STORY OF CATTLE-FEVER TICK 



t'ilttlp-fever tlckH nftpr rtrst 

 luolt. Count the leK8 



The little ei<zht-le«r«red ticks sucked blood a^Miii :ind kept on ^row- 

 in<r until they (•linn<red or molted a second tinu'. Aftei- the >econd 

 molt thev looked like this: 



Female, or eKg-layliiR, cattlo-fover 

 tick after second molt 



1 



Male cattte-fever tick 

 aftiM .•.ecoiid molt 



D 



After this second (•han<^'e some of the ticks had hecoiue hrown male 

 ticks. The others had hecome e<r<;dayin«: ticks. The e«i:^'da^vin^' ticks 

 at lir.st were not much larp-r than the hiown mule ticks. '1 he l)n»\vn 

 male ticks did not <:ro\v any more. I'ut the e<r<:dayin}Z ticks <:rew 

 lar<j:er and lar^rer, and the lar^'er they <;re\v the more blood they 

 sucked from the cow. 



