SPECIES OF RHIPICEPHALUS 599 



8. Marginal grooves long and deep, commencing near the eyes . . . . 9 

 Marginal grooves superficial, short, and commencing at about 



half the length of the body . . . :, . . . ziemanni. 



(Cameroons ; Liberia.) 



9. Scutum with sparsely scattered punctations absent in places . . . .10 

 Scutum with numerous and closely set punctations ...... . 13 



10. Scutum with unequal punctations, clearly marked and distri- 



buted irregularly .'.'. . . . . . . . . 11 



Scutum with large equal punctations, usually in longitudinal 



rows, intermixed with fine indistinct punctations . . . simus 



11. Coxa I either with no anterior projection, or only a short one, 



not visible on the dorsal surface . . . . . . . . .12 



Coxa I with a long anterior projection visible on the dorsal 



surface appendiculatus. 



12. Scutum with coarse and fine punctations regularly distributed, sanguineus 

 Scutum with medium-sized punctations equally distributed 



between the lateral grooves, sparse in their neighbourhood, 

 absent on the border ; some large ones in scapular angle . longus. 

 ....... . . (Congo ; Kasongo.) 



13. Scutum with punctations distributed throughout the whole 



surface . . , . . . 14 



Scutum with no punctations on either side in the depression 



between the cervical and marginal grooves .... super! ritus. 



(Congo ; Nyasaland.) 

 14.. Scutum .with markedly .unequal punctations, mostly fine and 



non-contiguous ......... bursa. 



Scutum with Jarge, sub-equal deep contiguous punctations, in 



lines often separated by ridges ...... capensis. 



15. Adanal plates pointed internally . . . . . . . 16 



Adanal plates with an external point ..... tricuspis. 



(Congo ; Transvaal.) 



16. Coxa I without a projection visible from the dorsum, adanal 



plates with two points ........ armatus. 



(Somaliland.) 

 Coxa I with a projection visible on the dorsum, adanal plates 



with one point . . . duttoni. 



" . . (Congo, Zambu.) 



17. Scutum with numerous white spots maculatus. 



(Cameroons.) 

 Scutum without spots, or with one diffuse spot in the centre . . . .18 



18. Adanal shields triangular, without a point, on the posterior 



. hump ' ... . . . . . . . .19 



Adanal shields quadrangular, with an internal point on the 



posterior hump cuspidatus. 



(Senegal.) 



19. Coxa I half the size of the adanal plate 20 



Coxa I as long as the adanal plate longicoxatus. 



(German East Africa.) 



20. Basis capituli as long as broad, with slightly. projecting lateral 



angles ecinctus. 



(British East Africa.) 

 Basis capituli broader than long with projecting lateral angles. V .. ' .;. '^ . 21 



