CHEESE MITES, ETC, 



275 



avSE Tyroglyphus malus {Shimer, from Riley's 5th Missouri Report, 1873, 87). 



No. 16. 



16. Magnified sketch of ditto, from Riley's figure. 



Y ^ 



Tyroglyphus malus, side view. Copied from Riley's figure. Ditto, under side. Copied from ditto. 



A North American species, said to have been useful in some 

 places (Georgia) in clearing away the mussel-shell Bark louse 

 {Mytilaspis pomicoi'ticis of American authors) from the bark of 

 apple trees. From the figure it appears to be narrower and more 

 elongate than any of our species. There is no doubt, however, 

 as to the genus to which it belongs j the smooth body, trans- 

 verse line dividing it, the tarsal cla.w, &c., all sufficiently indicate 

 it to be either a Tyroglyphus, or a Rhizoglyphus. Mr. Riley's, 

 beautiful figure is not on a sufficiently large scale to allow us to- 

 make out which. 



Tyroglyphus translucens (Acaras translucens, Nietner ; Enemies of the 

 coffee tree, 1861). 



It appears that other mites with similar beneficial tendencies are 

 found in other parts of the world. M. Nietner mentions one 

 under the name Acarus translucens, as preying on the cocci that 

 infest the coffee plants in Ceylon, and his notice would seem to- 

 indicate that this is most probably its proper place. He says it is 

 a very minute whitish translucent mite, that is mixed up with the 

 scale insects, and no doubt injures them. On examining old full- 

 grown scale insects, the shells were often found to be filled, not 

 with eggs, but with a white flakey substance, among which the 

 above mentioned mite moved about. 



s 2 



