HYMENOPTERA. 19 



33. THYNNUS HUMILIS. 



Thynnus humilis, Erichs. Wiegm. Arch. (1842) 264. 238 ? . 

 Westw. Arc. Ent. ii. 146. 



Hab. Tasmania. 



34. THYNNUS MODESTUS. B.M. 



Male. Length 8 lines. Shining black : closely and rather 

 finely punctured; the mandibles, clypeus, orbits of the eyes 

 interrupted at their summit, and a V-shaped mark between the 

 antennae, yellow. Thorax : the anterior and posterior margin of 

 the prothorax reddish-yellow ; the tibiae, tarsi, and knees pale 

 ferruginous ; wings fulvo-hyaline, the nervures fusco-ferruginous. 

 Abdomen : each segment with a large ovate honey-coloured 

 macula on each side ; beneath, the second and three following 

 segments with a smaller subangular spot on each side. 



Hab. Australia (Swan River). 



35. THYNNUS CONSTRICTUS. B.M. 



Male. Length 9^ lines. Black and shining : the mandibles, 

 clypeus, orbits of the eyes interrupted at their vertex, and a 

 V-shaped mark between the antennae, yellow. Thorax : a broad 

 fascia on the posterior margin of the pro thorax, the tegulae, a 

 square spot on the mesothorax touching the scutellum, the latter 

 with a spot behind, the post- scutellum, and two oblique lines on 

 the metathorax, yellow ; wings fulvo-hyaline, the nervures fusco- 

 ferruginous ; the femora ferruginous, the tibiae and tarsi yellow ; 

 the femora fuscous in front. Abdomen: the margins of the 

 segments constricted; an oblong yellow macula at the lateral 

 margins of each segment, each macula notched in front ; at the 

 apical margin of each segment are a number of large punctures ; 

 beneath coarsely punctured, and with a minute yellow spot on 

 each side of the second, third, and fourth segments. 



Hab. Western Australia (Swan River). 



36. THYNNUS SENEX. B.M. 



Male. Length 9 lines. Black : the head, thorax, and legs 

 thickly covered with cinereous pubescence, slightly fulvous on 

 the vertex and disk of the thorax ; the mandibles, clypeus, and 

 lower orbits of the eyes yellow ; the clypeus with a transverse 

 line above and two oblique lines beneath, ferruginous. Thorax : 

 the hinder margin of the prothorax obscurely ferruginous ; the 

 wings hyaline, the nervures and tegulae ferruginous ; the legs 

 ferruginous, with the coxae and trochanters black. Abdomen : 



