BY ROWLAND E. TURNER. 289 



scutellum. The sliape of the head in tlie female is different, and 

 the median segment is more abruptly truncate. 



T. FLAVOPiCTA Uitsema. 



Aehcrus Jiavopictus Ritsema, Ent. Mag. xii. p. 185, 1876((J). 



Thynnus saemiiMer'i D.T., Cat. Hym. viii. 115, 1897. 



(J. Clypeus narrowly advanced, very finely punctured, smooth 

 at the apex, with a carina from the base almost reaching the 

 apex, thinly clothed with grey pubescence. Head punctured, 

 the sides with a beard of cinereous pubescence, the cheeks 

 bluntly produced at the base of the mandibles, a delicate longi- 

 tudinal carina from the vertex, almost reaching the anterior 

 ocellus. Prothorax short and broad, not produced at the angles, 

 very sparsely punctured. Mesothorax and scutellum punctured, 

 the scutellum short, truncate at the apex; median segment 

 opaque, pubescent, punctured-rugose. Abdomen smooth and 

 shining, the petiole long and slender, the second segment 

 depressed at the base. Hypopygium with a spine on each side 

 near the base, thence gradually narrowed, the apical spine very 

 short. Black; the anterior margin of the clypeus, two small 

 spots between the antennae, the anterior margin of the piothorax, 

 narrowly interrupted in the middle, the teguke and the post- 

 scutellum yellowish-white. Wings hyaline, faintly iridescent, 

 nervures black. Length 11mm. 



9, Head, thorax, and median segment strongly and rather 

 sparsely punctured; head subquadrate, slightly convex, rounded 

 at the posterior angles; prothorax subquadrate, rather broader 

 than long; mesothorax narrowed posteriorly; median segment 

 short, much broader at the apex than the base, obliquely truncate 

 posteriorly, the surface of the truncation very densel}' and finely 

 punctured. The thorax narrower than the head or abdomen. 

 Abdomen with the first segment vertically truncate at the base, 

 the three basal segments strongly and rather sparsely punctured, 

 the apical margins slightly depressed; fourth and fifth segments 

 densely covered with fine, shallow punctures. Pygidium con- 

 tracted at the base, narrow, widened to the apex, where it is 



