NOTES ON BIOLOGY OF SOME MUSCOID FLIES. — JOHNSTON. 87 



egg deposition to emergence ranged from 15 to 20 days ; and 

 that oviposition occurred in from 12 to 17 days after emergence. 



Pierce (1921, p. 131) stated that the eggs required 10 to 

 24 hours to hatch ; the larva 7| to 8 days at 23° C. (73-5° 

 Fahr.) ; and the pupa 14 days for development, though larvse 

 had been known to attain full development in from 3 to 4 

 days and the flies to emerge in from 15 to 20 days after the 

 eggs had been deposited. (See also Hewitt, 1914.) 



Sarcophaga spp. 



Flesh-flies are to be met with in Brisbane throughout the 

 year but are particularly plentiful during March and April. 

 They are larviparous. The larval feeding stage occupies 

 about 4 or 5 days during summer. The pupal stage is greatly 

 prolonged during winter, some of our specimens taking from 

 8 to 16 weeks before emerging. Overwintering evidently 

 takes place in the pupal condition. From 12 to 18 days elapse 

 during summer between larviposition and the emergence of 

 the adult. In 2 or 3 days after emergence copulation occurs. 



Herms (1915, p. 238) states that under optimum conditions, 

 presumably at Berkeley, Cahfornia, Sarmphaga sarracenice 

 Riley requires 5 days for its larval development and 13 for the 

 pupal, a total of 18 days from larviposition to emergence. 



Sarcophaga peregrina R. D. 



