THE TICKS 151 



Life Histoeies 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. 



1 

 Larvae. — ^Bunched upon grass from which they reach 



I first host. 



First Molt, Larvae to Nymphs. — Upon ground, after drop- 

 I ping from first host. 



Nymphs.- — Crawl from grass upon second host. 



Second Molt, Nymphs to Adults. — Upon ground, after 



dropping from sec- 

 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 pubUshed 

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

 summarized as follows : 



