and shining. Pubescence yellowish, short and scattered on 

 disc, longer on hind margins, especially at sides. Hypogygium globular, shining 

 black with an opening above between the two side lamellae, from the base of 

 this opening two long flattened papillae, placed close together and clothed 

 with short hairs, project upwards ; side lamellae bearing several long yellowish 

 bristles. 



Wings longer than the abdomen ; veins yellowish, those about tip and on 

 lower half of wing faint. Ilalteres yellow. 



Legs simple and rather elongate, dark brownish-black and rather shining, 

 end of coxae, the trochanters, tip of femora, and base of tibiae, yellowish 

 brown, most distinctly so on anterior pairs. Femora short-haired. All tibiae 

 with short yellowish- brown bristles, longest and almost spinose on hind tibiae. 

 Tarsi all slightly longer than their respective tibiae and shori-haired. 



The dusted thorax with its yellow hairs and bristles, together with 

 the shining black abdomen, makes the insect superficially somewhat 

 resemble a species of Tacliydromia, from which, however, it is of course 

 abundantly distinguished by the venation. 



Zetterstedt placed the genus in his Hylotinae (which also included 

 what are now known as the Ocydrominae) between the genera Trichina 

 (which he afterwards called Microplioriis) and Iteaphila. In Kertesz's 

 " Katalog " it is placed in the Empidinae between Iteaphila and RhagaSy 

 followed by Hilara. 



I feel convinced that its correct position is in the Ocydrominae, to 

 which subfamily, indeed, Ehagas should also be transferred ; but 1 hope 

 to deal more fully with this question on some future occasion. 



Finally, my thanks are due to Mr. W. E. Sharp for enabling me to 



