321 



GENUS EURHIPICEPHALUS 



(= Rhipicephalus in part). Eyes present. Base 

 of rostrum when looked at from above hexagonal 

 forming an angle on each side. Differ from genus 

 Margaropus in the following points : 



(1) Stigmata comma shaped in $ , shorter in ? . 



(2) Eleven marginal festoons. 



(3) Anal groove present in ? . 



(4) First segment of palp bears on the ventral 



inner surface a plate which may be pro- 

 longed into a hook or spine and which bears 

 five to seven feather bristles (cp. Mar- 

 gar 'Opus). 



(5) Coxa I deeply incised, producing two long 

 cusps. 



$ . A single pair of anal plates, the accessory pair 

 only slightly developed; in Mar gar opus, they form a 

 second pair. 



? . Stigmata round. Scutum, polygonal, posteri- 

 orly; not triangular as in Margaropus. 



Bionomics. Eu. evertsi changes its host between 

 the nymphal and adult stage, while Eu. appendiculatus, 

 the 'brown tick' and Eu. simus, the 'black-pitted tick,' 

 change their host after the larval and nymphal stage. 



(i) Eu. appendiculatus. <? .' Palpi flat dorsally, 

 with convex margins. Tooth on first segment well 

 developed. Scutum uniform in colour. Marginal 

 furrows single. The posterior accessory furrows join 

 the festoons. Eyes flat, scutum with numerous, 

 unequal, chiefly fine, generally regularly scattered 

 punctations. ' Tail ' twice as long as broad (only 

 visible when the male has fed for some days). Coxa I 

 with a long anterior prolongation visible from the 

 dor sum (cp. Eu. sanguineus). 



