626 DIPTERA OF AUSTRALIA, 



Genus Dynatosoma, Winnertz. 



Dynatosoma, Winn., V. z. b. G. Wien, XIII., p, 947, pi. xxi., 

 fig, 37, 1863. 



Head, on account of the height of the vertex, somewhat longish- 

 round, flattened anteriorly, situated deep in the thorax ; front 

 broad, the anterior margin not triangularly produced. Eyes 

 somewhat longish-round. Ocelli large. Palpi porrected, incurved, 

 four-jointed ; the first joint small, the second and third almost 

 equally long, the fourth filiform, as long as or longer than the 

 second and third combined. Antenuse almost cylindrical, some- 

 what arcuated, porrected, 2-+ 14-jointed ; joints of the scapus 

 cyathiform, setiferous at the apex; flagellar joints cylindrical, a 

 little compressed from the side, with short downy pubescence. 

 Thorax oval, highly arched, with a short pubescence, longer hair 

 on the lateral borders and above the fore-coxse, setiferous on the 

 hind border ; scutellum semi-circular, setiferous on the border ; 

 metathorax acclivous, somewhat arched. Abdomen of the ^ with 

 six segments, of the ^ with seven segments, compressed from the 

 side, narrowed at the base ; anal segment of $ terminating in a 

 forceps ; ^ ovipositor with two small lamellse. Legs robust ; 

 femora, especially the hind ones, broadly compressed ; tibiae 

 spurred ; the fore pair with a short spine on both the inner and 

 the outer side ; the hind pair with three rows of stronger spines 

 on the outer side and one row of weaker spines on the inner side, 

 or else with only one or two stronger spines on the inner 

 side ; hind tarsi spinulose. Wings longer than the abdomen, 

 longish-oval, base rounded ofi", microscopically pubescent. Aux- 

 iliary vein running parallel with the first longitudinal vein, and 

 bent downwards into it ; costal vein not extending beyond the tip 

 of the third longitudinal vein ; small cross-vein situated before 

 the middle of the first longitudinal vein, and before or over the 

 base of the fork of the fourth longitudinal vein ; branches of the 

 fifth longitudinal not convergent, the base of the fork opposite or 

 beyond the base of the fork of the fourth longitudinal vein ; sixth 

 longitudinal very stout, long, broken ofi" under the fork of the 

 fifth longitudinal ; seventh longitudinal short. 



