344 MR. R. E. TURNER ON THE [Feb. 15, 



b. Third abscissa of the radius much less than 

 half as long as the second transverse cubital 

 nervure ; median segment with a stigmal 



sulcus Subgenus Sphex. 



a". Scutellum divided by a, longitudinal sulcus. 

 a 3 . Postscutellum bituberculate in the 

 middle. 

 a 4 . Median segment coarsely transversely 



rugose-carinate S. aurulentus Fabr. 



b 4 . Median segment not rugose-carinate. 

 a 5 . Legs and abdomen at the base and 



apex ferruginous orange S. decoratus Sm . 



b 5 . Entirely black. 



a 6 . Pubescence on thorax and median 



segment very sparse S. umbrosus Chr. 



b 6 . Pubescence on thorax and median 

 segment close, white on median 

 segment, pale golden on meso- \_narius Sm. 



notum, scutellum bare S. umbrosus Chr., var. carbu- 



b 3 . Postscutellum not bituberculate. 

 a 4 . Median segment transversely rugose- 

 carinate S. rugifer Kohl . 



b 4 . Median segment not rugose-carinate. 

 a 5 . Legs and abdomen light ferruginous. S. argentifrons Sm. 

 b b . Legs and abdomen black. 

 a 6 . Mesonotum and median segment 

 very thickly covered with pile. 

 a'. The long hairs on the clypeus 



black S. ahasuerus Kohl. 



b"i '. The long hairs on the clypeus 

 golden. 

 a 8 . Scutellum strongly convex, 

 the longitudinal sulcus 



rather indistinct S. cognatus Sm. 



b 8 . Scutellum not strongly con- 

 vex, the sulcus distinct S. vestitiis, Sm. 



b 6 . Mesonotum and median segment 

 rather sparsely pubescent. 

 a'. Postscutellum divided by a 

 longitudinal sulcus ; wings 



flavo-hyaline at the base S. modestus Sm. 



b". Postscutellum without a sul- 

 cus, wings subhyalin_' S. bttobatus Kohl. 



b". Scutellum without a sulcus. 

 a 3 . Abdomen black. 



a 4 . Clypeus notched on the middle of the 

 anterior margin. 

 a 5 . Wings hyaline, clouded at the 

 apex, the nervures at the base 



broadly dark S. luctuosus Sm. 



J 5 . Wings fuscous with a faint purple [pennis Sm. 



flush, paler at the apex <S. lucttiosus Sm., \&v.fumi- 



b 4 . Clypeus without a notch S. ermineus Kohl. 



b 3 . Abdomen steel-blue. 

 a 4 . Wings fuscous with a purple flush ... S. gratiosissimus D. T. 

 b 4 . Wings flavo-hyaline with a light fus- 

 cous border at the apex S. gilberti Turn. 



S. gilberti has sometimes a very faint line on the scutellum, 

 and in aS'. modestus Sm. the postscutellum is sometimes almost 

 bituberculate. 



Sphex (Harpactopus) globosus Sm. 



Sphex globosa Sm. Cat. Hym. B. M. iv. p. 251 (1856), 6 2 . 

 harpactopus australis Sauss. Reise ISfovara, Zool. ii. p. 42 

 (1867),$. 



