Empididae. §7 



what narrow, blackish brown stripes; the greyish colour occupies 

 either the whole disc or this is more or less yellow at the sides, the 

 greyish colour here only seaming the stripes outside narrowly or 



Fig. 24. Antenna of E. bilineata. x 55. 



more or Jess broadly, and sometimes this seam is sharply abbreviated 



in front, the yellow colour here suddenly stretching in to the stripe. 



The dorsocentral bristles exceedingly short, uniserial, black; there is 



a very small humeral bristle, one short but strong notopleural bristle 



and a postalar bristle, all black, Scutellum grey, with two small, 



black, marginal bristles at the apex. Pleura yellow, metapleura with 



a few short, black bristles; prothoracic spiracles yellow. Abdomen 



yellow with a blackish grey dorsal stripe which is somewhat dilated 



at the incisures; venter yellow. Abdomen is 



very sparingly clothed with short, pale yellow 



hairs, only at the margin of the first segment 



there are longer and darker hairs. The exterior 



genitalia are large, the lower lamellæ directed 



upwards, the posterior edge, which is turned 



iipwards, is straight and posteriorly drawn out 



into a process; the upper lamellæ are seen 



T_ , ,, 1-1 • x- • Fia. 25. E. bilineata, 



between the upper, anterioriy pomtmg, margms " i o •! r 



of the lower, they leave an almost cylindrical 



opening between them. Penis is thick at the base and with some 



dilatations; it is strongly sinuous, there is especially a loop almo.st in 



the middle, but generally hidden between the lamellæ; it is curved 



upwards and forwards, the apex is not specially thin. The ventral 



lamella has some small spines at the apex. The genitalia are yellow, 



only the upper margin of the upper lamellæ is black; the margins 



and the posterior process have longish, reddish yellow hairs. Legs 



yellow or ferruginous, tibiæ slightly darkened towards the apex, tarsi 



black, paler towards the base; trochanters with the lower interior 



margin black. The legs have short, blackish or brownish hairs, slightly 



longer and very dense ventrally; some few small bristles are found 



on the dorsal side of the tibiæ and at the apex of the femora. Wings 



somewhat yellowish tinged; veins black or dark brown. Stigma very 



faint, yellowish, slightly observable. Squamulæ not haired at the margin. 



Halteres yellow. 



Female. Quite agreeing with the male; the ovipositor black or 



