240 REVISION OF THE THYNNID^ OF AUSTRALIA, II., 



and narrow, with a longitudinal carina between raised margins 

 reaching on to surface of truncation, which is elongate, subtrian- 

 gular, broadened to apex and truncate. 



Hob — Mackay to Cairns (Turner; $Q in cop.). 



This will probably prove to be a geographical form of T. 

 frauenfeldianus Sauss., from Sydney. 



198. T. FRAUENFELDIANUS SaUSS. 



Thynuus frauenfeldianus Sauss., Reised. Nov. Zool. ii. 1, Hym. 

 p.120, n.7, 1867. 



This is very near T. nubilipennis Sm., from which it may be 

 distinguished in the male sex by the finely rugulose head, the 

 lesser development of the yellow markings on the pronotum and 

 abdomen, and the shape of the hypopygium which is hardly at 

 all prominent at the basal angles, elongate-triangular to the apical 

 spine. 



Saussure describes the male only. The female is very similar 

 to that of T. nubilipennis, but may be distinguished by the 

 broader and much smoother head. The specimen before me does 

 not otherwise differ from T. nubilipennis, but is immature as to 

 colour. 



Hob. — Sydney. 



199. T. modestus Sm. 



Thynnus modestus Sm., Cat. Hym. B.M.vii. p. 1 9, n. 34, 1859 ($). 



(J. Clypeus broad, strongly convex, not much advanced, broadly 

 truncate at apex, subtruncate at base and connected with the 

 interantennal prominence by a narrow carina. The whole insect 

 closely and finely punctured, punctures on abdomen shallow and 

 larger. Scutellum broad and rather short; median segment 

 depressed, rounded, with a longitudinal sulcus from base to 

 centre, and one on each side from centre to apex. Abdomen 

 elongate-fusiform, first segment beneath with an oblique trian- 

 gular truncation at apex, and divided by a groove from second 

 segment, segments 2-4 above depressed at base. Hypopygium 





