NOTES ON BIOLOGY OF SOME MUSCOID FLIES. — JOHNSTON. 

 Ophyra nigra. 



S9 



position 

 Adult longevity . . 22-29 20-28 



28 22-29 20-29 



StomosTxs calcitrans L. 



We have not attempted to a.seertain the length of the 

 various stages in the hfe-cycle of the stable-fly. The time 

 which elapsed between the deposition of eggs and the emergence 

 of the adult fly from them in Brisbane Avas found to be from 

 14 to 19 days during January and February, 20 to 33 during 

 April, 24 to 40 during winter (May to October), 20 to 21 during 

 November and December. The usual time in S. E. Queensland 

 seems to be about 20 days during summer, though less in 

 midsummer, increasing to from 3 to 5 weeks during winter. 

 Hill's data (1918) show that a total of 21 days elapsed in 

 Melbourne during January and February. 



Bishopp (1913, 1916, 1920) has investigated the biology 

 of *S^. calcitrans in Dallas, Texas, U.S.A. During late autumn 

 (Sept. and Oct. 1912) he found that the egg period ranged from 

 1 to 4 days ; larval from 1 1 to over 30 ; pupal 6 to 20 ; the 

 time elapsing from oviposition to emergence being from 19 to 

 over 42 days (1913, p. 121-2). In a later paper (1916), he gave 

 a more complete account and stated (p. 17) that on the average 

 the last-named period generally ranged from 21 to 25 days 

 when conditions were very favourable ; that the longest 

 period observed for complete development was 43 days, though 



