the AsiliJa} of Australasia. 353 



species of Diodria, tliougli it bears a general resemblance 

 to the genus and has a long third anteunal joint ; but the 

 fore tibite are armed witli a very distinct curved spine. It 

 cannot belong to the genus Cyrtophrys, Loew, the antentKB 

 having no apparent style. The abdomen is black, reddish at 

 the apex. 



Table of Genera. 



1. Fore tibife with a curved spine at apex 2. 



Fore tibiae -with uo curved spine at apex .... 3. 



2. Bhie-black species marked with white abdo- 



minal spots. Moustache usually reaching 

 nearly to antennaj, tubercle distinct on face . Therenfria, Loew. 

 Small species. Moustache confined to oral 

 opening, no tubercle on face Metuhtphria, g. n. 



3. Posterior transverse vein in a straight line, or 



almost so, with the vein closing discal cell. . 4. 

 Posterior transverse vein not so placed 6. 



4. Third joint of antennte notched at apex, usually 



with a spine Clariola, Kertesz. 



Third joint of antennae not notched 5. 



5. Abdomen punctuate, third joint of antenu£e 



longer than the first two joints together .... Atumosui, Macquart. 

 Abdomen hardly punctuate, the third joint 

 three times as long as ihe first two joints 



together Aphedia. 



G. First posterior cell closed or ver}' narrow. 



Abdomen bare Kusa, Vv'alker. 



First posterior cell wide open or not very 



narrow 7. 



7. ^Mjustache confined to oral opening. Head 



orbicular, very much excised behind Muira, Schiner. 



Moustache not confined to oral opening. Head 

 semicircular, not usually so much excised 

 behind Laphria, JNIeigen. 



TiiERErxRiA, Loew, 

 Progr. Pieaischule Meseritz, 18ol, p. 20 (1851), 

 Scandon, Walker, Ins. Saund., Dipt. i. p, 108 (1851). 



This genus was formed by Loew for a new species from 

 Australia, viz. Tliereutria calcar, which Loew made the 

 type of the genus. He separated the genus from Laphria 

 by the presence of the curved spine on the fore tibiae. It is 

 as yet peculiar to the Australasian region. The species are 

 di.^tinguished by the blue-black abdomen often marked with 

 white spots, by the blue-ljlack legs, the tibite or femora 

 often yellow, the latter usually stout, curved, i\\Q face with a 

 prominent tubercle covered by the thick moustache, with 

 often long hairs continued to the base of the antennce'vi\nc\\ 



