86 REVISION OF THE THYNNIDjE OF AUSTRALIA, II., 



a 9 . Clypeus yellow, the abdomen broadly 

 fusiform. 

 a 10 . Abdomen black. binghami. 204 



b 10 . Abdominal segments margined with 



dull ferruginous-brown, ultimus. 206 



b 9 . Clypeus margined with white at the 

 sides; abdomen elongate-fusiform. 

 a- . Mesopleurae red. pitgionatus Guer. 210 



b 10 . Mesopleurae black. gracilis Westw. 211 



b 3 . Clypeus emarginate at the apex. 



o. 4 . Legs ferruginous; wings flavohyaline. 



a 5 . Abdomen sparsely punctured. fulvipes Guer. 207 



b 5 . Abdomen closely punctured. fumipemiis Westw. 208 



b 4 . Legs black; wings hyaline. senilis Erichs. 209 



$ $ . i. Fifth ventral segment punctured. 

 A. Tarsal ungues bifid. 



a. Second dorsal segment of the abdomen with less than four 



transverse carinas. 

 a 2 . Thorax punctured; the second dorsal segment of the 

 abdomen rugose with a transverse carina at the base 

 and at the apex. 

 a s . Head strongly rounded at the posterior angles. aratus. 2 



A 3 . Head almost rectangular. monilicornis Sm. 1 



b 2 . Thorax coarsely rugose. 



a 3 . Pronotum without a carina. depressus Westw. 5 



b 3 . Pronotum with a median carina. fulvopilosus Sm. 6 



b. Second dorsal segment of the abdomen with four or more 



transverse carinse. 

 a' 2 . Pronotum without a carina. 

 a 3 . Pygidium not contracted. 



a*. Head about as long as broad. cryptoides Sm. 1 1 



b 4 . Head broader than long. 



a 5 . Head rounded at the sides. trivialis Sm. 9 



b 5 . Head not rounded at the sides. nitidulus. 10 



b 3 . Pygidium contracted, 

 a*. Second dorsal segment of the abdomen with six 



transverse carinse. proximus. 8 



b*. Second dorsal segment of the abdomen with less 

 than six transverse carinae. 

 a 5 . Head large and convex. attenuatus Sm. 103 



b". Head flattened. 



a r '. Pronotum with a median sulcus on the anterior 

 portion. 



