326 



or four rows of teeth. Scutum often with coloured 

 designs of specific importance. Stigmata usually 

 triangular. Eleven festoons in the male. 



(1) A. hebraeum. <? . Marginal festoons all green 

 except the two outside ones which are brown. Scu- 

 tum : sulphur colour marked with brown, the pattern 

 not in the form of an H or Y. Median posterior 

 linear- spot separate from the anterior spots. Marginal 

 groove extends to the posterior border. Legs brown 

 with white distal spots on segments 2, 3, 4, and 5. 



$ . Scutum as broad as long, triangular posterior 

 borders almost straight. On margin of scutum one or 

 two minute ' eye-spots,' i.e., a dark point surrounded 

 by a bright circle. Punctation scanty, thick on sides. 

 Shews metallic lustre. Eyes spherical, flat in anterior 

 quarter of scutum. Coxa I bicuspid. Coxa IV no 

 spine. S. Africa. 



Patbogenicity. Transmits ' heartwater ' in sheep, 

 the cause of which is unknown. 



Bionomics. The tortoise, variegated or bont tick. 

 Leaves its host for each moult. It is a very large 

 species, and the females will only bite if males are 

 already in situ. 



(2) A. americanum. The Lone Star tick ; on 

 cattle. 



GENUS HYALOMMA 



Eyes present. Rostrum long. Anal groove as in 

 Aponomma. Body elongate, oval, colour more or less 

 deep brown. 



$ . Very long palpi ; two pairs of ventral plates, 

 the inner triangular, the outer smaller and straight. 

 Stigmata comma-shaped with a long tail. Scutum 

 festooned posteriorly. Tarsi spurred. 



