CHAPTER VII. 

 SOME INSECTS AFFECTING CHEESE, HAMS, FRUIT, AND VINEGAR. 



By L. O. Howard. 



THE CHEESE, HAM, AND FLOUR MITES. 

 (Tyroglyphus longior L. arid T. siro Gerv.) 



Very minute, more or less colorless, eight-legged creatures swarm in 

 numbers over and in old cheese and various stored products, such as 

 dried meats, dried fruit, vanilla, and flour of different kinds. The 

 species may be distinguished by the illustrations. Tyroglyplius longior 



Fig. 



-Tyroglyphus longior : o, female; b, male— greatly enlarged (after Canestriui). 



is more rapid in its movements, larger in size, with longer and more cyl- 

 indrical body, and longer and more numerous shining hairs sticking out 

 on the sides. The two species are frequently found feeding in common. 

 Both species are common to Europe and the United States, and both 

 have probably been carried to all parts of the world in food supplies. 

 100 



