228 REVISION OF THE THYNNID.E OP AUSTRALIA, II., 



transverse line near base of segments 2-5, apical margin of the same 

 segments slightly depressed; apical segment rugose. Hypopygium 

 triangularly prominent near basal angles, thence gradually 

 narrowed to base of the small apical spine. A groove between 

 first and second segments beneath. 



Q. Head smootli with a few scattered punctures, slightly 

 broadened anteriorly; mandibles rather blunt, eyes situated near 

 their base, on sides of head. Thorax and median segment 

 sparsely punctured, pronotum half as broad again as long; median 

 segment obliquely truncate posteriorly. Abdomen sparsely punc- 

 tured, first segment concavo-truncate anteriorly, with a median 

 sulcus on the truncation, the apical margin broadly depressed, a, 

 raised curved mark before apex deeply emarginate in middle. 

 Second segment with three transverse carinas near base, the apical 

 portion showing traces of fine transverse striae. The remaining 

 segments deeply and rather sparsely punctured, depressed on 

 apical margin. Pygidium lanceolate, oblique and very slightly 

 widened at apex. Fifth segment beneath longitudinally striate. 



Hab.-— Swan River, W. A. (Smith; $Q in cop.). 



183. T ihritans Sm. 



Thynnus irritans Sm., Trans. Ent. Soc. London, 1868,p.235( ( J). 



(J. Clypeus strongly punctured, broadly truncate at apex, very 

 narrowly at base, and connected with interantennal prominence 

 by a broad carina. Head punctured-rugulose, rather small, hardly 

 as broad as pronotum; a sulcus from just below anterior ocellus 

 to between the antennas. Thorax closely punctured, anterior 

 margin of pronotum straight; scutellum broadly truncate at apex. 

 Median segment short, oblique from postscntellum, then vertically 

 concavo-truncate to apex, delicately punctured-rugulose. Abdo- 

 men elongate, closely punctured, first segment oblique, not trun- 

 cate at apex beneath; a slightly impressed curved line near base 

 of segments 2-4. Hypopygium triangular, short, slightly pro- 

 minent at ba^al angles and with a short apical spine. 



£, Head much narrowed posteriorly, narrower than pronotum, 

 flattened on front, antennas near together at the base, with a 



