3i7 
Chapter XXVIII 
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 Rhipicephaleae. — (a) $ has two adanal 
I plates, often with accessory plates ; ( b ) anal groove 
I surrounds the anus behind and joins the genital grooves 
I in front; (c) eyes present; (d) rostrum long or short - 5 
SectionAmblyommeae. —( a ) cf 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 
3- inner surface in <1 (p. 318) - Euixodes (= Ixodes) 
I Palpi not grooved in S' - - - -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. 
