BV R. J. TILLVAHb. 821 



recording the discovery of two very distinct new species of this 

 family, each of which will form the type of a new genus. The 

 first of these was taken by Mr. G. H. Hardy, late of the Tas- 

 manian Museum, Hobart, during a visit to Maria Island in 

 December, 1915. Only a single specimen was taken; but it is 

 in good condition, except for the loss of the antennae. The 

 second is a remarkable slender form, taken at light in December, 

 1916, on Mount Tambourine, South Queensland (elevation 1900 

 feet) by Mr. W. H. Davidson. Not realising what a prize he 

 had got, Mr. Davidson unfortunately enclosed this specimen in 

 an envelope with a letter to me; with the result that, when I 

 received it, the insect was completely flattened out, and other- 

 wise damaged. However, I managed to relax and set it, though 

 the pin had to be inserted through the thorax from side to side, 

 the wings being extended at right angles to the flattened thorax. 



I have delayed publishing these fine discoveries, in the hope 

 that further material might be obtained in better condition. 

 Mr. Hardy again visited Maria Island last year, but he failed to 

 find any further specimens of the new Sialid; likewise Mr. 

 Davidson, who has kept a sliarp look-out for his new species, has 

 met with no further success. As the new insects are of great 

 scientific interest, further delay is no longer justified. 



The following key will enable the two new genera to be dis- 

 tinguished from each other and from the two genera already 

 described, at a glance : — 



Wings about one-third a.s broad as long, tlie costal Held of the 



forewing noticeabl3- broadened .. 2. 



Wings much narrower, the costal field of the fore wing not 

 noticeablj'^ broadened 3 



THindwing with M1+2 ^^d M3 f 4 both simple veins Sin/is Latr 



(2) - 



jHindwing with M1+2 forked, M3 , ^ simple Aas(ro^iui/,s, u.ir. 



ith K2-f3 and K4 f 5 both forked Sltnosial it<, n.g. 



with R2-}-3 simple, and Ri-fo forked ... Profo^ia/is Weele. 



(1) 



TBoth wings w 

 j Both wings w 



AusTROsiALis, n.g. (Text figs. 1-2). 



Closely related to Sialis Latr. General colouration black, 

 with orange-red prothorax and smoky wings. Forewing with 



