MYRIAPODA. 347 



Sugar-Mite (Tyroglyphus sachari), common in unrefined 

 sugar, the Cheese-Mite (Tyroglyphus siro\ the Flour- 

 Mite (Tyroglyphus farince), the Itch-Mite (jSarcoptes sca- 

 biei) ; the last being the insect which, by burrowing and 

 breeding under the skin, causes the loathsome disease 

 which bears its name ; and here also belongs the curious 

 Kose-Mite, which buries itself in the follicles of the hu- 

 mr.n nose. 



The last named is perhaps the lowest of the Mites, ex- 

 cepting only certain microscopic worm-like mites found in 

 standing water, and called " Water-bears " or Tardigrada. 



SUB-SECTION IV. 

 THE ORDER OF MYRIAPODA OR MYRIAPODS. 



THE name Myriapoda comes from two Greek words 

 murios, numerous, and pous, a foot, and is given to in- 

 sects which are long, and more or less worm-like in their 

 general appearance, and provided with numerous locomo- 

 tive- appendages. Their head is distinctly marked, and 

 similar to that of typical insects. There is, however, no 

 grouping of the segments into regions as in the two orders 

 of insects already noticed. They may perhaps be said to 

 represent, as regards their general form, the same idea 

 among insects that worms do among Articulates. 



The number of segments in the Myriapods varies in 

 the different kinds from ten to two hundred. These ani- 

 mals are divided into two Sub-orders : 



1. THE SUB-ORDER OF CHILOPODA (from the Greek 

 clteilos, a lip, and poits, a foot) includes rnyriapods 

 which have each segment simple, and bearing a single 

 pair of feet, and which have the head divided into two 

 regions, one before and the other behind the mouth. To 



