Chapter XXFIII 



The Ixodidae are classified in the following 

 way* : 



Sub-family Ixodinae. (a) Scutum present ; (b) 

 pulvilli present on claws ; (c) the mouth parts project 

 and are seen in front ; (d) stigmata behind Coxa IV - 2 



Sub-family Argasinae. (a) Scutum absent ; (b) 

 pulvilli absent on claws of adults ; (c) mouth parts 

 hidden on the under surface of body, so that they are 

 not seen from above ; (d) stigmata between Coxae III 

 and IV - 9 



Section Ixodeae. (a) $ has ventral side of body 

 covered with shields or plates ; (b) anal groove sur- 

 rounds the anus in front and is not connected with 

 the genital grooves ; (c) eyes absent ; (d) rostrum 

 long - - 3 



Section Rbipicepbaleae. (a) 3 has two adanal 

 plates, often with accessory plates ; (b) anal groove 

 surrounds the anus behind and joins the genital grooves 

 in front ; (c) eyes present ; (d) rostrum long or short - 5 



Section Amblyommeae. (a) 3 ventral plates absent; 

 (b) anal groove surrounds the anus behind and joins the 

 genital grooves in front ; (c) eyes often present ; (d) 

 rostrum long or short 7 



[ Second and third segments of palpi grooved on 



J inner surface in J (p. 318) Euixodes (= Ixodes) 



( Palpi not grooved in $ - 4 



* The method of using this and similar tables is as follows, (i) Determine if 

 a tick has or has not certain characters contrasted in group i. If the tick has, e.g., 

 pulvilli then proceed to group 2, if not, to group 9. If it is in group 2 then 

 determine again whether or no it has various characters, e.g., if it has no eyes 

 proceed to group 3, if it has eyes to 5 or 7, and so on, until the genus is reached. 



