HYMENOPTERA. 27 



orbits of the eyes, white ; a minute white spot in the middle of 

 the posterior margin of the vertex. Thorax : a narrow line on 

 the anterior margin of the prothorax, a spot on the tegulse, a 

 triangular minute one on the mesothorax touching the scutellum, 

 and the post-scutellum, white ; wings subhyaline, faintly clouded 

 towards their apex. Abdomen : an irregular- shaped white line 

 in the middle of the second and two following segments, inter- 

 rupted in the middle ; the lines on the second segment emar- 

 ginate beneath, those on the two following segments interrupted ; 

 the fifth segment with two minute dots ; beneath, the basal seg- 

 ment produced into a white conical tooth in the middle of its 

 apical margin, the three following segments with a transverse 

 emarginate stripe in the middle and a minute dot at the extreme 

 lateral margins ; the fifth segment with two minute dots, or im- 

 maculate. 



Hab. South Australia. 



The white markings on the abdomen vary in different indivi- 

 duals in being more or less obliterated ; and examples are not 

 uncommon with the legs red, as observed by Mr. Bakewell, who 

 captured several pairs of the sexes. 



69. Thynnus (Agriomyia) albo-maculatus. B.M. 



Male. Length 71 lines. — Black : head and thorax closely 

 and strongly punctured and subopake ; abdomen shining black. 

 The clypeus and a line on each side, terminating at the margin 

 of the eyes, and a spot at the base of the mandibles, yellow; the 

 prothorax yellow, with a central and a lateral black dot; a square 

 spot on the mesothorax, a spot on the scutellum and two on 

 each side of it, the post-scutellum, an irregular stripe beneath 

 the wings., the tegulse, and two oblique spots on the metathorax, 

 yellowish-white. Abdomen shining : the first segment with a 

 minute white spot on each side ; the second, third, and fourth 

 segments with an oblong transverse subquadrate spot on each 

 side ; the fifth segment with a narrow line on each side ; each 

 segment has a transverse impressed line a little before its apical 

 margin ; beneath, the second and two following segments with 

 transverse white spots on each side and an impressed line before 

 their apical margins; the basal segment produced into a conical 

 tooth in the middle of its posterior margin. 



Hab. Australia (Adelaide). 



Probably in some examples the markings on the thorax 

 would be white ; in the specimen described they appear dis- 

 coloured. 



c2 



