74 LIFE HISTORY OF HABRONEMA. 



IV. — MuscA HiLLi Jnstn. and Bancroft, 1920. 



This is a rather uncomiiion fl}^ which occurs in the 

 Eidsvold and Brisbane districts. It breeds readil}' in 

 oaptivity. Under experimental conditions specimens 

 became parasitised ])y Habronema when bred out from 

 infected material, both //. mu-'icce and H. megastoma being 

 found. 



Many flies belonging to this species were bred out 

 {January and February, 1920 — Eidsvold and Brisbane) 

 from sterilised horse dung and allowed to oviposit — some 

 on sterilised material and some on fresh, untreated dung 

 from a Brisbane stable (February 20th), larvae maturing 

 on 26th February, flies emerging on 2nd to 4th March. 

 Those bred from sterilised manure were not infected, while 

 of eighteen examined from untreated dung fifteen were 

 found to have been parasitised by Habronema, Ijoth 

 H. muscce and H. megastoma being reiDresented. The 

 number of worms present in infected flies ranged from three 

 to nine, with an average of about five. 



V. to VIII. — Flies other than Musca spp. acting as 

 HOSTS FOR Habronema. 



V. — Pseudopyrellia sp., a large bluish green Muscid 

 fly which becomes cobalt-blue when dead. ( Lasiopyrellia sp. 

 in Johnston and Bancroft, 1919, p. 182). This siiecies 

 usually oviposits on cow dung, but a few specimens have 

 also been bred naturally from horse dung. If Ijred on 

 infected material this fly becomes parasitised by Habrojiema. 

 Thus six flies bred partly on cow dung and jDartl}- on 

 infected horse dung proved on examination to have been 

 invaded by Habronema. In five, examined on the day 

 of emergence, most of the worms were in an early stage 

 oncysted in the abdomen. In one fly several daj-s old 

 the worms were free and in the final stage, both //. muscce 

 and H. megastomu being identified. 



\l.—~ Anastellorhina augur Fal>r. This common blow 

 fly has not been found breeding naturally in cow 

 or horse dung, but a number of small larvae which had 

 been deposited on meat, when removed to horse dung 



