242 REVISION OF THE THYNNIDjE OP AUSTRALIA, II., 



near basal angles, thence produced in an elongate-triangular form 

 to base of the strong apical spine. 



Hab.— Swan River (Smith). Nearest to T. modestus Sin. 



201. T. unifasciatus Sm. 



Thynnus unifasciatus Sm., Brenchley's Cruise of the Curacoa, 

 458, P.xliii. f.l, 1873. 



<J. Clypeus strongly convex, more narrowly truncate at apex 

 than in most of the species of Thynnus, coarsely punctured. 

 Lateral anterior angles of pro thorax slightly prominent; anterior 

 margin of pronotum, which is as broad as the head, rather 

 strongly raised at sides. Mesonotum and scutellum shallowly 

 but not very sparsely punctured, scutellum strongly hollowed in 

 middle and towards apex. Median segment oblique, short and 

 transversely striate. The hypopygium has a strong tooth on 

 each side near base, thence narrowed abruptly and produced with 

 parallel sides, subconical at extreme apex, with a faintly recurved 

 apical spine. First abdominal segment longitudinally carinate 

 beneath, the carina produced at apex into a long tubercle over- 

 arching the rather deep groove which separates the first and 

 second segments. Wings hyaline, anterior wings fuscous on 

 basal half and along costa. Length 18-23 mm. 



Hab.— Mackay, Q.(Turner). 



The original description is very poor, but is accompanied by a 

 good figure. The species is very distinct, but is most nearly 

 allied to T. impetuosus Sm. 



202. T. impetuosus Sm. 



Thynnus impetuosus Sm., Trans. Ent. Soc. Lond.l868,p.233((J). 



(J. Clypeus produced and truncate at apex, apical margin 

 depressed and membranous, the raised portion above the depres- 

 sion strongly emarginate, coarsely punctured-rugose. Head 

 broad, sparsely punctured, anterior ocellus situated in a depres- 

 sion, from which a delicate carina reaches to base of clypeus. 

 Anterior margin of pronotum raised, the lateral angles slightly 



