347 



Genus Ixodes 



Eyes absent. Palpi long. Tarsi without 

 terminal spurs. Anal groove surrounds anus 

 anteriorly and opens posteriorly. Scutum in 

 male does not cover the body laterally and 

 posteriorly. Stigmata oval in $ , circular in ? . 

 Male ventrally covered with six shields ; two 

 lateral, embracing the origins of the legs and 

 the stigmata ; one median, between the genital 

 opening and the anus ; two on each side of 

 the anus (perianal) ; and one triangular posterior 

 shield, carrying the anal orifice at its anterior 

 corner. Female has dorsally three longitudinal 

 grooves on the abdomen, ventrally two bell- 

 shaped grooves, the first has its apex at the 

 vulva, the second at the anus. There are a 

 large number of species. 



1. /. ricinus. — The castor-bean tick is com- 

 mon on sheep, goats, cattle : Europe. 



2. /. hexagonus. — The European dog tick. 



Genus Haemalastor 



Eyes wanting. Rostrum long. Palpi piri- 

 form S , claviform ? . Anal grooves as in Ixodes. 

 Stigmata circular in both sexes. Legs very long. 

 ■ Dorsal and ventral chitinous thickenings in the 

 male ; fine grooves in the female. There are 

 seven species. 



Genus Aponomma 



Eyes wanting. Anal groove surrounds anus 

 posteriorly, and opens anteriorly. Anal plates 

 absent. Base of rostrum pentagonal. Scutum 



