120 REVISION OF THE THYNNIDjE OF AUSTRALIA, II., 



and obscure longitudinal sulcus from anterior margin, anterior 

 angles slightly prominent. Mesonotum longer than broad; 

 median segment rather slender, obliquely truncate posteriorly 

 the angles at the base of the truncation rounded. Abdomen 

 shining and sparsely punctured; second segment with four trans- 

 verse carina?, including the raised apical margin; first, third, 

 fourth and fifth segments with a raised, strongly rounded mark 

 on each side before apical margin. Fifth ventral segment punc- 

 tured. Pygidium lanceolate, slightly widened at apex. Entirely 

 lightly ferruginous-brown. Length 6 mm. 



Hab. — Adelaide, S.A. 



Types in Brit. Mus. 



38. T. (Aeolothynnus) penetratus Sm. 



Thynnus penetrahisSm., Descr. n.sp. Hym. p. 158, n. 1,187 9 ((J). 



£. Clypeus very narrowly truncate at apex, with a delicate 

 carina from base to beyond centre. Head and thorax very finely 

 and closely punctured; scutellum narrowly rounded at apex. 

 Median segment very delicately punctured-rugulose, smooth and 

 shining at base. Abdomen elongate-fusiform, shining and very 

 minutely punctured, flattened. Hypopygium broadly rounded 

 at apex, with a minute spine. 



#a&.— Swan River, W.A. (Smith). 



Allied to T. toestwoodi Guer., but the hypopygium is very 

 different, and the scutellum is rounded at the apex, not truncate. 



39. T. (Aeolothynnus) Beatrix, n.sp. 



(J. Clypeus very narrowly truncate at apex, with a delicate 

 carina from base not reaching apex, finely and closely punctured. 

 Head and thorax very closely punctured; interantennal promi- 

 nence only represented by a short carina above base of each 

 antenna; scutellum rather long, subtriangular, truncate at apex. 

 Median segment rounded, very delicately transversely striated. 

 Abdomen shining and shallowly punctured, fusiform and flattened; 

 second segment depressed at base; epipygium rugose. Hypopy- 

 gium subtriangular, rounded at apex, with a very short spine. 



