32 Annals of the South African Museuvi. 



furrows smooth ; the scutellum sparsely, weakly punctured ; behind 

 it is a triangular, depressed area, bounded by sharp keels ; on the 

 lateral depression are four stout keels. Metanotum strongly punc- 

 tured ; in the centre are three stout longitudinal keels, the outer of 

 which extend to the centre; these are united by numerous transverse 

 ones ; on the apical half of the sides are two stout keels, and between 

 ai'e two shorter ones ; the apex on the inner side bears some trans- 

 verse striae ; the apical slope above is bounded by a keel, outside the 

 central longitudinal keels. The three central keels on the abdomen 

 are united by a transverse one at the base ; the space between is 

 closely, strongly transversely striated ; the space outside is stoutly, 

 irregularly transversely reticulated ; the middle is irregularly longi- 

 tudinally reticulated-striated ; the apical third is more closely 

 rugosely punctured-reticulated, with a keel down the apical slope. 



TKIGASTEOTHECA, gen. nov. 



Abdomen with five segments, the first the smallest, the last about 

 as long as the pi'eceding ; it is distinctly trilobate ; the middle lobe 

 shorter and narrower than the lateral, which are broadly rounded 

 and closely denticulate or serrate ; the first segment is short, with a 

 steep basal slope, keeled on the top ; the suturiform articulation is 

 curved, deep, crenulated ; there are similar, but not curved, furrows 

 on the base of the fourth and fifth segments. Median segment short, 

 the sides with a short tooth above the middle ; the middle of the 

 metanotum with a longitudinal keel. Eadial cellule long, narrow, 

 reaching to the apex of the wing. First abscissa of radius slightly 

 shorter than the second ; transverse median nervure interstitial ; 

 the recurrent nervure received in the first cubital cellule ; the second 

 cubital cellule nearly twice longer than wide, of equal width through- 

 out. Eyes bare ; malar space distinct, half the length of the eyes. 

 Anal nervure originates shortly above the middle. Thix'd joint of 

 antennae distinctly longer than the fourth. Ovipositor longish. 



The relationship of this genus is with Gastrotlieca, which may be 

 readily enough known from it by the abdomen not being segmented 

 and bidentate, and by the much shorter basal abscissa of the radius ; 

 Phanerotoma has the abdomen 3-jointed, with the apex entire. 



Trigastrotheca trilobata, sp. nov. 

 Luteous, the antennas and ocellar region black ; wings hyaUne, the 

 costa and stigma black, the nervures pale. Head closely punctured. 



