256 REVISION OF THE THYNNID^ OF AUSTRALIA, I., 



abdomen shining. ^Yings liyaline, iridescent, nervures black. 

 Length 10 mm. 



The third cubital cell subtriangular, l)eing very short along 

 the radial nervure. 



Hah. — Victoria (French). 



L. TRiSTis Sm. 



Thynmis {Agriomyia) tristis Sm., Cat. Hym. B.M. vii.p.34,n.88. 



(J. Head densely punctured; the clypeus with a longitudinal 

 carina from the base to the centre, where it is produced into a 

 tubercle. The anterior margin of the prothorax raised, the 

 scutellum transversely truncate at the apex; the whole thorax 

 closely punctured, most finely on the prothorax. Median seg- 

 ment finely reticulate, almost smooth at the base. Abdomen, 

 finely and closely punctured, the epipygium rugulose. Entirely 

 black. Wings hyaline, iridescent, nervures dark fuscous. 

 Length 12 mm. 



The antennae are shorter and stouter than in most species of 

 the genus. 



Hah. — Australia. 



L. FALLAX Sm. 



Thynniis fallax Sm., Cat. Hym. B.M. vii. p.35, n.91, 1859((J). 



A pair from Adelaide in the Hope Collection at Oxford. 



The male differs from the type in having the space at the base 

 of the median segment punctured instead of smooth and shining. 

 The scutellum is rather narrowly truncate at the apex. 



9. Head rectangular, rather longer than broad, \evy sparsely 

 and finely punctured, shining. Thorax and median segment 

 shining, sparsely and finely punctured; the prothorax almost 

 square; the median segment longer than the prothorax, the sides 

 almost parallel, obliquely truncate posteriorly. Abdomen shining, 

 more densely punctured than the thorax, the first segment 

 vertically truncate anteriorly, and with a small acute tubercle at 

 the base beneath. Epipygium narrowlj^ rounded at the apex, 

 with a slightly raised, broad median carina. The abdomen is. 



