68 appendix. 



Thynnus pulchralis. 



Male. Length 7~7% lines. — Head and thorax yellow ; the 

 vertex and thorax with a fulvous tinge above, the mesothorax 

 black at the sides and beneath ; the six basal joints of the an- 

 tennae ferruginous, the scape w r ith a yellow spot in front ; the 

 mandibles rufo-piceous at their apex. The anterior tibiae and 

 tarsi ferruginous, and the femora with a yellow stripe at their 

 apex beneath ; the wings hyaline, with their base brown. Abdo- 

 men black and shining ; the base and four basal segments yellow 

 above, with the sides above each in succession blacker to the 

 fourth, the third and fourth with also a pale yellow spot, a tinge 

 of fulvous colour on the three basal segments; beneath, the 

 basal segment has a triangular white spot in the middle ; the 

 second segment is white, with a black spot in the middle of its 

 base ; the third segment with a transverse white spot on each 

 side of its apical margin ; the fourth segment with two minute 

 spots at its apical margin. 



Hab. Adelaide. 



Thynnus (Agriomyia) Tryphonoides. 



Female. Length 3 lines. — Ferruginous, shining, the head 

 sparingly punctured ; the prothorax deeply excavated above ; 

 the metathorax transverse and abruptly truncate ; the abdomen 

 delicately punctured. 



Hab. Adelaide. 



The male of this species is described at p. 34. 



Thynnus (Agriomyia) flavescens. 



Male. Length 4| lines. — Head black ; the orbits of the eyes, 

 a V-shaped mark between the antennae, the clypeus and man- 

 dibles, yellow. Thorax yellow ; three black spots on the pro- 

 thorax; a broad stripe on each side of the mesothorax, a bilobed 

 spot in front, a large spot beneath the wings, and the pectus, 

 black ; the scutellum and metathorax yellow, both black at the 

 base, the latter has also a black spot in the middle ; the tibiae 

 and femora ferruginous, with the tarsi dusky; wings hyaline, 

 the nervures black. The abdomen yellow, with a black band at 

 the base of the segments, which is produced into an angular 

 point in the middle; each segment has also a short narrow trans- 

 verse line on each side ; the black band broadest on the apical 

 segments. 



Female. Length 2j lines. — Yellow, with the head obscure 

 rufo-fuscous ; the metathorax black, transverse, with its margins 



