DERMACENTOR 



719 



Hosts —Man, cattle, horses, dogs, rabbits, ground squirrels, and 

 other squirrels. 



Distribution.- — Montana, Washington State, Colorado, and Idaho 

 Pathogenicity . — It is 



the carrier of the virus 

 of Rocky Mountain fever, 

 and also causes Tick 

 Paralysis. 



HaBmaphysalis Koch, 1844 

 {vide Figs. 316-319). 



RhipicephaliucE w i t h- 

 out eyes, with the base 

 of the capitulum rectan- 

 gular; twice as broad as 

 long. Palpi triangular or 

 crescentic. Stigmata 

 circular or comma- shaped. 

 Anal shields absent . Tegu- 

 ment brownish. Fig. 329. — Dermacentor salmoni Stil-ks, I gog: 



Type. — HcBfnapJiysalis Replete Female, Dorsal Aspect. 



concinna Koch, 1844. 



Species.— The most important species are: H. concinna, H. leachi, 

 H. flavii, H. punctata, the life-history of the last named having 

 been studied in detail by Nuttall, Cooper, and Robinson, while 

 according to Stockmann it trsinsmits Piroplasma ovis. 



Hsemaphysalis leachi 

 Audouin, 1827. 



Synonyms. — Ixodes 

 leachi Audouin, 1827 ; 

 Rhipistoma leachi C. L. 

 Koch, 1844; Rhipicepha- 

 lus ellipticum C. L. Koch, 

 1844; Rhipidosioma leachi 

 Karsch, 1878 ; Hcemaphy- 

 salis leachi Neumann, 

 1897. 



This species is found 

 in Africa, Sumatra, and 

 New South Wales. It is 

 the South African dog 



Fig. 330. — Derniacentov salnioni Stiles, 1909: tick. 



Replete Female, Ventral Aspect. The male is 3 by I '5 



millimetres, with yellow- 

 ish-red scutum, finely punctated dorsum, with eleven marginal 

 festoons. Palpi longer than hypostome. Coxae of all legs, with a 

 short spine. 



