96 REVISION OF THE THYNNIDiE OF AUSTRALIA, II., 



4. T. (Phymatothynnus) nitidus Sm. 



Thynnus (Agriomyia) nitidus Sm., Cat. Hym. B.M. vii. p. 30, 

 n.77, 1859(5). 



<J. Clypeus short and broad, not much produced, rather nar- 

 rowly truncate anteriorly, finely punctured, opaque, the apical 

 margin shining, a longitudinal carina reaching from the base to 

 very near the apex. Head and thorax finely punctured with 

 thin grey pubescence, fulvous on the front of the head; head a 

 little broader than the pronotum. Anterior margin of the pro- 

 notum elevated, with a deep groove behind it. Median segment 

 rounded, rather short, very finely and closely punctured. Abdo- 

 men very flat, narrow at the base, gradually widened to the 

 fourth and fifth segments, which are the broadest; shallowly 

 punctured and shining, a faint depressed transverse line near the 

 base of segments 2-4. Hypopygium very small, rounded and 

 unarmed. 



Hah— Adelaide, S.A.; Perth, W.A. 



(j>. Unknown. 



The antennae are as long as the thorax and median segment 

 combined, and of almost equal thickness throughout. The inter- 

 antennal prominence is bilobed. 



Subgenus Psammothynnus Ashm. 



Psammothynnus Ashm., Canad. Ent. xxxv. 1903. 



(J. Joints of the antennas strongly arcuate beneath, shorter and 

 stouter than in Phymatothynnus, the palpi stout, the three apical 

 joints of the maxillary palpi not slender or elongate. Abdomen 

 flattened, the segments not constricted; hypopygium short and 

 not prominent, strongly emarginate, with an appendage of long, 

 stiff hairs on each side. Second recurrent nervure received by 

 the third cubital cell near the base. 



£. Thorax strongly rugose; second abdominal segment with 

 very few transverse carinas; pygidium simple, not contracted or 

 truncate. 



Type Thynnus {Agriomyia) depressus Westw. 



