202 Transactions of the South African Philosophical Society. 



especially above, where there is a keel down the middle. On the 

 basal half of the metanotum are two longitudinal keels which con- 

 verge slightly below ; on either side of them, at the base, is a large 

 area, wider than long, obliquely narrowed below, the outer part 

 being the larger ; the apex of the segment is closely irregularly 

 reticulated. Tibiae and tarsi spinose. Apex of mandibles and palpi 

 yellowish testaceous. Abdominal petiole curved, as long as the 

 following two segments united, its apex distinctly dilated, 



Sub-Family TEYPHONIN^. 



Gen. EXOCHUS, Gravenh. 



Exochus ? fuscipilosus, sp. nov. 



Black ; the head and thorax thickly covered with fuscous pubes- 

 cence ; the face below the antennae brownish ; the greater part of 

 the antennae testaceous ; wings hyaline, the stigma and nervures 

 fuscous ; legs bright red. Shining, impunctate. Posterior median 

 area slightly obliquely narrowed at the base ; the petiolar area widest 

 at the base. $ . 



Length 4 mm. 



Cape Colony. Stellenbosch. 



This species is not quite a typical Exochus. I therefore give 

 some structural details. On the metanotum are five areae ; the 

 posterior median is narrowed at the base and confluent with the 

 petiolar ; the apical slope is surrounded by keels ; the spiracular 

 area confluent with the area dentipara. Spiracles on petiole placed 

 close to the base ; petiole with two longitudinal keels on the basal 

 half ; there is no keel on the second abdominal segment. Malar 

 space large. The small spiracles touch the lower keel of the 

 spiracular area. 



Taking this species as typical of Exochus that genus may be sepa- 

 rated from Plesioexochus, described here, as follows : — 



Metathoraeic spiracles elongate, large ; first joint of flagellum 

 much longer than the second ; apex of metanotum with an 

 oblique slope Plesioexochus. 



Metathoraeic spiracles small, oval ; first joint of flagellum as 



long as second ; apex of metanotum with a rounded slope . . E.roclnts. 



PLESIOEXOCHUS, gen. nov. 



Wings without an areolet ; transverse basal nervure received 

 distinctly beyond transverse median ; transverse median nervure in 



