HARDV. 15 



Sub-family M1CR0D0NTINAE. 



Genus Microdot! Meigen. 



Thrpe species of the genus Microdot) occur on the eastern side of Australia, 

 and two of these extend into Tasmania. They can be recognised readily by the 

 proportion of the antennal joints and in addition M. variegata Walker differs 

 from the other two species by having a club-formed abdomen. 





Average length of joints of 





Species 





the antennae. 





Remarks. 





1st. 



2nd 3rd. 



Total. 





.1/. viltalus 



.5 nun 



.2 nun 



.5 nun 



.1.2 



Third joint as long 

 as the hrst. 



M. pictipennis .... 



.0' 



.2 



.9 



1.7 



Third joint one and 

 one half times the 

 length of the first. 



M. variegata • ■ 



.8 



.15 



2.6 



3.55 



Third joint threa 

 times the length 

 of the first. 



Microdot! pictipennis Macquart. 



Aphritis pictipennis Macquart, Dipt. Exot, suppL 4, 1850, p. 129, pi. xii, fig.. 12. 

 Hob. — Tasmania and New South Wales. 



Microdon vittatus Macquart. 



Aphritis vittatus Macquart, Dipt. Exot., suppl. 4, 1850, p. 129. 

 Eumerus transiens Walker, Ins. Saund. Dipt., 1852, p. 225. 



Microdot), brachycerus Knab and Malloch, Trans. Roy. Soc. 6'. Austr., xxxvi, 

 1912, p. 235. 



Synonymy. — In his description Walker states that a stump of a slightly 

 curved vein proceeds from the upper side of the second submarginal cell ; in 

 modern terms this refers to the appendix of the cubital vein in the first posterior 

 cell and denotes that the species is a Microdot!. A specimen from Sydney agrees 

 with Walker's description in every detail. 



Hab. — Tasmania, Victoria and New South Wales. 



Microdot! variegata Walker. 



Ceratophila va'iegata Walker, Ins. Saund. Dipt., 1852, p. 220, pi. i, fig. 6. 

 Mixogaster aphritinus Thomson, Eugenies Resa, Dipt., 1868, p. 491. 

 Microdot) daveyi Knab and Malloch, Trans. Roy. Soc. S. Austr., xxxvi, 1912 

 p. 233. 

 Hab. — New South Wales and Victoria. Two specimens from Victoria are in 

 Dr. Ferguson's collection. 



Sub-family ER1STALINAE. 



Genus Orthoprosopa Macquart. 



Orthoprosopa Macquart, Dipt. Exot., suppl. 4, 1849, p. 153. 



Characters. — This distinct genus appears to be unique to Australia; it con- 

 tains one rather bare species with an open subcostal cell; the eyes are bare, 



