90 REVISION OF THE THYNNIDJ5 OF AUSTRALIA, II., 



ft 3 . Clypeus not pointed. 

 ft 4 . Head black. 



a 5 . Front of the head yellow; the thorax ferruginous. 



flavifrons Sm. 120 

 ft 5 . Head and thorax entirely black. protervus Sm. 119 



ft 4 . Head ferruginous. 



a 5 . Pronotum black. connectens Sm. 132 



ft 5 . Pronotum ferruginous. flavipennis Sm. 134 



ft 3 . Clypeus pointed. 



a, 4 . Fifth ventral segment rugose. 



a 5 . The spines on the sides of the pygidium very 



small. rujlventris Guer. 127 



ft 5 . The spines on the sides of the pygidium well 



developed. criuitus. 126 



ft 4 . Fifth ventral segment of the abdomen striated. 

 a 5 . Head rather small, strongly rounded at the 



posterior angles. kirbyi 124 



ft 5 . Head large, less strongly rounded posteriorly. 

 « 6 . Abdomen almost entirely yellow, with a few 

 black marks. 

 a 7 . Median segment black. wallisii Sm. 128 



ft 7 . Median segment yellow or ferruginous. 



annulatus Kirby 139 

 ft 6 . Abdomen black or fusco-ferruginous, marked 



with yellow. apterus Oliv. 136 



B. Pygidium contracted either at the base of the truncation or 

 near the middle of the truncation, 

 ft. Pygidium narrow, constricted on the truncation before the 

 apex. 

 a 2 . Front depressed and slightly concave on each side. 



ultimus 206 



ft 2 . Front without depressions. 



a 3 . Second abdominal segment with five transverse carinse; 

 head broader than long. 

 a. 4 . Legs black. waterhousei 205 



ft 4 . Legs ferruginous. 



a 5 . Head black. /urwipennts Westw.208 



ft 5 . Head ferruginous. fulvipes Gue'r. 207 



b :i . Second abdominal segment with six carinae; head as 

 long as broad. 

 « 4 . Abdomen sparsely and rather deeply punctured. 



gracilis Westw. 211 

 ft 4 . Abdomen sparsely and finely punctured, pugionatus Gu6r.210 



