98 REVISION OF THE THYNNID^E OF AUSTRALIA, II., 



Subgenus Zeleboria Sauss. 



<J. The males may be distinguished by the three terminal 

 joints of the maxillary palpi being long and slender as in Tachy- 

 nomyia, from which they may easily be distinguished by the 

 form of the head which is not deeply hollowed beneath or bearded 

 on the sides. The first joint of the maxillary palpi is very short; 

 the first joint of the labial palpi is long; and the labrum is small, 

 truncate at the apex, and very sharply narrowed posteriorly. 

 The abdomen is flattened and subpetiolate. 



£. The females show no good distinguishing characters. The 

 fifth ventral segment is punctured, and the pygidium usually not 

 contracted or truncate, but in one species it is elongate and con- 

 tracted. In the typical group the tarsal ungues are bidentate. 

 The carinas on the second abdominal segment vary in number, 

 but do not exceed six in any of the species. 



Type Thynnus (Agriomyia cmaculatus Sm. 



Ashmead gives T. carinatus 8m., as the type of the genus, but as 

 T. sexmaculatus is given first by Saussure, I retain it as the type, 

 and place T. carinatus in another subgenus. When the sexes are 

 better known the group may require further division. 



7. T. (Zeleboria) sexmaculatus Sm. 



Thynnus {Agriomyia) sexmaculatus Sm., Cat. Hym. B.M. vii. 

 p.32, n.81, 1859(<J). 



Zeleboria sexmaculata (Sm.) Sauss., Reise d. Nov. Zool. ii. 1, 

 Hym. p.131, 1867. 



<J. Clypeus short, rather broadly truncate at the apex. Pro- 

 notum not shortened, the anterior margin only very slightly 

 raised at the sides. Median segment slender. The hypopygium 

 is very similar to that of T. trivialis, but rather longer and 

 narrower, and rounded at the apex; the sides are nearly parallel 

 and it is twice as long as broad. I have seen only the type. 



Q. Unknown. 



In this and in the allied species T. trivialis and 2\ proximus the 

 second cubital cell is much shorter than the third; and the three 



