SPECIES OF IXODES 591 



Neumann gives the following key to the identification of the species : 

 NEUMANN'S KEY TO THE SPECIES OF IXODES 



MALES 



1 . Palps hollowed out on their internal surfaces ........ 2 



Palps convex on their internal surfaces . . . . . . . .14 



2. Anal grooves parallel or divergent ......... 3 



Anal grooves convergent . . . . . . . . . . . 11 



3. Scutum covering almost the whole of the dorsum ...... 4 



Scutum covering the middle half of the dorsum . . . loricat us. 



(Brazil ; Argentine ; Paraguay.) 



4. Coxa I spurred ............ 5 



Coxa I without spurs ........... 10 



"). Tarsi without dorsal humps .......... 6 



Tarsi with sub-terminal dorsal hump ........ 9 



6. Coxa I either without external spur or with an external one 



shorter than the internal 7 



Coxa I with two short equal spurs ...... coxaefurcatus 



(Egypt.) 



7. Coxa I has a very long internal spur ........ 8 



Coxa I has a short internal spur, double the length of external, minor. 



(Guatemala.) 



8. Coxa I without external spur ricinus 



(Europe; United States; Caucasus; Asia Minor; Japan; China; Algeria.) 

 Coxa I has a well developed external spur .... holiviensis 



(Bolivia.) 



9. Coxa I has a very long internal spur ..... cooker 



(United States, Texas, Massachusetts.) 

 Coxa I has a short internal spur ...... hexagonus. 



(England; France; United States.) 



10. Anal plate has parallel sides ....... rubicundus. 



(Cape Colony ; Congo.) 

 Anal plate broader posteriorly than anteriorly .... tenuirostris. 



(Great Britain ; Germany.) 



11. Anal plate open posteriorly ......... 12 



Anal plate circular ......... rasus. 



(Africa, Congo, Togo Land, Cameroons.) 



12. Anal plate in the shape of a horse-shoe ..... pilosus. 



(S. Africa.) 

 Anal plate terminating in a point posteriorly . . . . . . . 13 



13. Anal plate sub-circular (racket-shaped) ..... Ugandanus. 



(Uganda.) 

 Anal plate sub-rectangular . . . . . . . holocyclus. 



(Australia.) 



14. Third segment of palp terminating in a point, legs of medium 



length (Ceratixodes) putus. 



Third segment of palp thickened at summit, legs very long 



(Eschatocephalus) . . . -; . . " . . . vespertilionis. 



