ACARINA. 



493 



AW//'/// Clap., on roots. GrlycipTiagv& fecularum Guer.. on potatoes. 7r///>nju/.t 

 Dug., according to Megnin ami Robin, contains larval forms, which attach 

 themselves to insects by their suckers. 



Fain. Ixodidae. Ticks. Larger usually blood-sucking mites, with strong 

 dorsal shield and large, protrusible toothed chelicerEe. The pedipalpi are thrce- 

 or four-jointed and club-shaped; their bases are joined together to form a 



a d 



Km. :5. Surcoptes ncabiei (after Gudden). n, Male from the ventral side. //, Female from 

 the ventral side, c, Female from the dorsal surface, d, Larva. Kf, Cheliceree; -B'", 

 third pair of legs. 



proboscis, bearing recurved hooks (fig. 387). The slender legs end with two claws. 

 Two simple eyes are often present. Respiration by tracheas. The Ticks live <m 

 the underwood in forests. The females crawl on to Mammalia and Man, suck 

 blood, and become much swollen out. The young, when hatched, have three 

 pairs of legs. In tropical countries the Ticks are of considerable size, and are 

 amongst the most troublesome parasites. I.nnlrx r'n-innx L. 1. 



