BY R. E. TURNKR. 667 



impressed median line. Closely and rather coarsely punctured; 

 scutellum, postscutellum and ventral segments 2-4 almost smooth; 

 enclosed area at the base of the median segment smooth, with 

 short striae at the base and divided by the usual longitudinal 

 groove. 



(J.Clypeus convex, longer than broad, without a free lamina, 

 truncate at the apex. Antennse inserted only about one-half as 

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

 clypeus; pygidial area narrowed towards the apex. 



fia6. —Adelaide, S. A. 



Cerceris fluvialis Sm. 

 Cerceris fluvialis Sm., Ann. Mag. Nat. Hist.(4), xii, p.412, 1873,9. 



^.Aurantiaca, macula circum ocellos ad oculos attingente, meso- 

 noto, pleuris, sterno, segmento mediano dimidio apicali, seg- 

 mentoque abdominali quarto nigris; alls flavo-hyalinis, apice 

 obscuris; clypeo ante apicem subtuberculato; mesopleuris minute 

 tuberculatis; segmento mediano area basali delicatissime trans- 

 verse striata. Long 1 2 mm. 



^•Clypeus convex and subtuberculate below the middle, then 

 triangularly and subconcavely depressed to the apex, much 

 broader tlian long. Antennae inserted very low down, more than 

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

 clypeus, second joint of the Hagellum very little longer than the 

 third. Mesopleurae with a very small tubercle; pronotum rounded 

 at the angles; first abdominal segment twice as broad as long; 

 fifth ventral segment widely and shallowly emarginate at the apex, 

 the ventral segments without a depressed median line; pygidial 

 area broadest at the base, about one-half as broad again at the base 

 as at the apex, twice as long as the greatest breadth. Closely 

 and not very deeply punctured; pronotum, mesonotum, scutellum 

 and postscutellum shining and almost smooth; enclosed area at 

 the base of the median segment finely transversely striated; 

 ventral segments of the abdomen very finely punctured, the three 

 basal segments almost smooth. y*(\r^\ C ,^ /^N. 



Hab. — Swan River, W.A.(Du Boulay). /Cs^'^6^^ ''^^c,-^" 



LIBRARY :2o\ 



