I20 Veterinary Medicine. 



strong conical lateral basal projection. Stigmal plate circular or 

 in short comma. Anal shields of male absent. Coxse I not bifid ; 

 coxae IV of normal dimensions in male. 



KEY TO SPECIES OF GENUS H^MAPHYSALIS. 



Palpi longer than broad in male especially. United States. 



H. Leporis Palustris. 

 Scutum not punctate. H. Rhinolophi. 



Coxae I without a spine. Tunis. H. Erinacei. 



Scutum much longer than broad, sides nearly straight. Brazil. 



//. Sanguinolenta. 

 Ventral aspect of uniform color. Outer angle of 2d palpal 

 article rounded in male. Europe, Asia, Africa. H. Punctata. 

 Ventral aspect whitish around vulva and anus. Brazil. 



H. Cinnaberina. 



Third palpal article with a ventral spine. In male cervical 



furrows very deep. Asia. H. Flava. 



Third palpal article without ventral spine, in male and female. 



New Guinea, Australia. H. Papuana. 



Third palpal article with dorsal retrogade horn. India. 



H. Bispinosa. 



Tarsi I five times as long as broad. In male 3d palpal articles 



unite to form pincers. H. Concinna. 



Tarsi I three times as long as broad. H. Hirudo 



A sharp spine on every coxa. Palpi longer than broad in 



male. Madagascar. H. Elongata. 



Scutum much longer than" broad. Palpa in male as broad as 



long. Africa. H. Leachi. 



Second palpal article with retrograde prolongation : male and 



female. Asia. H. Spinigera. 



Second palpal article without retrograde prolongation. Male 



has strong spine on coxae I. Singapore, Borneo, Sumatra. 



H. Cornigera. 

 Genus Dermacentor. 



Eyes present. Base of capitulum rectangular, broader than 

 long. Dorso-submedian porous plates present. Palpi short and 

 thick. Stigmal plate comma-shaped : short. Male without anal 

 shields. Coxae I bidentate in both sexes : Coxae IV of male 

 much longer than I and III. Scutum usually ornamented. 



