BY G. H. HARDY. 4:5 



Berts albimaeulata, Walker, List Dipt. B.M. i., 1848, p. 



126. 

 Berts servillei, Macquart, Dipt. Exot. i. 1. 1838, p. 172, 

 PL xxi., fig. 1; and suppl. 1, 1846, p. 47. 

 (For* further references see Kcrtesz, Cat. Dipt, iii., 

 1908, p. 132.) 



If nb. — A very common speci( s which has been record- 

 ed from Queensland, New South Wales, Victoria, and Tas- 

 mania, and also from some of the Pacific Islands. 



Subfam. Pa< BYGASTERIN.fi. 



Characters. — The Australian Bpeci a of this subfamily 

 have short antennae, the third joint of which is swollen, 

 formed with a number of compact segments, and has a hair- 

 like arista; the abdomen is formed with live visibl 

 ments, and the wings contain three posterior veins. 



The four genera so far known to occur in Australia 

 differ in th'.' form of th i scutellum which is normal ami 

 without spines in Pachygaster, is produced into a spine in 

 Lonchegaster, has four spines in Evaza, and bas many 

 soines in Wallacea. 



Genus Pa< hyg aster, Meigen. 



Pachygaster, Meigen, 111. Mag. f. Ins.. ii., 1803, p. 266. 

 ' Id., Whit.-. P.L.S. N.S.W., xli., 1916, p. 96. 

 (For synonymy see Kerf -■/.. Cat. I>i|>t. iii., 1908, p. 9.) 

 Type. — Nemotelus ater, Panz Europe. 



Characters. — The antenna: are three jointed, and the 

 third joint is bulbous and consists of several much com- 

 pressed - gments terminating in a long arista; the scutel- 

 lum is without spin -; the wings contain three posterior 

 veins which issue from the disoal cell. 



Note. — White has a Tasmanian specimen of this p*enus 

 in his collection, hut he considered it to be a Lonchegaster 

 wit. ii the spines broken or deformed; this specimen should 

 now he in the British Museum, and probably belongs to 

 the species described below. Later White recorded the 

 genus from Victoria, hut did not describe th< spt ties. An- 

 other species is represent d by a specimen in the Macleay 

 Museum from Mt. Kembla, New South Wales, but until 

 further material is to hand it is not advisable to describe 

 this or the many other new diptera in this old collection, 

 most of which dates hack fifty years and more. 



The species descrihed here is named after the late 

 Arthur White. 



