HYMENOPTERA. 33 



narrow line on each side, a spot on the tegulae, a minute one on 

 the scutellum, and the post-scutellum, yellow ; wings subhyaline, 

 nervures fuscous. The base of the abdomen black, the margins 

 of the segments deeply constricted ; an oblong yellow spot on 

 each side of the second and third segments ; beneath, the apical 

 ventral segment rounded at its apical margin and with a minute 

 tooth in the middle. 



Hab. Australia, 



84. Thynnus (Agriomyia) cryptoides. B.M. 



Male. Length 4 lines. — Head and thorax black, the legs and 

 abdomen ferruginous ; the five or six apical joints of the antennae 

 arcuate; the orbits of the eyes interrupted at their vertex, the 

 clypeus, margins of the face on each side of the clypeus, and 

 the mandibles, yellow ; the base of the clypeus black. Thorax 

 bright shining black ; the mesothorax punctured; the metathorax 

 delicately transversely aciculate ; the margins of the prothorax 

 slightly interrupted in the middle, a spot on the mesothorax, an 

 angular spot on the scutellum, a lunate one on the post-scu- 

 tellum, yellow; the coxae black, with their apex and the outside 

 of the intermediate and posterior pairs ferruginous ; the wings 

 hyaline, the nervures ferruginous. Abdomen : the base black 

 and subpetiolate ; the apical ventral segment lanceolate, with 

 a minute curved black spine at the apex. 



Female. Length 2^ lines. — Ferruginous : the thorax and the 

 third, fourth, and fifth segments of the abdomen more or less 

 fuscous ; the head and the tibiae and tarsi pale ; the head smooth, 

 the thorax punctured ; the second segment of the abdomen with 

 four deep transverse grooves, the following segments with scat- 

 tered shallow punctures. 



Hab. Australia (River Plenty). 



85. Thynnus (Agriomyia) volatilis. B.M. 



Male. Length 4-j lines. — Black, with the abdomen and legs 

 ferruginous. The anterior margins of the face and clypeus, the 

 mandibles, a spot above the insertion of each antenna, and a 

 very narrow line at the inner orbit of the eyes, yellow; an 

 obscure ferruginous line on the posterior margin of the vertex, 

 more or less interrupted. The anterior and posterior margins of 

 the prothorax very narrowly testaceous ; wings hyaline, their 

 nervures fusco-ferruginous ; the coxae, trochanters, and base of 

 the abdomen black. 



Hab. Australia. 



c5 



