in addition to three previously described species, remained mostly 

 vtnrecognized by subsequent workers. The genus was reduced to four 

 species, including a single new one, and four subspecies by Neu- 

 mann (1911). H. ae gvptium was used as a '"catchaU" name by most 

 persons until The 19*^0' s. During the early twentieth century, 

 British workers in Africa, depending on Nuttall and Warbvirton 

 at Cambridge for identification of their collections, developed 

 a group of names that are herein referred to those in contemporary 

 usage after having studied the Nuttall collection in British 

 Museum (Natural History). 



Between 1919 and 1950, Schulze and a few of his students 

 and followers seized upon the apparently imlimited opportimities 

 for providing dozens of species names for variants in this genus. 

 Scarcely a single one of the some eighty species and subspecies 

 proposed by Schulze and colleagues has withstood the test of 

 comparison with reared progeny from a single female tick. After 

 having studied parts of Schulze* s collection, now housed in Roclsy 

 Mountfiiin Laboratory, one can ujider stand, from the small series 

 and poor labelling, how misconceptions regarding species identity 

 developed among persons eager to tag each variation with a spe- 

 cies name. Schulze even went so far as to name the progeny of 

 a single fe m ale as different species (H. delpyi Schulze and 

 Gossel,1936) (Delpy 19^6a). 



RECENT REVISIONAL AND STJPPCRTING STUDIES 



During the last twenty years a certain araoxint of cosmos has 

 begun to evolve from this nomenclatorial chaos, although it is 

 obvious that additional modifications in species concepts and 

 names are yet to come. The careful, tedioios, and time-consuming 

 pioneer work of Delpy, who secured specimens from many areas 

 where hyalommas occtir and reared the progeny from single fe- 

 males, enabled him to determine the range of variation within 

 a single species and to show that characters proposed for many 

 so-called species were due merely to multiformity of appearance 

 within a few species. In a few instances, however, Delpy in- 

 cluded species that we now know to be distinct genetic entities 

 worthy of species rank. 



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