TJymenoptera. 139 



liave an oblique slope : the part on either side of it is irregularly-, 

 •rftoutly obliquely striated ; the apical slope is sti*aight, oliiique. 

 Propleurae strongly punctured above in front ; the mesopleurse 

 less strongly and more regularly punctured except at the apex 

 below : metapleurae almost smooth. The 2nd abscissa of radius 

 almost twice the length of the 3id : the 3rd cellule in front about 

 one third of what it is behind, it being in front the length of the 

 space bounded by the 2nd recurrent and 2nd transverse cubital 

 nervures ; the upper part of the 1st transverse cubital nervure is 

 obliquely bent ; the 2nd is slightly, roundly bent towards the apex 

 of the wing. Hind coxas black, rufous below ; the upper part on 

 •fhe outer side with a yellow line. 



The genus Geropalei^ appears to be rare in Africa. 



SPHEGIDJ5. 



Trypoxylon foveatum^ sp. nov. 



Black ; the mandibles rufo-testaceous, palpi pale testaceous : 

 '<;alcaria white : wings hyaline, the anterior with a slight fuscous 

 tinge and highly iridescent ; the nervures and stigma black : 

 frontal area large : broadly rounded behind and enclosing the 

 front ocellus : its apex narrowed to a sharp point, the keels there 

 slightlj- curved inwardly, head and thorax covered with longish 

 white pubescence ; abdominal petiole longer than the 2nd and 3rd 

 segments united : last segment ending in a long, curved, stout 

 •spine Female. 



Length 11 mm. 



Eyes distinctly converging below. The frontal area is raised : 

 its sides have an oblique slope outside the keel : inside it is 

 depressed towards the centre where there is an impi-essed line. 

 Eye incision and vertex obscurely punctured ; the face and 

 clypeus covered with silvery pubescence. Area on metanotum 

 raised, depressed in the centre which is transversely striated ; its 

 raised sides rounded ; the paft at its apex depressed : the depres- 

 sion narrowed and rounded at the apex ; the part at the sides of 

 the area with a few irregular transverse stride ; the apical slope 



