on sand. The opportunities for dispersal of H. drome darii over 

 long camel routes may easily be imagined, but a large number of 

 ticks undoubtedly perish in either the egg or larval stage along 

 these wide and indefinite trails throiJgh barren deserts. Blanc, 

 Martin, and Bruneau (l%9) report females on camels that had ar- 

 rived, after a trek of longer than a week, across the Sahara, at 

 Gouliraine in southern Morocco from Mauritania, over a thousand 

 kilometers away. In Egypt, similar infestations are found in 

 the Cairo area on camels just arrived from the Sudan (these 

 also bear other Sudanese but not Egyptian species of ticks) 

 and in Siwa Oasis on camels from distant parts of Libya. 



In Egypt, tinfed adults may be taken on the desert of the 

 Mediterranean littoral at any time of the year. Unfed adults 

 either come rushing at any potential host, including man, from 

 under desert shrubs or- are collected in rodent burrows before 

 they depart in search of larger hosts. Engorged, ovipositing 

 females may be observed in rodent burrows as well as under des- 

 ert shrubs, in camel yards, and under stones. On the littoral 

 desert unfed adults are seen at any time of the day in all sea- 

 sons. 



REMARKS 



In attempts to determine whether larvae produce an acquired 

 immunity in the hosts, thus preventing subsequent larvae from 

 engorging on the same animal, Brumpt and Chabaud (1947) fed this 

 stage on rabbits with negative results. 



Differences in size of each stage and sex have been presented 

 by Campana-Rouget (195A-). 



A capillary tube arrangement, which has proved successful 

 for the artificial feeding of adults of H. drome darii for physio- 

 logical and disease-transmission studies" has been described by 

 Chabaud (195QA). 



Parasitic wasps (Hymenoptera ) , Hunterellus hookeri , have 

 been bred from nymphs of H. dromedarii (m H. as'iaticum j in Russia 

 by Bernadskaia (1939B). 



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