SPECIES OF IXODES 593 



19. Tarsi with dorsal hump near the extremity .... hexagonus. 

 Tarsi without dorsal hump . . . . . 20 



20. Scutum as broad or broader than long . 21 



Scutum longer than broad - . . . . ... -^. . , 22 



21. Scutum without lateral grooves, porose areas small, set widely 



apart . . . . . . . . . .., luteus. 



(Africa.) 



Scutum with lateral grooves, porose areas large, oval and near 

 each other .......... ovatus. 



(Japan.) 



22. Base of capitulum with ventral hump behind each palp .... 23 

 Base of capitulum without ventral hump ....... 28 



23. First segment of palp cylindrical without projections ..... 24 

 First segment of palp angular, forming a projection directed 



forwards ....... ... auritulus. 



(Tierra del Fuego.) 



24. Coxa I with large flat spurs of equal size .... loricatus 



(Brazil ; Argentine ; Paraguay ; Tierra del Fuego.) 

 Coxa I with unequal spurs .......... 25 



25. Scutum a little longer than broad . ..... . . . .26 



Scutum nearly twice as long as broad with numerous puncta- 



tions. minor. 



26. Scutum with cervical grooves and distinct punctations ..... 27 

 Scutum without cervical grooves, .punctations few and indis- 

 tinct . . nitens. 



(Christmas Island.) 



27. Scutum lozenge-shaped, broadest in middle .... frontalis. 



(France ; Italy ; England ; Germany ; United States.) 

 Scutum pyriform, broadest anteriorly ..... br untie us, 



(North America, Texas.) 



28. Porose areas large and sub-triangular, near each other . . angustus 



(Canada ; United States ; Argentine.) 

 Porose areas small, circular, and widely separated . . . granulatus. 



(Burma ; Java.) 



29. Coxa I with external spur 30 



Coxa I without spur 32 



30. Tarsi attenuated and indented eudyptidis. 



(New Zealand ; Japan.) 

 Tarsi gradually attenuated . ........ 3 1 



31. Porose areas large and close together : percavatus. 



(Nightingale Island.) 

 Porose areas fused together unicavatus. 



32. Tarsi with dorsal protuberance near the extremity 33 



Tarsi without dorsal protuberance . . . . . . . .35 



33. Scutum longer than broad ... ....... 34 



Scutum broader than long, sub-circular vestitus. 



(Australia.) 



34. Scutum lozenge-shaped, palps markedly hollowed out in- 



ternally . . . ...... . . . . hexagonus, sub- 

 species incho- 

 atus. 

 (France; England.) 



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