BY ROWLAND E. TURNER. 197 



obliquely truncate posteriorly. The horny spur at apex of 

 anterior tibiae is as long as the two basal joints of the tarsus 

 combined; and the basal joint of the anterior tarsi is strongly 

 emarginate near the base. Abdomen strongly and rather sparsely 

 punctured; first segment rugose, apical margin very slightly 

 raised, with a narrow and shallow groove before it; second seg- 

 ment with the apical margin strongly raised and a delicate 

 transverse carina near base, the intervening space transversely 

 rugose-carinate. Pygidium not contracted, vertically truncate 

 posteriorly, the face of the truncation oval and longitudinally 

 striated. Fifth ventral segment transversely striated. Entirely 

 fuscous. Length 27 mm. 



Bab. — Swan River, W.A. Type of 9 in British Museum. 



Westwood suggests that his T. gravidus may be the female of 

 this species, and Smith suggests T. molitor. The female described 

 above was placed with the males in the British Museum Collec- 

 tion, and I feel no doubt as to the correctness of the sexing. 



144. T. (Macrothynnus) poultoni, n.sp. 



(J. Very nearly allied to T. friederici D.T., from which it differs 

 in the following points: clypeus less convex and broadlyemarginate 

 at apex, and entirely black; pronotum slightly narrower and 

 also entirely black, mesonotum more deeply sculptured; disc of 

 scutellum coarsely rugose and much less concave than in T. 

 friederici; median segment obliquely truncate from postscutellum; 

 first abdominal segment broader and shorter; sculpture of epipy- 

 gium coarser and the striae much less regular, and it is much 

 more narrowly truncate at the apex, and the hypopygium is 

 much longer, though otherwise similar in shape. Structure of 

 the posterior femora similar in the two species. Length 35mm. 



llab. — Western Australia (Du Boulay); probably from the 

 Champion Bay district. Type in British Museum. 



145. T. (Macrothynnus) dilatatus Sm 

 Thynnus dilatatusSm., Cat.Hym.B.M. vii.p.43,n.l21,1859($). 

 9- Head rather small, subopaque, much broader than long. 

 Pronotum slightly emarginate anteriorly, broader than head, 



