*234 REVISION OF THE THYNNID.E OF AUSTRALIA, I., 



ill the centre. The segments finely punctured at the base, more 

 strongly and sparsely near the apex, the two apical segments 

 coarsely punctured. Entirely black; wings hyaline, nervures 

 fuscous, a slight fuscous cloud in the radial cell. Length 1 1 mm. 



Hah. —Australia. T3^pe in British Museum. 



Easily distinguished by the prominent tubercle on the clypeus. 



R. CASTANEUS Sm. 



Rhagigaster castaneus Sm., Cat. Hym. B. M. vii. p. 63, n.l5, 

 1859(9). 



Head quadrate, the front longitudinally rugulose, pubescent; 

 the occiput finely and sparsely punctured, without a sulca 

 between the antennse. Thorax short, the prothorax rather 

 broader than long, punctured sparsely. Median segment short, 

 broadened posteriorly, obliquely truncate, the surface of the 

 truncation concave. Abdomen subcylindrical, finely punctured, 

 the epipygium longitudinally rugulose, rounded at the apex. 

 Entirely castaneous-brown. Length 8 mm. 



Hah. — Australia. 



R. PUGioNATUS Sauss. 



Rhagigaster pugionatas Sauss., Reise d. Xov. Zoo!, ii. 1, Hym. 

 p.ll3,1867(,J). 



Thynnus scalca D.T., Cat. Hym. viii. U5, 1897((J). 



Saussure's description of the male is good. A Tasmanian 

 specimen in my collection is 13 mm. in length. 



9. Head rectangular, a little longer than wide, densely and 

 coarsely punctured, the punctures often confluent, the posterior 

 angles of the head rounded. Prothorax much narrower than the 

 head, narrowed and rounded anteriorly, sparsely punctured, with 

 shallow depressions on the sides near the posterior margin. 

 Mesothorax much broader anteriorl}'^ than posteriorly, sparsel}' 

 punctured with a median, longitudinal, impressed line Median 

 segment obliqueh'- truncate posteriorly, only half as \yide at the 

 base as at tlie apex, sparsely punctured, the surface of the trun- 

 cation finel}^ and closely punctured. Abdomen subcylindrical, 



