XOTES ON BIOLOGY OF SOME MUSCOID FLIES.— JOHNSTON. 81 



emergence of the adult fly being from 16 to over 60 days, 

 generally 24 days ; and the average longe^aty of the fly about 

 30 days. Pierce (1921, p. 132) mentioned that the larval 

 period averaged 14 days and the pupal about the same length, 

 but that in warm weather in Texas the larval stage occupied 

 3 to 12 days and the pupal 5 to 16 days while the total develop- 

 ment (to emergence) required 11 to 24 days. Bishopp (1915, 

 p. 323) stated that in Eastern Texas incubation required less 

 than 24 hours in summer but up to 7 days in winter ; the 

 larval stage 3 to 9 days ; pupal 3 to 13 ; egg to emergence 

 of adult 9 to 21 days during comparatively warm weather ; 

 and that oviposition occurred in from 5 to 9 days after emer- 

 gence. 



Patton (1922a) mentioned that in India the eggs of Lucilia 

 serenissima F. incubated in from 24 to 36 hours according to 

 temperature. 



Chrysomyia albiceps Wied. 



This is the adult of the larger so-called hairy maggot and 

 is one of the worst of the sheep blowflies in New South Wales 

 and Queensland, where it is generally known as Pycnosoma or 

 Chrysomyia rufifacies. It is most abundant in Brisbane during 

 January and February, while in sheep districts of Central and 

 Western Queensland it is especially in evidence during March, 

 April, and May and may occur in numbers even in June. 



]\Ir. Froggatt (1921, p. 811 ; 1920, p. 472) has lately used 



the name Chrysomyia albiceps Wied, as being its correct name, 



the determination having been made by Patton, who mentioned 



that it was a common Indian species. The latter author 



(1922c) has just published an account of the fly and its larval 



stages. 



Chrysomyia albiceps. 



