THE TICKS 151 



Life Histories of the Dog Tick and Texas-Fever Tick Compared 

 IN Tabular Review (note italics) 



dermacentor variabilis 

 Ovigerous Female. — Engorges upon host, drops to ground, 

 I and deposits eggs. 



Eggs. — Deposited upon ground in mass. 



I 

 Larvae. — Bunched upon grass from which the}^ reach 



I first host. 



First Molt, Larvae to Nymphs. — ?7joon ground, after drop- 



I ping from first host. 



Nymphs. — Crawl from grass upon second host. 



Second Molt, Nymphs to Adults.— ?7?j0/i ground, after 

 I dropping from sec- 



I ond host. 



Males and Females.— C rawl from grass upon third host; 

 I mate. 



Ovigerous Females. — Engorge upon host. 



Ovigerous Females. — Drop to ground and deposit 

 eggs. 



MARGAROPUS ANNULATUS 



Ovigerous Female.— Engorges upon host, drops to ground. 

 I and deposits eggs. 



Eggs. — Deposited upon ground in mass. 



Larvae. — Bunched upon grass from which they reach 

 I host. 



First Molt, Larvae to Nymphs. — Upon host. 



Second Molt, Nymphs to Adults. 

 Males and Females. — Upon host; mate. 



Ovigerous Females. — Engorge upon host, 



Ovigerous Females. — Drop to ground and deposit 

 eggs. 



Loss Occasioned by Cattle Ticks.— According to estimates published 

 in 1914, the main sources of loss occasioned by the cattle tick may be 

 summarized as follows: 



