214 REVISION OF THE THYNNlDiE OF AUSTRALIA, II., 



spine at base on each side, thence narrowly produced to the 

 apical spine, which is slightly recurved. 

 Rah.— Sydney(Smith). 



162. T. confusus Sm. 



Thynnus confusus Sm., Cat. Hym. B.M. vii. p. 13, n.5, 1859((J). 



(J. The whole insect closely punctured; median segment almost 

 vertically truncate from postscutellum. First abdominal segment 

 almost vertically truncate anteriorly; beneath with a small 

 oblique, triangular truncation at apex and a groove between first 

 and second segments. There is no spine at the apical angles of 

 the sixth ventral segment. Dorsal plate of apical segment punc- 

 tured, broadly rounded at apex. Hypopygium only slightly 

 prominent near basal angles, thence sharply narrowed and very 

 narrowly produced to apical spine. 



Hob. — Australia(Smith). 



A specimen in the British Museum Collection, which appears 

 to be an immature or discoloured example of this species, is from 

 the Swan River. 



1 do not regard this species as in any way allied to T. variabilis 

 Kirby, as suggested by Smith. 



163. T. sulcifrons Sm. 



Thynnus sulcifrons Sm., Cat. Hym. B.M. vii. p.43,n.l 19,1859(9). 



£. A broad central elevated ridge on head reaching from vertex 

 to clypeus, with a deep excavation on each side reaching nearly 

 to posterior margin, head widened and rounded behind eyes, 

 shining, with a few minute punctures. Pronotum nearly twice 

 as broad as long, sparsely punctured, a row of large punctures 

 along anterior margin, each with a long hair springing from it. 

 Median segment almost smooth. Abdomen smooth with a few 

 scattered punctures; first segment vertically truncate anteriorly, 

 with a transverse carina before apex and apical margin recurved; 

 second segment with about ten transverse carinse, including the 

 recurved apical margin. Pygidium compressed, truncated pos- 



