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Amblyomma cohaerens, A. lepidum, A. marmoreum (group)867

Amblyomma nuttalli, A. pomposum, A. rhinocerotis.....868

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Hyalomma sp. no. 1 near excavatum.

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...878 .881

Hyalomma sp. no. 2 near excavatum.
Hyalomma marginatum..

......885

.887

..889

..890

.890

Rhipicephalus compositus, R. cuspidatus.

Rhipicephalus pravus, R. s. sanguineus

Rhipicephalus s. simus, R. s. senegalensis.

Rhipicephalus supertritus, R. tricuspis...

892

..895

.896

899

..906

.908

908

Rhipicephalus e. evertsi, R. longus, R. mühlensi

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BIBLIOGRAPHY.

912

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MAPS AND ILLUSTRATIONS

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Subdivisions of Ethiopian Faunal Region...... 22
Political Divisions of Africa.

24

2228

The Sudan. Principal Collecting Sites....... 25
Ixodidae. Key Morphological Characters..

ARGASIDAE

38

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Peripheral and Lateral Differences..

54

57

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A. (Argas) persicus and A. (Argas) reflexus.. 58
A. (Ogadenus) brumpti..

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A. (Chiropterargas) boueti

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81

.. 90

97

..103

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9 Sagittal Views, Unengorged and Engorging...158 Capitulum. Vertical Section..

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....119

...120

....135

.138

...140

....157

..163

..164

...175

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**The o of H. schulzei is illustrated in PLATE

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