1 1 8 Veterinary Medicine. 



Genus Rhipicephalus. — Eyes distinct, base of capitulum 

 broader than long, hexagonal on dorsal surface, forming at each 

 side a projecting angle. Palpi short, broad ; third article pro- 

 longed on its dorsal aspect by a short, retrograde point ; first 

 article by an internal median lobe, occasionally not distinct, and 

 slightly retrograde. Coxse I with two generally large teeth. 

 Stigmata in the form of a comma, with short tail in female, long 

 tail in male. 



Male with two pairs of anal shields (clypei): (i) one pair of 

 large adanal shields, one on each side of the anus, triangular or 

 occasionally rectangular ; (2) one pair of smaller shields external 

 to these. 



Female. Male. Distribution Species. 



Scutum white Scutum black and 



white Zanzibar R. Pulchellus 



Abdomen with white 



lines and points Zanzibar R. Perpulcher 



Scutum slightly emar- 



ginate in front Zanzibar R. Brevicollis 



Scutum with unequal Punctations distribu- Europe, Asia 



(largeand small) tedregularly Africa, Aus- 



punctations tralia, Phil- 



ippines, CI. 



America R. Sanguineus 



Punctations few, lin- Punctations in young 



early arranged not near margin Sumatra R. Paulopunc- 



Punctations numer- Punctations distribu- tatus 



ous ted irregularly Africa R. Punctatissi- 



Anal valve bordered inus 



with white Egypt R. Rutilus 



Scutum smooth on the Postero - marginal f es- 

 margins toons with white bor- 

 der So. Africa.. R. Capensis 



Scutum rough on en- Postero - marginal fes- 

 tire surface; eyes toons of uniform color 



dark So. Africa.. R. Evertsi 



Scutum elongate, sides Palpi short, thick, an- 

 convergeut back of gular, 2d and 3d seg- 



eyes ments or articles 



drawn out laterally UnitedStates 



into sharp point South R. Aunulatus 



Scutum oval, sides not (Boophilus 



convergent back of Pale brown, transpar- Bovis) 



eyes, young yellow.. ent So. Africa.. K. Decolora— 



tus (Blue 

 Tick) (Boo- 

 Punctations equal, Punctations fine, cov- Europe, Af- philus Becol 



close together ering entire surface.. rica, West oratus) 



Indies R. Bursa 



Scutum ( of young ) cov- 

 Punctations unequal, ers entire dorsal sur- 

 separated face Africa R. Simus 



