34 EXPERIMENTS WITH CERTAIN DIPTERA. 



The work of Breinl and Xicoll has shewn that the 

 larvae can penetrate both the capsule of the nodule and 

 also the skin of the heast. It is also possible that the larvae 

 may travel in the lymphatics and reach a surface where the 

 skin is tender, e.g., round the lips and eyes. If this were 

 the case, their ingestion b}^ certain non-blood-sucking 

 flies would be very probable, since such are commonlj' to 

 be found round these mucous surfaces. Re-inoculation 

 of the beast would occur by the escape of the larvae from the 

 fly. A\"hile the latter was feeding at a mucous surface. 



The investigation centred on the one hand round 

 Tabanui circumdatus, the commonest Tabanid of the dis- 

 trict, and on the other around Musca fergusoni and, to a 

 less extent, J/, vetustissima, M. terroeregince, and a small 

 black Fannia sp. 



The method of procedure was as follows : — 



( Ij Attempt to infect fhes by feeding them on fresh 

 nodules. 



(2) Examination of wild flies. 

 Only the latter method \aelded at all interesting results, 

 the former being coiX'^istenth' negative. Although the 

 investigation failed in its main object there has been collected 

 a certain amount of information in regard to the helminth 

 parasites of the flies dealt with. 



Among the Tabanidse of the Eidsvold district (Upper 

 Burnett Eiver, Queensland), specimens of the following 

 species have been tak^n from time to time by Dr. T. L. 

 Bancroft, some of the identifications being made by E. 

 Austen, of the British Museum, and by F. H. Ta3'lor, formerly 

 of the Towasx-ille Tropical Institute, but for most of them 

 we are indebted to Dr. E. W. Ferguson, of the Bureau of 

 Microbiology, Sydney, who has undertaken to work out the 

 various species. There are at least 26 Tabanids, 19 belong- 

 ing to Tabanus (12 named and 7 not fully identified), three 

 to Sih'ius, three to Pangonia and on5 to Erephopsis. 



Erephopsis guttata Donovan 

 Pangonia auriflua Donovan 



., bancrofti Austin (Erephop.iis hancrofti Taylor) 



concolor Walker 



