NOTES ON QUEENSLAND FLIES.— JOHNSTON AND BANCROFT. 



35 



;and pupate in damp sand under laboratory conditions. The pupariuni is 

 reddish brown and measures 4 to 5 mm. by 1-5 to 2 mm. The larval stage lasts 

 from 5 to 7 days, and the pupal from 7 to 10 days, the total thus being from 12 to 

 17 days during midsummer (Eidsvold, Burnett River), which is similar to that 



■of the house-fly. 



In bred flies the males were usually slightly in excess of the females, 

 about 51 per cent, being males and 49 per cent, females. When bred flies of both 



, sexes were kept together in a small cage and fed on raisins, honey, &c., copulation 

 was observed to take place in from 5 to 9 days after emergence (midsummer 

 observations), while the females were ready to oviposit about five days later. 



The female genitalia (fig. 41) closely resemble those of the house-fly, 

 except that the number of ovarian follicles is less, the maximum number 

 detected in each ovary being thirty-five. 



Parasites. — M. terrce-reginoi was found to be parasitised by a flagellate, 

 Jlerpetomonas (probably H. niuscce'-domesticce Burnett), and by three larval 

 -nematodes (Hahronema muscm Carter, H. megastoma Rud, and Agamospirura 

 muscarum Jnstn. and Bancr.). 



The following observation may be of interest as it allows one to compare 

 the various periods taken by the three flies M. terrce-reghue, M. vetustissima, 

 and M. domestica to pass through their larval stages in horsedung, since all 

 were under similar conditions, being bred in material from the same source and 

 (Collected at the same time (November, 1919, Eidsvold) : — 



MUSCA HILLI n. sp. 



(Text-figs. 3, 4, 11, 12, 16, 19, 20, 29, 30, 32, 39, 40, 46, 47, 48.) 

 This is an outdoor species which is occasionally found on horses and 

 -cattle in Eidsvold and also in Brisbane. We have also seen it at Tweed Heads, 

 N. S. Wales (March, 1920). The average length of full-grown specimens of 

 'either sex is about 6 mm. 



