92 REVISION OF THE THYNNIDJ5 OF AUSTRALIA, II., 



b 5 . Epipygium truncate, the lobes membranous. 



a 6 . Head deeply excavated on the sides, sulcifrons Sm. 163 

 b G . Head not excavated. 



a 7 . First abdominal segment with several strong 



transverse carinas, fenestratus Sm. 167 



b 7 . First abdominal segment with one or two 

 carinas only close to the apex. 

 a 8 . Fifth ventral segment transversely rugose. 



shuckardi Guer. 172 

 b s . Fifth ventral segment longitudinally rugose. 



guerinii Westw. 173 

 b^. Epipygium without lobes at the apex. 



a 5 .. The head excavated in front on each side. 

 a 6 . The concave spaces extending to the vertex. 



leachiellus Westw.158 

 fe 6 . The concave spaces not extending to the vertex. 

 a 7 . The median segment and the first abdominal 

 segment covered with long pubescence. 



brenchleyi Sm. 151 

 b 7 . A tuft of long hairs in the middle of the first 

 abdominal segment. 

 a 8 . The truncation of the pygidium ovate. 



ventralis Sm. 148 

 b 8 . The truncation of the pygidium lanceolate 

 ovate. 

 a 9 . The second abdominal segment with nine 

 or ten rather low and slightly irregu- 

 lar earinae. dentatus Fab. 146 

 b 9 . The second abdominal segment with 

 eight or nine strong and regular 

 earinae. pulchralis Sm. 147 

 b 5 . The head not excavated. 



a 6 . The front flattened and subconcave. sabulosus 156 



b 6 . The front convex. 



a 7 . Fifth ventral segment of the abdomen longi- 

 tudinally striated. 

 a 8 . The truncation of the pygidium ovate. 

 a 9 . The anterior margin of the pronotum 

 straight. 

 a 10 . Pronotum and abdomen marked with 

 yellow. 

 a 11 . Head black; pronotum slightly 



concave. excavatus 166 



