56 Annals of the South African Miiseum. 



and fifth segments and on the apex of the third. Front with a deep, 

 narrow furrow. The transverse median nervure is not quite inter- 

 stitial, being received very shghtly beyond the transverse median ; 

 the recurrent nervure is received close to the apex of the first cubital 

 cellule ; the third abscissa of radius is curved roundly towards the 

 costa, and is longer than the basal two united. 



The position of the transverse median nervure shows an approach 

 to the Exothecini. There is no keel or area on the second abdominal 

 segment. 



The Group of /. xan.thot<to))uis. 



Luteous, the greater part of the head bhick, the mesonotum marked with black. 

 Wings large, the base narrowly yellow ; the middle with small hyaline clouds, 

 stigma luteous ; the hind tarsi and apex of hind tibiae broadly black. First 

 abdominal segment striated, the others closely longitudinally rugosely punc- 

 tured; a small smooth, triangular longish area on the base of the second 

 segment. 



The type of this group differs from rohiistus in having the abdomen 

 shorter and closely punctured, not striated, and the transverse 

 median nervure is interstitial. 



IrHIAULAX X.\NTHOSTOMUS, Sp. nOV. 



Luteous, the head, except the malar space and the oral region, the 

 mesonotum except the apex broadly in the centre, from shortly 

 behind the middle, a mark, longer than wide, on the middle of the 

 prosternum, the apex of the hind tibiae and the hind tarsi, black. 

 Wings dark fuscous, the basal fourth yellowish hyaline ; the stigma, 

 except at the apex, orange-yellow ; an irregular hyaline cloud in the 

 first cubital cellule, a triangular one below the base of the second 

 and one bordering both sides of the second transverse cubital 

 nervure ; the hind wings similarly coloured. 



Length 13 mm. ; terebra 6 mm. 



Cape Colony. King William's Town Distr. ; St. Mathew's. 



Antennal scape thick, oval, about twice longer than wide. Face 

 covered with black pubescence above, below with shorter pale pile. 

 Mandibles testaceous, black at the apex. All the abdominal segments 

 closely, strongly longitudinally striated ; the striae in the centre 

 golden ; suturiform articulation wide (as is also the apical lateral 

 branch), stoutly crenulated ; there is a similar furrow on the third ; 

 the sides of both segments behind the furrows smooth ; the plate on 

 the second segment is small, smooth, longer than wide at the base, 

 gradually narrowed towards the apex ; the fourth and fifth segments 

 have wide crenulated furrows on the apex ; the apical edge of the 



