94 Oithorrhapha brachycera. 



very long, much longer than the head, black; the first joint much 



elongated, this and the second joint slightly haired with short hairs; 



the third joint slightly longer than the two first together. Thorax 



yellow or reddish yellovv, with three very broad, greyish black stripes, 



the two lateral somewhat abbreviated in front. The dorsocentral 



bristles somewhat short, a little longer behind, uniserial, black. Further 



a humeral bristle, a posthumeral, two notopleural, a supraalar and a 



postalar bristle, all black ; of the notopleural bristles one is somewhat 



weak, and a third, likewise weak, is sorae- 



times present. Sculellum grey with four 



black marginal bristles, the outermost small. 



Pleura yellow, metapleura with black hairs; 



the prothoracic spiracles brown. Abdomen 



yellow, somewhat shining, with a black dorsal 



stripe, dilated at the incisures, and with a 



black stripe at each side, just at the yellow 



venter. Abdomen is haired with short, yellow 



„. Ol T^ 4 • hairs. Exterior genitalia large, the lower 



Fig. 31. E. trigramma, ° ° ' , . j 



male o-enitalia. lamellæ directed upwards, the upper, hmder 



angle drawn out into a small process which 

 is black; the upper lamellæ protrude forwards between the lower, 

 they are somewhat large, about triangular; the lamellæ have short, 

 blackish hairs at the upwards pointing margins, the lower lamellæ 

 have longer, yellowish hairs at the lower (backwards pointing) margin. 

 Penis is slightly thickened at the base, curved upwards and forwards, 

 very long, and thin at the apex; the ventral lamella is more or less 

 visible, the eighth segment with longish hairs at the margin. Legs 

 yellow, tarsi blackish, paler at the base; trochanters and apex of 

 femora with a black point. Legs short-haired, tibiæ with some few 

 small bristles on the dorsal side, and femora with small bristles at 

 the apex on the anterior and posterior side; the hairs blackish or for 

 the most part brownish. Wings slightly yellowish tinged; veins blackish 

 or brown. Stigma yellowish or slightly brownish. Squamulæ with 

 long hairs at the margin. Halteres yellow. 



Female. Agreeing with the male; the ovipositor long, black; the 

 eighth ventral segment drawn out into a long, narrow process. 



Length 4,8 — 5,8 mm. 



The pupa is yellowish, of a length of 5,5 mm.; the two upper 

 of the tubercles on the front side of the head are very small, the 

 lower somewhat knob-shaped with an edge below. 



This species resembles to some degree punctata, but it is easily 

 known by the not grey but yellow ground colour of the thorax, the 



