ization of the exoskeleton and gut and of the musculatiire of this 

 species have been discussed by Ruser (1933). A. variegatu-n has 

 been used to illustrate the double oblique- stri at ion of tick 

 musciilature by Kruger (1935). Variations in scutal orna-nentation 

 among specimens from a restricted area were illustrated by Ten- 

 deiro (194-9B,1951F) • The eye structure and related sense organs 

 were described and illustrated by Gossel (1935) . 



DISEASE RELATIONS 



MAN and MD4ALS: Q fever (Coxiella burnetii ) . Larvae and 

 nymphs commonly attack man under local conditions and may cause 

 severe irritation. 



CATTLE ; Heartwater (Rickettsia ruminantium ). Bovine lymphan- 

 gitis, large septic sores, and severe inflgtrnmation of mammae. 

 Possibly transmits a fungus, Cryptococcus (= Actynomyces ) farci- 

 minosus . 



A. variegatum has been mentioned in connection with bovine 

 rickettsiosis (Rickettsia bovis ), but the tick's role does not 

 appear to have been defined. This tick does not transmit East 

 Coast fever (Theileria parva ). 



SIEEF ; Nairobi sheep disease (virus). Heartwater (R. 

 ruminantium ) . 



GOATS ; Heartwater (R. ruminantium ) . Severe secondary in- 

 fection and lameness. 



PIGS ; Possibly a vector of porcine piroplasmosis ( Babesia 

 trautmanni ) . 



UILD Aim-IAL INJURY ; In the Sudan I removed a live nymph 

 from a thigh abscess that was almost completely overgrown by the 

 skin of the jackal host. 



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