Key to Species 



139 



27. 



28. 



29. 



30. 



31. 



32. 



33. 

 34. 



35. 

 36. 



37. 



38. 

 39. 

 40. 



41. 



Cornua well marked, sharp 



„ faint or absent ..... 



(Porose areas large, near together (N. America) . 

 1 „ „ small, far apart (America) 



(Hypostome very long and pointed ; anus very 

 posterior (Italy) 

 Hypostome normal 



IPunctations on scutum large and few ; coxal spine 

 very long (Sumatra) 

 Punctations small and numerous 

 (Anal grooves short ; auriculae strong 

 I „ „ long ; no auriculae . 



(Porose areas transversely elongate (Madeira) 

 (possibly identical with ricinus) 

 Porose areas less elongate . 

 (Scutum nearly as broad as long . 

 ( ,, elongate, distinctly longer than broad 

 (Anal grooves pointed in front ; tarsi humped 

 \ „ „ rounded in front .... 



I Scutum oval; auriculae, but no cornua (America) 

 „ cordiform ; cornua, but no auriculae 

 (America) 



(Article 1 of palp with anteriorly directed spur (on 

 birds, Brazil) ....... 

 No such spur 



(Basis capituli winged, pointed laterally (S. 

 America) 

 Basis capituli normal ...... 



(Tarsus 4 humped, or narrowing abruptly 



( „ „ tapering more or le.ss gently 



(Anal grooves rounded in front .... 



\ „ „ pointed „„.... 



(Basis capituli elongate 



\ „ „ broader than long .... 



Slight sharp cornua, porose areas oval, longer than 



broad (Chili) 



No cornua, porose areas much broader than long 

 (N. Zealand) 



