BY ROWLAND E. TURNER. 251 



Thynnus erraticus Sm. 



Thynnus erraticus Sm., Journ. Proc. Linn. Soc. Zool. iv. Suppl. 

 p.114, 1860(<J). 



Hob. — Batchian. 



Thynnus pullatus Sm. 



Thynnus pullatus Sm., Journ. Linn. Soc. Zool. vii.p.26,1863( ( J). 



Ilab. — Bouru. 



Thynnus placidus Sm. 



Thynnus placidus Sm., Journ. Linn. Soc. Zool.vii.p.26,1863((J). 



Hub. — Waigiou. The species has the median segment exposed. 



Thynnus serriger Sharp. 



Thynnus serriger Sharp, Willey, Zool. Results iv. p.388, P.xxxv. 

 fig.l3,1900($). 



Hab. — New Britain. 



Thynnus olivaceus, n.sp. 



(J. Clypeus large, pointed and tumid at base, broadly truncate 

 at apex, punctured, thinly clothed with short pubescence. Head 

 broad, finely punctured, pubescent; front between the antennae 

 prominent, rounded anteriorly, joined to base of clypeus by a 

 short carina; a faint longitudinal carina on vertex reaching from 

 between posterior ocelli to posterior margin of the head. 

 Thorax finely and shallowly punctured, pronotum nearly as 

 broad as head, anterior margin slightly raised, with a deep 

 transverse groove behind it. Scutellum broadly triangular, pro- 

 duced at apex into a small tubercle. Postscutellum covering base 

 of median segment, which is obliquely truncate, the surface of 

 the truncation almost smooth, with a little short pubescence, 

 longer on sides of segment. Abdomen shining, sparsely 

 punctured, first segment vertically truncate anteriorly, as broad 

 as second, which is broader than the following segments ; sixth 

 segment with a spine on each side beneath at apical angles. 

 Hypopygium carinate beneath, broad at base with a strong spine 

 on each side, thence produced shape to apex, a spine on each 



