HYMENOPTERA. 31 



tured ; beneath, smooth and shinuag ; the apex terminating in 

 a lanceolate appendage. 

 Hab. Australia. 



78. Thynnus (Agriomyia) umbripennis. B.M. 



Male. Length 5 lines. — Black and closely punctured ; the 

 head and thorax subopake ; the abdomen shining ; wings dark 

 brown, with a violet iridescence. Abdomen : the segments with 

 their margins deejjly constricted; beneath roughly ]ninctured, 

 the punctures conlluent ; the sixth ventral segment with a stout 

 angular tooth on each side ; the apical segment with deep coarse 

 punctures, and terminating in a tridentate process. 



Hab. Australia. 



79. Thynnus (Agriomyia) fervens. B.M. 



Male. Length 54 lines. — Black : head and thorax very closely 

 punctured and subopake ; the abdomen with distant very shal- 

 low punctures, and shining black ; the mandibles, tibiae, tarsi, 

 and knees ferruginous ; the apical joints of the tarsi dusky ; 

 wings fulvo-hyaliue, the nervures ferruginous; the head and 

 thorax wdth a thin pubescence, which is pale fulvous on the 

 disk and cinereous on the sides and beneath. Abdomen : the 

 margins of the segments constricted ; the apical ventral segment 

 terminating in an angulated appendage which has a minute 

 tooth at its apex. 



Hab. Australia. 



80. Thynnus (Agriomyia) tenuatus. B.M. 



Male. Length 7 lines. — Black, subopake, very closely punc- 

 tured, and thmly covered with hoary pubescence ; the man- 

 dibles shining black ; the tarsi obscurely ferruginous beneath, 

 the spines of the tarsi and the calcaria ferruginous ; the wnigs 

 hyaline, the nervures black ; the abdomen longer than the head 

 and thorax ; the basal margin of the segments of the abdomen 

 depressed ; the apical segment with a triangular shape in the 

 middle of its base, beneath which it is concavely truncate, and 

 then is oblique to the apical margin, the triangular shape and 

 the oblique portion longitudinally grooved ; the basal segment 

 not spined beneath or toothed, the segments slightly concave, 

 the apical one obtuse. 



Hab. Australia (Swan River). 



This species has very much the aspect of a Rhagigaster, but, 

 as the description shows, it is a true Thynnus. 



