319 



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. 



(i) Evi ricinus ( reduvius). The castor-bean 

 tick. $ . Sides of anal shield divergent (i.e., the anal 

 shield is ' open '). Scutum covered with very fine 

 hairs (pubescence), covers the greater part of back, 

 and is not fringed with hairs behind. Coxa I with a 

 strong spine internally only. Tarsi not knobbed. 

 Ventrally, the rostrum has a little knob just behind the 

 base of the palp. 



? . Anal grooves prolonged behind the anus, 

 divergent. First segment of palpi short, not forming 

 a horn directed forwards. Scutum longer than broad, 

 with rounded or angular sides (not concave), has 

 cervical and lateral furrows. Coxa I unicuspid, tarsi 

 not knobbed. This tick is common on sheep, goats, 

 and cattle, Europe. 



Pathogenicity. Transmits P. bigeminum. 



It is probable that Evi ricinus takes infection (P. 

 bigeminum) in adult stage and gives in larval and 

 nymphal stage. 



Bionomics : 



1. Egg laying- 100-1,000 eggs laid Time 1-2 weeks 



Incubation - 6 



2. Larva - (a) On animals - I 



(b) On the earth. At 

 the end of this period 

 the first moult takes 

 place and then results ,, 4 ,, 



