128 Annals of the South African JSInsenm. 



beyond the transverse basal ; the disco-cubital nervure is unbroken. 

 Transverse median nervure in hind wings broken shortly below the 

 middle. Mesonotum trilobate ; the furrows narrow, but distinct. 

 Mesosternum not bordered by a suture. Head largely dilated 

 behind the eyes ; the occiput roundly incised. Clypeus not separated 

 from the face by a transverse furrow ; there is a large, deep fovea on 

 either side ; it is gradually narrowed to a point at the apex, which 

 forms a blunt tooth. Mandibles short, broad ; there are two stout, 

 equal teeth. Metanotum depressed in the middle ; the apex with 

 irregular keels ; the spiracles large, linear. Legs long, slender, the 

 hind metatarsus as long as the other joints united ; the fore tibiae are 

 not narrowed at the base ; the four anterior claws are not pectinated 

 at the base ; the posterior stouter, more curved and simple. Ptero- 

 stigma long, narrow ; the sub-discoidal nervure originates below the 

 middle of the discoidal. 



The known species of this genus are large, stout-bodied rufous and 

 black insects, with fuscous or fuscous and yellow wings. Their 

 systematic position is not quite clear. They have some of the cha- 

 racteristics of the Xoridini, but they differ in the form of the first 

 abdominal segment and in the position of the spiracles on it. I feel 

 inclined to refer them to the Hemigastcrini, a tribe of the CryiHince^ 

 which has, like my genus, no areolet in the fore wings ; but the group 

 in question agrees with the other Gryptince in the species having a 

 furrow bordering the mesosternum : this furrow is absent in Ctenotoma. 



The three species known to me may be separated by means of the 

 following table : — 



a. Wings fuscous, except for two or three small hyaline clouds at 

 the stigma. 



Abdomen and hind legs black ; the occiput yellowish fiiscipennis. 



Abdomen and hind coxae, trochanters and femora red ; the 



occiput black nifjriceps. 



b. Wings fuscous, the base broadly yellow ; the apex of abdomen 

 broadly and the hind tibiae and tarsi black ruficeps. 



Ctenotoma fuscipennis, sp. nov. 



Kufo-testaceous, the face paler, more yellowish in tint ; the 

 antennae, front and vertex, the greater part of the outer orbits; the 

 abdomen, except the basal segment and the hind legs, black, the hind 

 coxae obscure rufous in the middle above, wings fuscous, with three 

 hyaline spots. $ . 



Length 23 mm. 



Natal. Estcourt, 



Head and thorax densely covered with pale fulvous pubescence. 



