[7] On some African species of the Subfamilies Exothecinse etc. 439 



species may be known from the type of the genus (serrata) 

 by structural points; e. g. in serrata the apieal abscissa of 

 the radius and the basal abscissa of the cubitus are both 

 roundly curved towards the costa, while in the present 

 species they are curved and oblique; at the apex of the 

 longitudinal keels on the base of the abdomen in flavipes 

 there is a transverse furrow; in serrata a keel. Hence 

 flavipes has a 2-segmented abdomen, while in serrata (as 

 Ihave stated in the generic description 1. c.) the abdomen 

 forms one piece. There is a deep depression at the 

 base of the scutellum, divided in the middle by a 

 narrow keel. 



Trigastrotheca nigricomis, sp. iioy. 



Luteous, the antennse and ocellar region black; the 

 wings hyaline, the costa and stigma black, the nervures 

 pale fuscous; the 2 nd cubital cellule shorter than the l 8t , 

 narrowed in front, the l st abscissa of the radius, if any 

 thing, longer than the l 8t transverse cubital nervure; the 

 3 Td abscissa of the radius is as long as the basal 2 united; 

 the middle lobe is hardly developed, the space between 

 the outer lobes being almost transverse; the outer ones 

 are oblique and smooth on the inner side, the rest broadly 

 rounded, serrated closely; the 5 th segment is a little 

 longer than the 4 th ; the 3 rd is shorter than it or the 

 4 th . $ 



Length 4 mm; terebra 1,5 mm. 

 Cape Colony (Krebs). 



Face finely rugose, a wide furrow or fovea on either side 

 of the top of the clypeus; the front and vertex finely granulär; 

 the former with a furrow down the middle. Pro- and meso- 

 notum granulär; the metanotum closely, finely, but distinctly 

 rugosely punctured and with a somewhat white furrow on 

 the basal half. Abdomen closely, rugosely punctured, much 

 more strongly than the metanotum; the punctures are inter- 

 mixed with longitudinal strise; some of the punctures are 

 golden. The keels on the centre of the post-scutellum 



