THE ARGATINI 



579 



Neumann, whose opinion naturally carries great weight, places ticks in 

 the family Ixodidae, which he divides into two subfamilies as noted above. 

 The subfamily Ixodinae is distinguished from the subfamily Spelaeo- 

 rhynchinae by the presence in the former of a well developed hypostome, 

 which is armed with rows of recurved teeth ; in the latter the maxillae 

 are reduced to two small membraneous laminae, and the hypostome 

 is styliform and without teeth. He sub-divides the Ixodinae into 

 two sections, the Ixodini and the Argatini, and classifies the former as 

 follows : 



IXODINI 



IXODES 



CERATIXODES 

 ESCHATOCEPHALUS 



TRIBE 2 TRIBE 3 



I * I 



RHIPICEPHALARIA AMBLYOMMATARIA 



AMBLYOMMA 

 DERMACENTOR 

 APONOMMA 

 HJEMAPHYSALIS 



Neumann retains the genera Ceratixodes and Eschatocephalus. His 

 genus Margaropus includes Boophihts, Curtice, and Margaropus, Karsch. 

 He does not recognize the genus Rhipicentor, Nuttall and Warburton, and 

 places the type species, Rhipicentor bicornis under Rhlpicephalus gladiger, 

 Neumann. The genus Hyalomma is placed along with Rhipicephalus and 

 Margaropus, whereas Warburton keeps it in a group to itself ; Banks 

 places it along with Amblyomma and Aponomma. 



In dealing with the genera and species Neumann's classification is 

 adopted here ; the keys and most of the descriptions are taken from his 

 recent work on ticks, Ixodidae, in Das Tierreich. Part 26, 1911. 



SECTION ARGATINI 



Ticks without a scutum, the integument being leathery and covered 

 with mammillae. Capitulum ventral in the nymphal and adult stages. 

 Palps free and leg-like, the articles cylindrical. Spiracles usually small, 

 and situated in front of coxa IV. Coxae contiguous or sub-contiguous. 

 Tarsi with rudimentary or no pulvilli ; sexual dimorphism slight. 

 (Neumann) 



