BY ROWLAND E. TURNER. 209 



Abdomen very sparsely punctured ; first segment obliquely 

 concavo-truncate anteriorly, with a faint, interrupted, transverse 

 carina before apex, apical margin raised. Second segment with 

 eight transverse carinae, including the recurved apical margin, 

 the apical carinae the strongest. Pygidium smooth at base, 

 vertically truncate posteriorly, contracted and transversely 

 striated before the truncation, surface of truncation oval, slightly 

 emarginate at apex, almost smooth. Fifth segment beneath 

 longitudinally striated. Anterior tibiae strongly notched at 

 apex and produced into three spines. Pale yellow; mandibles, 

 antennae, tarsi, pygidium and fifth abdominal segment beneath 

 fusco-ferruginous; front, sides and posterior margin of head 

 united with a triangular mark on vertex, a transverse band close 

 to anterior margin of pronotum and posterior margin narrowly, 

 anterior margin of mesonotum, truncation of median segment, 

 truncation and apical margin of first abdominal segment, second 

 segment except a spot on each side, a curved mark on each side 

 of third and fourth segments on apical margin and sides and base 

 of the segments, fifth segment except a spot on each side near 

 apical angles, base of first segment below, trochanters and femora 

 above and tibiae below black; apical margins of abdominal seg- 

 ments 2-4 beneath and a broadly triangular mark at apex 

 testaceous. Length 17 mm. 



Hab. — Adelaide River, Northern Territory. Type in Brit. 

 Mus. 



157. T. vestitus Sm. 



Thynnus vestitus Sm., Cat. Hym. B.M. vii. p 15, 1859 ($). 



(J. Clypeus truncate anteriorly, shallowly punctured, con- 

 nected by a fine carina with interantennal prominence, which 

 is divided by a delicate longitudinal carina. The whole head 

 finely punctured-rugulose, opaque, with a small shining mark 

 below anterior ocellus. Pronotum with anterior margin raised 

 and broadly emarginate, very shallowly and finely punctured- 

 rugulose. Mesonotum and scutellum punctured, scutellum 

 with a median longitudinal carina. Median segment closely 

 17 



