.346 



Genus Boophilus 

 Not admitted by Neumann as a genus. 



Genus Haemaphysalis 



Eyes wanting. Base of rostrum rectangular, 

 twice as long as broad, palpi conical. Second 

 segment of palpi has a well-marked lateral 

 conical projection. Stigmata comma-shaped or 

 circular. Anal shields absent in male. Coxa i 

 not bifid. Coxa iv in male, a well-marked 

 spur. There are about twenty-six species. 



H. leachi (South Africa). — The dog is the 

 usual host. Possibly transmits Pivoplasma cams, 

 occurs also on cattle. 



Labium. — Four rows of teeth in 9 , five rows 

 in $ . 



Palpi. — Dorsal surface as broad as long. 

 Second palpal segment has a sharp lateral spine. 



Coxa iv. — Has a tuberosity. 



Genus Derimacentor 



Eyes present. Base of rostrum broader than 

 long. Palpi short and thick. Stigmata, comma- 

 shaped. Anal shields absent in male. Coxa i 

 bidentate in $ and ? . Scutum ornamented. 

 About twenty-four species. 



D. Electus is the American dog tick. 



The subfamily Ixodinae consists of five 

 genera, Ixodes, Haemalastor, Aponomma, Ambly- 

 omma and Hyalomma. 



