Mr. II. E. Turner on Fossor'ial Ili/nimoptera. 121 



less distinctly truncate; the second transverse cubital ncrvuro 

 much less oblique, wiiicli makes the second abscissa of the 

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

 briatu.^, and the second recurrent nervure is received close to 

 the base of the tliirtl cubital cell, distinctly closer than in 

 Jiml>rialug. Tho extent of difference in these details of 

 neuration varies individually to a certain degree. The type 

 ol\fiml>vuitus from Adelaide is identical with s[)eeiinens from 

 Yallingup, W.A. 



A form from Brisbane {flaclci'r)^ taken in March, is pro- 

 bably a subspecies, the male dilfeiiiig in having the triangular 

 space on the clypeus narrower ; the female in the form 

 of the sixth 'dorsal segment, which has the sides almost 

 paralkl. 



Dimorphothynnus trunciscutisj sp. n. 



S . Niger, nitidus, albo-pilosus ; alis fusco-cseruleis. 

 Long. 10 mm. 



cJ . Clypeus tinely punctured, tiiickly clothed with white 

 pubescence ; a narrow triangular area extending from the 

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

 carinjB, the narrow space enclosed by the carina irregularly 

 rugose-striate. Antennse 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 tliis 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 lon^- 

 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 posteriorly ; mesopleurse coarsely 

 punctured. Median segment shorter than the scutellum, 

 closely punctured at the sides, spar:,oly in the middle, almost 

 veitically 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 with a strongly 

 raised longitudinal carina which is broken before the apex so 

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

 dorsal segment very broadly truncate at the apex, the base 



