i8 99 .] 



REFERENCE WORK 



265 



to you to ask), very much like this specimen also set by Mr. 

 Norman, with the wings as they are at present at rest, but 

 showing the fore-nerves very nicely. I incline to think 

 that if this be certainly 0. avicularia, that it would suit better 

 for figuring than the previous specimen as being in the same 

 position as my H. equina and L. cervi, both $ and ? in 

 previous Annual Reports. If you could oblige me with the 

 two slides together I could make what personal observations 

 I want ; have which ever seems best figured, and afterwards, 

 if one or both are of interest to you, I would very gladly beg 

 your acceptance. I daresay you will be good enough to let 



i, Grouse fly, magnified, with line showing natural length ; 2, pupa- 

 rium, magnified and natural size ; 3, end view, magnified ; 4, claw, 

 magnified. 



FIG. 69. GROUSE FLY, ORNITHOMYIA AVICULARIA, LINN. 



me use your interesting short note about finding the speci- 

 men of avicularia alive in the box with the Horned owl. 



I am working now on Piophila casei, Linn. (Cheese and 

 Bacon fly, fig. 12), and hope to make a good paper, with 

 some original observations of my own. Is it not a note- 

 worthy circumstance that besides undoubtedly breeding in 

 myriads in stores of cheese and bacon, that also they come 

 in through the windows in such numbers that wire gauze, or 

 equivalent, is a recognised protective measure ? I think this 

 points to there being some home of P. casei that wants look- 

 ing up. 



