34 HYMENOPTERA. 



86. THYNNUS (AGRIOMYIA) TRYPHONOIDES. B.M. 

 Male. Length 4 lines.- Head and thorax black; abdomen 



and legs ferruginous. The clypeus much produced, its apex as 

 well as the mandibles yellow, the latter ferruginous at their tips ; 

 antennae shorter than the thorax, the joints subarcuate. The 

 prothorax above, the tegulae, and post-scutellum yellow ; the 

 wings subhyaline and iridescent, the nervures fuscous, becoming 

 pale ferruginous towards their base ; the coxae, trochanters, and 

 base of the femora black. Abdomen widened towards its apex, 

 its extreme base and two transverse spots beneath, black ; the 

 extreme base of the fourth and fifth segments above, fuscous; 

 the head and thorax with a thin pale fulvous pubescence. 



Hob. Australia (Adelaide). 



87. THYNNUS (AGRIOMYIA) CERCEROIDES. B.M. 

 Male. Length 4^ lines. Black, much variegated with yellow : 



the head and thorax strongly punctured; the clypeus, man- 

 dibles, a spot above the insertion of each antenna, a line on the 

 inner and outer orbits of the eyes, yellow. Thorax : a line on 

 the anterior and posterior margins of the prothorax (the former 

 interrupted), a large irregular-shaped spot beneath the wings, 

 with a smaller one behind it, a large curved macula at the sides 

 of the metathorax, a lunate spot on the scutellum and the post- 

 scutellum, yellow ; the legs yellow, with black and ferruginous 

 stains ; the wings hyaline, the nervures testaceous. Abdomen : 

 the segments deeply constricted, the five basal segments with 

 oblong maculae on each side, the maculae emarginate in front; 

 beneath, the second, third, fourth, and fifth segments with an 

 oblong macula at their lateral margins, and the apical segment 

 with a short stout tooth on each side. 



Hob. Australia. 



88. THYNNUS (AGRIOMYIA) TRISTIS. B.M. 

 Male. Length 5 lines. Black : clothed with cinereous pu- 

 bescence, rather densely so on the face and sides of the thorax ; 

 that on the abdomen thin and downy; the head and thorax 

 closely punctured, the base of the metathorax shining and deli- 

 cately striated ; wings hyaline and iridescent, the nervures black ; 

 the tibiae with pale testaceous spines at their apex. 



Hab. Australia. 



89. THYNNUS (AGRIOMYIA) RUFICORNIS. B.M. 

 Male. Length 5 lines. Black : the head and thorax closely 



punctured, the base of the metathorax shining and impunctate ; 



