392 



larger; the flagellum brownish red, black above. Mandibular teeth 

 black. Mesonotum with 3 distinct black lines, narrower than the 

 central yellow part and slightly narrower than the base of the 

 outer; the central line is the longer, it reaching to the scutellum, 

 where it is clearly narrowed, the narrowed partdilated at the apex. 

 There are 3 arese on the metanotum ; the central becomes widened 

 at the top of the apical scape, the keels running there on to the 

 outer ed'ge ; the latéral basai areœ are as long as they are wide 

 at the base; the basai half of the inner keel is almost straight, the 

 lower obliquely sloped downwards towards the outer side ; the outer 

 keel is ronnded, at the base, the apex obliquely sloped inwardly, the 

 outer side being thus longer than the outer, l st abdominal segment 

 about twice longer than it is wide at the apex ; it becomes gra- 

 dually, slightly wider from the base to the apex, the sides of the 

 centre of the basai half are margined ; 2 nd not quite so long laterally 

 as it is wide at the apex ; the others are wider than long ; there 

 is a shallow wide dépression across the middle of the 2 nd and 

 3 rd segments, that on the 3' vl not continuous. Tarsi more rufous 

 in tint than the tibi;e ; the hinder of darker colour, almost black. 

 Sheaths of ovipositor slender, black, fuscous at the base below ; 

 they are slightly longer than the hind tarsi. $. 



Length 12 mill. ; ovipositor 3 mill. 



Lukombe, 29 th October (A. Koller). 



Temples broadly, roundly narrowed. Face wider than long, 

 smooth, the middle depressed below, not separated from the cly- 

 peus. Wings clear hyaline, the nervures deep black, the stigma 

 dark testaceous; the areolet oblique, longer than wide, of equal 

 width, receiving the récurrent nervure at the angle ; the récurrent 

 is broadly rounded in front and bears 2 wide bullae ; nervellus post- 

 furcal. Parapsidal furrows only indistinctly indicated at the base. 

 Scutellum stoutly keeled laterally to near the middle, the keels 

 becoming weaker towards the apex. Abdomen twice the length of 

 the thorax. The lower part of the scape, face and clypeus closely 

 covered with longish white pubescence, the sides of metanotum 

 more sparsely with longer white hair ; the rest of the body almost 

 bare ; the tibke and tarsi hâve a microscopic white pile. 



Allied to I. trivittata Krieger from Sierra Leone ; only the tf of 

 that species is known. In the présent species the basai central part 

 of the metanotum, if closed at the apex, would form a square ; the 

 latéral at the apex below do not form a sharp angle, but are 

 rounded. The eyes converge slightly, but distinctly below so that 

 the face is narrower below than above. 



