360 



ZOOLOO T. 



after a moult. A typical mite, tlioiigh above the average 

 size of the members of the group, is the tick (Fig. 312), 

 Ixodes alUpidus Pack. Closely allied to this is Ixodes bovis 

 Riley, the cattle-tick (Fig. 313), which buries its head in 



Fig. 314.— Sugar-mite. Much en- 

 larged. 



TPig. 313.— Ixodes bovis. Natural size and 

 enlarged. 



Fig. 315. — AmmofrhoU pycnogm.oides. a. 

 stomach with cceca {b. h. l>. b) extending 

 into the legB.— From Gegenhaur. 



Fig. !IK. —Pentastoma v„ 

 Natural size. — From Verrill. 



the skin, anchoring itself firmly by means of the backward- 

 pointing teeth of its jaws. Other examples of mites are the 

 cheese and sugar mites (Fig. 314, Tyroglypliios sacchari). 

 The sea-mites, Pycnogonidm, are marine forms, without 



