82 REVISION OF THE THYNNID^ OF AUSTRALIA, II., 



ii. Labrum broad and full, scarcely narrowed at the base. 



A. The two or three apical joints of the antennae not nearly as 

 thick as the others. 



a. The hypopygium ending in a very blunt, strongly recurved 



process. 

 a 2 . The clypeus fulvous and truncate at the apex, friederici D.T. 143 

 b 2 . The clypeus black and broadly emarginate at the apex. 



poultoni 144 



b. Hypopygium broadly rounded at the apex. 



a 2 . Wings flavo-hyaline; pronotum fulvous. insignia Sm. 142 

 b 2 . Wings fuscous; pronotum black. bimillimus Sm. 141 



E. The antennae of almost equal thickness throughout. 



a. Sixth ventral segment of the abdomen with a spine at the 

 apical angles. 

 a 2 . Median segment vertically truncate posteriorly. 



a 3 . Scutellum and postscutellum produced beyond the 

 median segment. 

 a- 4 . Postscutellum very strongly emarginate at the 



apex. emarginatus Fab. 1 49 



6 4 . Postscutellum not strongly emarginate. 

 a 5 . Head and thorax entirely pale yellow, ventralis Sm. 148 

 b 5 . Thorax marked with black above or beneath. 



a 6 . Black and pale yellow dentatus Fab. 146 



b 6 . Black and bright ferruginous brown, pidchralis Sm. 147 

 b 3 . Postscutellum reaching the truncation of the median 

 segment, but not projecting beyond it. 

 a 4 . Abdomen marked with pale yellow above. 



dariviniensis 153 

 b^. Abdomen wholly black above. 



a 5 . Scutellum with a tubercle at the apex; the wings 



hyaline. brenchleyi Sm. 151 



b 5 . Scutellum without a tubercle; the wings fuscous. 



ochrocephalus Sm.152 

 b 2 . Median segment obliquely truncate or rounded pos- 

 teriorly. 

 a s . Median segment obliquely truncate, 

 a*. Hypopygium with five spines. 



a. 5 . Legs yellow. zonatu* Guer. 154 



b*. Legs ferruginous. elgncri 155 



6 4 . Hypopygium with three spines or less 



a 5 . The truncation of the median segment slightly 



concave. excaratvs 166 



b H . The truncation of the median segment not con- 

 cave. 



