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



a 8 . Head strongly convex. puchellus Klug. 29 



b 8 . Head flattened. mackayensis 43 



b 7 . Pronotum without a sulcus. 



a 8 . Head not narrowed posteriorly, pavidus Sm. 61 



b 8 . Head narrowed posteriorly. armiger 80 



b & . Pronotum flattened. 



a 7 . Head strongly excavated on each side. 



sulcatus Sm. 46 



b 7 . Head not excavated. 

 a 8 . Head narrowed posteriorly. gilberti 82 



b 8 . Head not narrowed posteriorly. 



a 9 . Pronotum emarginate. adelaidce 



b 9 . Pronotum not emarginate. iridipennis Sm. 55 

 b 5 . The raised carina before the apex of the first 

 abdominal segment emarginate. 

 a 6 . Pronotum narrowed posteriorly. ablatus 76 



6 6 . Pronotum not narrowed posteriorly. 



a 7 . Head convex, narrowed anteriorly, sanguinolentus 79 

 b 7 . Head flattened, narrowed posteriorly. 



cerceroides Sm. 77 

 6 3 . Pronotum with a median carina or tubercle, 

 a*. Head rounded at the sides. 

 a 5 . Head broad and flat. 



a 6 . Pronotum narrowed posteriorly. crabroniformis Sm. 



var. opaciventris 65 

 b 6 . Pronotum not narrowed posteriorly, coloratus 50 



b 5 . Head narrowed into a neck posteriorly, doddii 71 



b±. Head not rounded at the sides. 



a 5 . Head broader than long. quadratics Sm. 68 



6 5 . Head longer than broad. 

 a 6 . Head strongly narrowed posteriorly, bipartitus 66 



6 6 . Head not narrowed posteriorly. 



a 7 . Head excavated on the sides. zelebori Sauss. 53 



b 7 . Head not excavated on the sides. 



a 8 . Pronotum broader than long, tasmaniensis Sauss. 51 

 b 8 . Pronotum longer than broad, conjungens 52 



ii. Fifth ventral segment striated or rugose. 



A. Pygidium not sharply contracted before the truncation or on 

 the truncation. 



a. Pygidium very narrow, the sides parallel. villosus Guer. 106 



b. Pygidium broader, usually longitudinally striated. 

 a 2 . Pygidium not notched at the sides before the apex. 



