12 



NOTES ON SOME AUSTRALIAN SYRFHIDAE (DIPTERA). 



By G. H. Hardy. 



Plate 1. 



The material dealt with in this paper covers all the sub-families known to 

 occur in Australia, except the Syrphinae. The species are studied mostly from 

 the writer's own co'lection, and specimens identified in other collections are re- 

 corded in the text. 



Insufficient material is to hand for the purpose of making a satisfactory re- 

 vision of the family, but some of the more important synonyms so far worked 

 out are recorded here, and an attempt has been made to construct a workable key 

 for such sub-families and genera as are known to the writer from Australia. 



The writer is indebted to Mr. C. E. Cole for pointing out that Microdon 

 brachyeerus Knab and Malloch is a synonym of M. vittatus Macquart; and also 

 that .1/. daveyi K. and M. is a synonym of M. variegata Walker. Specimens of 

 the latter in Dr. E. W. Ferg-uson's collection, and examined by the writer, cor- 

 roborate Mr. Cole's information. 



Two species are described as new; one of these belongs to a sub-family in 

 which no Australian species has previously been placed. 



Key to the Australian Syrphidae. 



1. The antenna with dorsal arista 2 



The antenna with a terminal style Cerioiclinae 



2. The intermediate cross vein situated before the middle of the discoidal 



cell Syrphinae 



The intermediate cross vein situated at or after the middle of the dis- 

 coidal cell 3 . 



3. The cubital vei.i v/ith a deep deflection encroaching upon the first pos- 



terior cell Eristalinae C. 



The cubital vein without a deflection; sometimes a veinlet issues from the 

 cubital vein into the first posterior cell 4. 



4. The cubital vein with a veinlet branching into the first posterior cell 



Microdontinae 

 The cubital vein simple, without a veinlet 5 . 



5. The antenna elongate, longer than the length of the head. Chrysotoxinae. 

 The antenna short, shorter than the length of the head Milesiinae. 7. 



ERISTALINAE. 



6. The subcostal cell closed Eristalis. 



The subcostal (sell open Orthoprosopa. 



