154 REVISION OF THE THYNNIDiE OF AUSTRALIA, II., 



short, fusiform; segments 2-4 with an impressed transverse line 

 near the base. Hypopygium rather short, terminating in an 

 apical spine with a very short spine on each side of its base. 

 Black; with sparse grey pubescence; antennae, anterior tibia? 

 and -tarsi and abdomen except the two basal segments ferru- 

 ginous; pronotum anteriorly broadly interrupted in middle and 

 a spot on posterior margin of mesonotum yellow. Wings hyaline, 

 nervures black. The antennse are very short, of about the same 

 length as the mesonotum. Length 8 mm. 



9- Head smooth and shining, broader than long anteriorly, 

 much narrowed posteriorly, slightly convex. Thorax and median 

 segment almost smooth; pronotum flat, narrower than head, 

 broader than long, narrowed posteriorly, the anterior margin 

 straight; mesonotum not very small, rounded posteriorly; median 

 segment oblique from mesonotum, more sharply depressed 

 towards apex. Abdomen broader than thorax, sparsely punc- 

 tured; first segment with the apical margin depressed; second 

 with five transverse carina?, including the raised apical margin. 

 Pygidium small, ovate-lanceolate, with a median longitudinal 

 carina, the margins elevated and slightly diverging towards apex 

 which is rounded. Black; antennas, legs and carina) on second 

 abdominal segment fuscous. Length 5 mm. 



Ilab. — Port Darwin (G. Turner; $Q in cop.). 



83. T. (Aeolothynnus) aterrimus Sm. 



Thynnus aterrimus Sm., Descr.n.sp. Hym. p.l64,n.l6,1879( c J). 



(J. Clypeus subtriangular, narrowly truncate at apex. Head 

 rugose on front, punctured-rugulose on vertex. Thorax and 

 median segment closely and finely punctured; pronotum short, 

 broadly emarginate anteriorly; a depressed, transverse row of 

 large punctures at base of scutellum. Median segment short and 

 broad, rounded at sides. Abdomen broadly fusiform, sparsely 

 punctured; segments 2-5 strongly depressed at base above and 

 beneath. First ventral segment with a very prominent longi- 

 tudinal carina, deeply separated from second segment. Hypo- 



