325 



segment of palpi has a well-marked lateral conical 

 projection. Palp as a whole distinctly triangular or 

 crescentic. Stigmata circularor comma shaped an- 

 teriorly. Coxa I not cleft as in Eurbipicephalus. 

 Coxa IV not enlarged as in Eurbipicepbalus, but has 

 a well marked spur. 



(1) H. leacbi. Second segment of palp has a 

 sharp spine especially well marked in <? ; on the inner 

 side eight bristles ; third segment has a strong hook ; 

 fourth segment covered with numerous hairs. Hypo- 

 stome four or five rows of teeth. 



$ . Scutum yellowish red, punctations regular and 

 equal. Marginal furrow well marked. Venter white. 

 Hind angles of rostrum sharply pointed. Coxae have 

 short spines ; that on Coxa I the largest. 



? . Second palpal segment with sharp external 

 angle. Scutum oval. Punctations regular, cervical 

 grooves much prolonged posteriorly. Marginal grooves 

 absent. Porose areas separated by their diameter. 

 The South African dog tick. 



Pathogenicity. Transmits P. canis. 



Bionomics. It leaves its host for each moult. 



(2) H. flava. The common goat, sheep, and 

 buffalo tick of S. India. 



GENUS AMBLYOMMA 



3 . Eyes, generally flat, but not always conspicuous. 

 Anal grooves as in Afonomma. Anal plates absent, but 

 there are two pairs and one median chitinous platelet 

 near hind border (Donitz). Rostrum long, behind 

 almost rectangular, curving forwards to the narrower 

 anterior portion. Palpi long. First segment very 

 small, second long with four or five bristles, fourth in 

 a pit on the underside of the third. Hypostome, three 



