AUSTRALIAN BLOOD SUCKING FLIES. 243 



or quite half way to wing margin; anal cell closed immedi- 

 ately before wing margin. Length 5*5 mm.; antennae 

 1*35 mm., third joint *32 x '16 mm., arista *87 mm. 



Hab. New South Wales, Gosford, Mount Wilson (Dr. J. B. 

 Oleland). 



Specimens were taken by Dr. Oleland on May 24th, 1914, 

 in company with S. marginipennis on the Mangrove Moun- 

 tain road near Gosford. Additional specimens were also 

 procured on the Mount Wilson-Mount Irvine road about 

 two miles from the former place (6/6/1915). Both Mount 

 Wilson and Mount Irvine have basaltic caps with corres- 

 ponding brush formation — the specimens were however 

 taken on the sandstone formation which outcrops on the 

 road, and none were seen in the bush. 



It is probably this species or S. marginipennis or possibly 

 both, to which Mr. Gallard of the Agriculture Department 

 alluded in a communication to Dr. Oleland in 1911. Mr. 

 Gallard met with them at Ourimbah (Gosford district) in 

 June, and says: — "They frequent the scrubby land where 

 the wallabies are generally found, and we call them wallaby 

 flies. If you bare any part of you, they attack you like a 

 mosquito, and their bite is far worse." S. longicomis is 

 closely related to S. clelandi, but the larger size and longer 

 antenna should prevent the two species being confused. 

 Explanation of Plate XXVI. 



1. Symniopsis longicomis, n. sp. <? 



2. ,, marginipennis, n. sp. $ 



3. ,, longicomis, n. sp. Wing. 



4. ,, marginipennis, n.sp. Wing. 



5. „ clelandi, n. sp. Wing. 



6. ,, vexans, n. sp. Wing. 



7. „ longicomis, n. sp. Antenna. 



8. ,, marginipennis, n. sp. Antenna. 



9. ,, clelandi, n. sp. Antenna. 



10. ,, vexans, n. sp. Antenna. 



11. ,, tabaniformis White. Antenna. 



