ORDER ACARINA : THE TICKS 



283 



in the Malpighian tubules of the tick, in a sort of latent 

 form, and is transmitted not by way of the salivary glands, 



Fig. 124. — Ornithodorus movibata. 



but by the bite becoming contaminated with the excreta of 

 the tick, at the moment of its infliction. (The Malpighian 



Fig. 125. — Larva of Ornithodorus moubata. 



tubules open into the rectum, and — as is the case with so 

 many other suctorial Arthropoda — the act of sucking is 

 accompanied by the expulsion of excreta.) 



