TICKS OF THE BELGIAN CONGO, 



351 



of trouble in the latter case. The optimum temperature for the development of ticks 

 received from tropical countries appears to be about 32° C, whereas ticks occurring 

 in temperate climates appear to undergo metamorphosis most rapidly at a temperature 

 approaching 20° C. It is well to determine which is the most suitable host upon which 

 to raise a species. Long-haired hosts are be^t. 



We wish to make it clear that to raise ticks successfully may at times be a matter of 

 great difficulty. It is naturally much easier to raise 1-host ticks than 2-host ticks, 

 and more difficult to raise 3-host ticks, because of the increased loss of life during 

 metamorphosis, especially under artificial conditions. 



It is clear that a sound knowledge of the life-history of the disease-bearing ticks is 

 essential in connection with the study of the diseases they convey and that such 

 knowledge is of great practical utility in the application of effective measures of 

 prevention. 



Index to Congo Ticks and their Hosts. 



Amblyomma cohaerens, Donitz 1909 

 * „ hebmeum, Koch 1844 



„ marmoreum, Koch 1844 . . 



„ pomposum, Donitz 1909 . . 



„ splendidum, Giebel 1877 . . 



„ thoUoni, Neumann 1899 . . 



„ trimaculatum, Neumann 1908 



„ variegatum (Fabricius 1794) 



Aponomma exornatum, Koch 1844 



,, laeve, Neumann 1899 



"^Boophilus decoloratus (Koch 1844) 

 Dermacentor circumguttatiis, Neumann 1897 



„ rhinocerotis (de Geer 1778) 



^Haemaphysalis leachi (Audouin 1827) . . 



„ parmata, Neumann 1905 



%Hyalomma aegyptium (Linnaeus 1746) 

 Ixodes rasiis, Neumann 1899 



„ ruhicundus var. limbatus, Neumann 1908 

 *Ornithodorus moithata (Murray 1877) . . 

 Rhipicentor bicornis, Nuttall and Warburton 

 1908 



Hosts. "f Page. 



cattle, buffalo . . . . 337 



cattle, sheep, goat, antelope 337, 347 

 rhinoceros, Genetta, Chelonia, 



python 

 cattle, mule, antelope 

 cattle, buffalo 

 elephant, horse, antelope 

 lizards 



cattle, sheep, rhinoceros 

 reptiles 

 reptiles 



cattle, sheep, goat . . 

 elephant 

 rhinoceros 

 Carnivora, cattle, 



goat, horse 

 cattle, goat, sheep 



antelope, dog, 



choerus 



.. 338 

 .. 338 

 .. 336 

 .. 338 

 .. 338 

 336, 347 

 . . 339 

 . . 339 

 333, 345 

 . . 321 

 . . 321 

 sheep, 



319,343 

 buffalo, 

 Potamo- 



. . 320 



cattle, sheep, etc., dog 335, 346 

 cattle, dog, leopard, Hyrax 318 

 sheep, goat . . . . . . 318 



:. 315 



man 



horse, goat 



322 



For Notes see end of Index. 



