Mr. R. E. Turner on Fossorial Hyynenoptera. 121 



less distinctly truncate ; the second transverse cubital nervure 

 much less oblique, which makes the second abscissa of the 

 radius much longer than the third, not shorter as' in Jlni- 

 hriatus, and the second recurrent nervure is received close to 

 the base of tlie third cubital cell, distinctly closer than in 

 fimhriatus. The extent of difference in these details of 

 neuration varies individually to a certain degree. The type 

 o^ fimhriatxis from Adelaide is identical with specimens from 

 Yallingup, W.A. 



A form from Brisbane (HacJcer), taken in March, is pro- 

 bably a subspecies, the male differing in having the triangular 

 space on the clypeus narrower ; the female in the form 

 of the sixth dorsal segment, which has the sides almost 

 parallel. 



Dimorphothynnus triinciscutis, sp. n. 



c? . Niger, nitidus, albo-pilosus ; alls fusco-caeruleis. 

 Long. 16 mm. 



c? . Clypeus finely punctured, thickly clothed with white 

 pubescence ; a narrow triangular area extending from the 

 base to the apex, pointed at the base, with distinct lateral 

 cariniB, the narrow space enclosed by the carina irregularly 

 rugose-striate. Antennae scarcely longer than the thorax, of 

 even thickness throughout ; the interantennal prominence 

 broad, very broadly rounded at the apex and irregularly 

 longitudinally striated, separated from the front by a trans- 

 verse carina which does not reach the eyes, from this carina 

 an arched carina extends over the anterior ocellus enclosing 

 an almost semicircular space. Vertex shining, finely and 

 rather sparsely punctured. Pronotum scarcely half as long 

 as the mesonotum, finely transversely striate-rugulose, the 

 anterior margin raised and almost straight, the anterior 

 angles of the prothorax acutely produced beneath. Meso- 

 notum and scutellum shining, sparsely punctured, the dorsal 

 surface of the scutellum flat, transverse at the apex and 

 almost vertically truncate posteriori}^ ; mesopleurte coarsely 

 punctured. Median segment shorter than the scutellum, 

 closely punctured at the sides, sparsely in the middle, almost 

 vertically truncate posteriorly, the dorsal surface separated 

 from the posterior slope by a strong carina. Abdomen 

 closely but not coarsely punctured, the segments slightly 

 constricted at the base ; first ventral segment witii a strongly 

 raised longitudinal carina which is broken before the apex so 

 as to form an apical and a pre-apical tubercle. Seventh 

 dorsal segment very broadly truncate at the apex, the base 



