78 REVISION OF THE THYNNID.E OF AUSTRALIA, II., 



a 7 . Mesonotum and median segment marked with 



yellow. rubromaculatus. 35 



b 7 . Mesonotum and median segment black. 

 a 8 . Abdomen not marked with yellow, the four 



basal segments ferruginous, innocuus. 36 



ft 8 . Abdomen with yellow spots on the sides, 

 the second segment only marked with 

 ferruginous. planiventris. 40 



b s . Hypopygium with an apical spine. 



a 6 . Hypopygium rounded or triangular. Abdomen 

 black and yellow. 

 a 7 . Hypopygium triangular. beatrix. 39 



b 7 . Hypopygium rounded. penetratus Sm. 38 



b e . Hypopygium truncate at the apex. 

 a 7 . Abdomen black, usually marked with yellow 

 or white. 

 a 8 . Thorax wholly black, the legs ferruginous. 



generosus. 37 



b 8 . Thorax marked with yellow, the legs black. 



a 9 . Wings wholly hyaline. westwoodi Guer. 28 



6 9 . Wings hyaline with a fuscous cloud in 



the radial cell. machayensis. 43 



b 7 . Abdomen more or less ferruginous. 



a 8 . Abdomen ferruginous except at the extreme 

 base. 

 a 9 . Front without a longitudinal sulcus. 



decoratus Sm. 41 

 ft 9 . Front with a well marked longitudinal 



sulcus. sodalis. 42 



b 8 . The apical segments of the abdomen black. 

 a 9 . Abdomen without yellow lunules. 



tenuis. 33 



b 9 . Abdomen marked with yellow lunules or 

 spots. 

 a 10 . Abdomen marked with lunules. 

 a 11 . Without a median frontal sulcus. 



pulchelhis Klug. 29 

 bi l . With a median frontal sulcus. 



pulcherrimus. 30 

 & 10 . Abdomen with yellow spots on the 



sides. minutus Sm. 32 



b 4 . Abdomen not much flattened, the segments more or 

 less constricted. 



