THE CHEESE MITE 177 



deposits a pupa in the cell beside the young 

 larva of the bee, and that the young Braula 

 appears as a perfect insect in 21 days. 



It is Packard's opinion that on the day the 

 larva hatches from the egg it sheds its skin 

 and turns to an oval puparium of a dark 

 brown colour. 



By comparing the antennae with those of 

 the sheep tick a resemblance will be noticed, 

 though they are not so completely concealed 

 in their cavities. 



In the original photo-micrograph this para- 

 site is (Fig. 57) shown with an amplitude of 

 220 diameters; the focal length required was 

 66 inches; an eye-piece of 5 diameters and 

 a 1-inch objective were used. 



The Cheese Mite. 



The name by which this creature is now 

 known is TyroglypTius siro. The creature is 

 classed with Ixodes, and therefore belorigs to 

 the Acarina. It has a peculiarly-shaped pro- 

 boscis in the form of a cone. It possesses 



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