THTNNTJ8. 169 



and the mandibles yellow, the latter black at their apex. The 

 margins of the prothorax yellow, the hinder one broadly so, the 

 anterior one interrupted in the middle ; the tegnlte, an ovate spot 

 on the scuteUum, and the postscutellum yellow ; wings subhyaline, 

 iridescent, and with black nervures ; the coxae and trochanters 

 black. Abdomen impunctate, and with a large ovate macula on the 

 second, third, and fourth seements laterally. 



Hah. Champion Bay. 



30. Thynnus deceptor. 



Male. Length 7^ lines. — Head, thorax, and base of the abdomen 

 black, the rest of the abdomen and the legs more or less feri-u- 

 ginous. Head closely punctured ; the mandibles, except the ex- 

 treme base, ferruginous. Thorax with the disk and the scutellum 

 strongly punctured, otherwise less coarsely and more closely punc- 

 tured ; beneath, and also the metathorax, with short white pubes- 

 cence ; wings fulvo-hyaline, the nervures ferruginous ; the coxte 

 black ; the femora and tibioe with more or less of dark stains. 

 Abdomen with the segments slightly constricted, their apical 

 margins with a narrow fringe of white pubescence. 



Female. Length 5 lines. — Black ; the head very smooth and shin- 

 ing, and with an obscure ferruginous tint. Thorax smooth above ; 

 legs obscurely rufo-i)iceous ; the intermediate tibiae much swollen. 

 Abdomen with the basal segment longitudinally striated, its apical 

 margin smooth and shining ; the second segment with deep trans- 

 verse grooves above, the rest of the segments smooth and with 

 scattered punctures. 



Hah. Champion Bay. 



31. Thynnus indistinctus. 



Male. Length 7i lines. — Black ; the segments of the abdomen with 

 indistinct reddish fasciae. Head finely rugose ; the cheeks and face 

 at the sides with white pubescence ; the clypeus convex, produced 

 over the labrum, and, as well as the mandibles, yellow. The thorax 

 with white pubescence, which is sparing on the disk and dense 

 and longest on the metathorax ; the legs have a similar pubescence, 

 which is longest on the femora beneath ; the apical joints of the 

 tarsi obscurely rufo-piceous ; wings fusco-hyaline, the nervures 

 black. Abdomen truncate at the base, covered with fine shallow 

 punctures ; the basal and four following segments with indistinct 

 fasciae of a reddish yeUow, the fasciae most distinct laterally ; the 

 apical segment terminates in a lanceolate process, very acute at 

 the apex, and with two small teeth at its base. 



Hah. Western Australia. 



