98 PROCEEDINGS OF THE ROYAL SOCIETY OP QUEENSLAND. 



the Brisbane district, but generally only a few pupse of the 

 species can be collected even from considerable quantities of 

 cow-manure during winter. The pupae are to be found in- 

 the manure close to the surface. The species occurred most 

 commonly during March and April. 



Additional observations during 1919 and 1920 regarding 

 the life-cycle may be mentioned — (a) days in larval stage, (6) 

 length of pupal stage, (c) total time elapsing between larviposi- 

 tion and emergence : — 



The total cycle in Brisbane apparently requires about 10 

 days for its completion during summer, and over a month during 

 Avinter. The pupal stage occupies about 8 days during summer 

 but about 4 weeks during wdnter, though our longest record 

 was 39 days. There is a marked lengthening of the larval 

 period during winter months. Flies kept in captivity during 

 winter lived for periods varying from 10 to 31 days, usually 

 about 24 days. 



Musca terras-reginse Jnstn. and Bancroft. 

 The biology of this rather uncommon fly has been studied 

 by Johnston and Bancroft (1920a, pp. 34, 35 ; Johnston, 1921b), 

 whose observations were made chiefly at Bids void, Upper 

 Burnett River, the results obtained being practically the 

 same as those ascertained in the case of Musca domestica when 



