433 



Robini Clap., on roots. Glyciphagvs fccularum Gur., on potatoes. Hypopus 

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

 themselves to insects by their suckers. 



Fam. Ixodidse. Ticks. Larger usually blood-sucking mites, with strong 

 dorsal shield and large, protrusible toothed chelicerae. The pedipalpi are three- 

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



a d 



FIG. 385. Sarcopttn tcaliei (after Gudden). a, Male from the ventral side, b, Female from 

 the ventral side, c, Female from the dorsal surface, d, Larva. f, Chelicerse; '", 

 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 tracheae. The Ticks live on 

 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 arc 

 amongst the most troublesome parasites. Ixodes ricinus L. I. reduvivs, 



