666 A REVISION OF AUSTRALIAN SPECIES OF GENUS CERCERIS, 



Petiole subquadrate or longer than broad; mark- 

 ings yellow or ferruginous, not orange-red... 13. 



13. Petiole about one-half as long again as broad B. pradura Turn. 



Petiole subquadrate, either a little longer than 



broad or a little broader than long 14. 



14. Enclosed area of the median segment obliquely 



striated almost to the apex C. labeculata Turn. 



Enclosed area striated only in the angles, if at 



all 15. 



1 5. Clypeus strongly porrect at the apex C venu-sta Sm. 



Clypeus scarcely or not at all porrect at the 



apex 16. 



16. Fourth and fifth dorsal abdominal segments 



more sparsely punctured than the basal ones C. sceva Sm. 

 Fourth and fifth dorsal segments as closely 



punctured as the rest 17. 



17. Third dorsal segment black G. antipodes Sm. 



Third dorsal segment yellow and ferruginous C. minuscula Turn. 



Cerceris aurantiaca Sm. 



Cerceris aurantiaca Sm., Ann. Mag. Nat. Hist. (4), xii., p.414, 

 1873,$. 



9. Aurantiaca, f rente circa ocellos, mesonoto, mesopleuris, sterno, 

 segmento abdominali dorsali quarto, segmentisque ventralibus 

 quarto quintoque nigris; alis subhyalinis margins costali infu- 

 matis; clypeo lamina libera, porrecta, arcuata, latitudine multo 

 longiore. Long. 12 mm. 



(J.Femiuse similis; vertice, segmento mediano, segmentoque 

 quinto dorsali etiam nigris; clypeo convex o, latitudine longiore. 



$. Clypeus with the lamina free from the base, arched, twice as 

 long as the breadtli at the apex, truncate at the apex, the sides 

 almost parallel, sparsely but deeply punctured, the apical margin 

 of the clypeus below the lamina very shallowly emarginate. 

 Antennae inserted at least twice as far from the anterior ocellus 

 as from the base of the clypeus, the second joint of the Hagellum 

 distinctly longer than the third. Pronotum not rounded at the 

 angles, mesopleurse without spines. First abdominal segment 

 nearly twice as broad as long; pygidial area about twice as long 

 as broad, the sides nearly parallel, truncate at the apex, the 

 surface very finely granulate ; ventral segments 3-5 with an 



