1. Scutum ornate. Mottled ornate scutum or Ornate scutum with dots .......... Go to: 3 & 4
2. Scutum not ornate. .......... Go to: 5 & 6

3. Long thin palpi .......... Amblyomma sp.
4. Short thick palpi .......... Dermacentor sp.

5. Anal groove anterior to anus. ........ Ixodes sp.
6. Anal groove posterior to anus. .......... Go to: 7 & 8

7. Festoons absent. Palpi very short, with small ridges. .......... Boophilus sp.
8. Festoons present. .......... Go to: 9 & 10

9. Second palpal segment with lateral projection. Basis capitulum withOUT lateral points. .......... Haemaphysalis sp.
10. Second palpal segment withOUT lateral projection. Basis capitulum with lateral points. .......... Rhipicephalus sp.