Mr. 11. E. Turner on Fossorial Hymenoptera. 467 



less broadly at the sides and narrowly at the apex yellow. 

 The sixth tergite of the female is very narrow at the apex, 

 more so than in bagandarum, and the second tergite is more 

 distinctly punctured in both sexes than in that species, 

 though less closely than in diodonta. The second tergite of 

 the female is broader than in bagandarum, though scarcely 

 as broad as in diodonta. 



Hub. 30 miles from Magadi Junction, British E. Africa 

 [F. G. Hamilton), May 1912; Marsabit, British E. Africa 

 (C. A. Neave), October 1911 ; east shore of Victoria Nyanza, 

 near Karungu (S. A. Neave), April 1911 ; Ribwezi, British 

 E. Africa, 3000 ft. (S. A. Neave), April 1911. 



It is quite possible that this and bagandarum may prove 

 to be a subspecies of diodonta, but they are quite easily 

 distinguished, and until large collections are available may 

 conveniently stand as distinct species. C. severini, Kohl, 

 is also very uear iu structure. 



Cerceris tricolor, Sm. 



Cerceris bicolor, Sm. Cat. Hyni. B.M. iv. p. 447, uo. 52 (1856). $. 

 Cerceris fossor, Sin. Oat. Hym. B.M. iv. p. 447, uo. 54 (18513). <j\ 



Cerceris andersoni, sp. n. 



$ . Nigra ; mandibulis, apice excepto, flagello, articulis apicalibus 

 supra infumatis, tegulis, segmento abdominali sexto, pedibusque, 

 coxis exceptis, ferrugineis ; clypei lamina macula magua, carina 

 inter antennas ad clypei basiu, facie fascia lata longitudinali 

 utriuque, postscutello, tergitis primo, tertio, quarto quiutoquo 

 fascia augusta apicali, sternitoque tertio macula transversa 

 apicali utrinque Mavis ; alis sordide hyalinis, apice cellulaque 

 radiali infuscatis, venis fuscis, stigmate testaceo ; clypeo lamina 

 porrecta libera ; mesopleuris baud tuberculatis ; sternito secundo 

 area basali elevata nulla. 

 Long. 10 mm. 



$ . Clypens with a porrect lamina, free from near the 

 base, the lamina coarsely punctured at the sides, the apical 

 margin very shallowly and broadly emarginate and nearly 

 equal to the distance from the base of the clypeus to the 

 apex of the lamina ; the clypeus below the lamina smooth 

 and shining, truncate at the apex. Antennae inserted about 

 twice as far from the anterior ocellus as from the base of the 

 clypeus, the second joint of the nagellum less than half as 

 long again as the third. Inner orbits of the eyes almost 

 parallel ; posterior ocelli further from the eyes than from 

 each other. Face sparsely punctured ; head and thorax 



34* 



