PHYLUM ARTHROPODA 



01)5 



into the web by means of the 

 posterior legs. There are six 

 or eight eyes on the carapace. 



In the spider-like Phcdangiila, 

 or " Harvest-men," the cephalo- 

 thorax is not constricted off 

 from the abdomen. The cheli- 

 cersB are chelate, the pedipalpi 

 short and leg-like, the legs long 

 and slender. 



In the Acarida, or Mites and 

 Ticks (Figs. 546 and 547), the 

 distinction into regions is no 

 longer recognisable. The form 

 of the mouth parts varies some- 

 what in the different families. 

 Sometimes the basal portions of 

 the pedipalpi form a sucking 

 proboscis enclosing the stylet-like chelicera?, modified to form 

 piercing organs ; sometimes these appendages are claw-like or 



Itch mite (Sarcoptes Ecabisei). 



(After Leuckart.) 



Fic 547 —Water mite (Trombidium ftaiginosuiii), female chfl. ohelicerfe ; jW. pedipalpi. 



(After Leuckart.) 



chelate. The le^s vary somewhat in shape in the different group^, 

 according as they are used for prehension, for creeping, for running, 



