146 



SCOKPID.NK, Sl'IDEKS, AND TICKS 



in the fields wlicre the "seed" ticks are, fii.sten themselves 

 to their liost, and li\'e there until mature. 



The most conmion tick in tlie northei'n states is the dog 

 tick. It derives its name from the fact that it is most 

 connnonly found on dogs, althougli it often infests other 



Fig. S4. — SoiitiiL-rii cattle ti 



ilar*rL'(l; B, natural si/.e. 



animals. When fully matured, the female is about one 

 half inch long. Tlie back of this tick is marked with bright 

 silv(;ry lines and l)lotclics. Tlie ytjinig are found on the 

 leaves of weeds and bushes, whence they gain access to the 

 bodies of passing animals. 



Spiders. — In general, spiders have acquired an unsavory 



