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hosts but the full extent of their importance as hosts remains to be studied. Nymphal preferences may differ from those of adults, although in some species this may not be true. Host size appears to be of some importance, for most larvae parasitize small animals; nymphs attack larger animals; and adults feed on the largest available animals, except carnivores. Immature stages, however, more frequently parasitize carnivores, Cattle and, to some extent, other domestic animals are important adult hosts and wild ante lopes are also frequently parasitized. The African tortoise, rhinoceros, elephant, and buffalo harbor species mostly restricted to themselves. In general, the domestic animal parasitizing species are well represented in study collections; others are seldom collected.
Amblyomma ticks are usually three host parasites and, so far as known in Africa, there is usually only a single generation an nually.
KEY TO SUDAN SPECIES OF AMBLYOLIMA
1. Lateral grooves extending anteriorly at
least to middle of scutum...
Lateral grooves absent
2. Eyes small, hemispherical, situated in
a well defined depression (i.e, orbited).....
4. Scutum with numerous coarse punctations,
and with a red lateral spot. (Rare in
.A. POMPOSUM Figures 80 and 81
Smaller than A. marmoreum group, maxi-
Figures 76 and 74
1. Eyes in a well-defined depression
(i.e. orbited), hemispherical or
Eyes not in a depression, flat or
some confluent; surface rugose poste
.A. POMPOSUM Figures 82 and 83
Scutum dark centrally, small pale spot
Figures 90 and 91
Scutum pale centrally, lateral fields
.A. COHAERENS Figures 66 and 67
*In the Sudan, exceptional specimens of A. marmoreum may have a scutal width of at least 1.3 greater than length (Figure 74), but in these, large punctations are scattered over the entire scutal surface.