ciu'li scgiiuMit iulo a wide I riiini;ul!ir mark ; li_v tln' poshTiur tiliiw hfiii<» iiiii.h more 

 thickly !Uid strongly ciliated oil their outer sides in lugiihris; and lastly, by the 

 internal transverse vein being plaecd before the centre of the discoidal cell in lugubris, 

 instead of behind it as in dnbhi, and therefore some way before the lenniiiation of 

 the auxilliary vein. 



II. diihia bears considerable reseiiil)l;nice to //. scrva, but may be easily distin- 

 guished by the arista being mueh longer-haiivd in the latter species, and by there 

 being four thoracic setre behind (he suture in dubia and only three in serva. By the 

 light grey colour and dislinet stripes of the thorax, dubia bears a considerable 

 resemblance to II. Icela, but the latter has only three posterior thoracic dorsal 

 bristles as in serva, and pale coloured tibia;. 



fTo b(^ coiilinnedj. 



