196 REVISION OF THE THYNNID^E OF AUSTRALIA, II., 



of truncation, surface of truncation elongate-ovate, with strong 

 longitudinal striae on basal half. Fifth ventral segment longi- 

 tudinally striated. Ferruginous-brown, mesonotum, median seg- 

 ment, second dorsal abdominal segment, base of third and 

 pygidium black. Length 21mm. 



Hab. — Swan River, W. A.(Smith). Allied to T. simillimus Srm 



143. T. (Macrothynnus) friederici D.T. 



Thynnus klugii Westw., Arc.Ent.ii.2,p.l40,P.82,fig.l,1844( ( J).. 



Thynnus friederici D.T., Cat. Hym. viii. 107, 1897(<J). 



(J. Clypeus strongly convex, depressed and very broadly 

 truncate at apex, rugulose; interantennal carina broadly rounded 

 at apex, a delicate carina from anterior ocellus nearly reaching 

 base of clypeus. Head and thorax finely rugulose, the pubes- 

 cence close and short, fulvous above and grey beneath; scutellum 

 excavated on disc, with a subtubercular elevation on each side of 

 the concave space. Median segment oblique, punctured-rugulose, 

 with long grey pubescence. Abdomen almost smooth; first seg- 

 ment not quite as broad at apex as the second. Epip} T gium long,, 

 deflexed, broadly truncate at apex, coarsely striated, striae curved 

 at apex. Hypopygium broad at base, sharply narrowed and 

 produced into a blunt, strongly recurved process. Length 38 mm. 



The mandibles are very strongly bidentate, with a very long 

 beard on the outer margin, the sides of the head with a fringe 

 of long hairs; the antennae slender at the apex; the anterior coxae 

 concave at their base; the spur on the anterior tibiae strongly 

 developed; hind femora swollen in the middle and subtuberculate. 



$. Mandibles long, bearded on outer margin, strong but not 

 blunt at apex. Clypeus broadly but slightly emarginate at apex, 

 with a carina from base to centre. Head sparsely punctured on 

 vertex, more finely and closely on front, with a deep longitudinal 

 frontal sulcus, which is very broad between the antennae, where 

 the front on each side of it is produced into an acute tubercle. 

 Eyes oval, situated very near base of mandibles. Pronotum 

 punctured-rugose, subrectangular, slightly narrowed posteriorly, 

 anterior angles acute, broader than long. Median segment 



