Preface ix 



of /. signatus (type locality). Dr S. Hadwen, of Vancouver, British 

 Columbia, presented various stages of I. angustus (types of </ , O and 

 larvae). Dr J. H. Ashworth and Mr W. Evans, of Edinburgh, presented 

 us with our /. caledonicus (types of $, o and larva). Mr E. G. Wheler 

 presented a valuable collection, including some types of /. tenuirostris. 

 Numerous specimens have been sent to us by Mr C. P. Lounsbury, 

 Union Entomologist, S. Africa. Much material has reached us in 

 the form of collections sent for determination ; we may especially 

 cite the following sources : The Leland Stanford Junior University, 

 California (courtesy of Professor Vernon L. Kellogg) ; the Dublin Museum 

 (courtesy of Professor G. H. Carpenter and Dr Scharff ) ; the Entomo- 

 logical Research Committee for Tropical Africa (our thanks are due 

 to the Committee's Secretary, Mr Guy A. K. Marshall, for his uniform 

 courtesy) ; the Indian Museum, Calcutta (courtesy of Dr N. Annandale). 

 We have been permitted to retain specimens from these various 

 collections. 



We, are, moreover, personally indebted to numerous gentleman for 

 aid, as stated in the notes on the specimens in our collection appended 

 to the scientific descriptions. 



The original literature on various species of Ixodes, whilst very 

 extensive, is in nearly all instances quite useless to the systematist, 

 because many descriptions are short and vague and others, whilst very 

 lengthy, omit to mention the specific characters whereby the species can 

 be distinguished from others. We, of course, except the excellent descrip- 

 tions of Professor Neumann, from which we have obtained much help. 

 Almost all recent papers dealing with ticks are merely compilations 

 from Neumann. The publications of Donitz are a marked exception to 

 the rule. The papers by Banks have been of some assistance to us, 

 though we have too often found his descriptions imperfect, and his 

 illustrations greatly wanting in accuracy. 



G. H. F. N. 



C. W. 

 Cambridge, 

 May, 1911 



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