458 BUREAU OF ANIMAL INDUSTRY. 



Key to the Species of the Genus H^maphysalis. ^ 

 [For forms reported for the United States, follow Roman type.] 



Females 1 



Males 15 



A. — Female. 



1. Second palpal article angular or rounded laterally 2 



Second palpal article acute, spinescent (laterally) 12 



2. Palpi as broad as long, or broader than long 3 



Palpi longer than broad H. leporis-palustris. 



3. Scutum punctate 4 



Scutum not punctate H. rhinolophi. 



4. Coxae I piovided with a spine 5 



Coxx I without a spine (Tunis) H. erinacei. 



5. Tarsi IV less thanjcrar times as long as broad 6 



Tarsi IV at least four times as long as broad 10 



6. Scutum as broad as long or nearly so, and with sides convex 7 



Scutum much longer than broad; sides nearly straight (Brazil) . H. sanguinolenta. 



7. Second palpal article rounded laterally 8 



Second palpal article angular laterally 9 



8. Ventral aspect of uniform color (Europe, Asia, Africa) H. punctata. 



Ventral aspect whitish around vulva and anus (Brazil) H. dnnaberina. 



9. Third papal article with a ventral spine (Asia) H. flava. 



Third palpal article without ventral spine (New Guinea, Australia) H. papuana. 



10. Third palpal article without dorsal horn 11 



Third palpal article vnth dorsal retrograde horn (India) H. bispinosa. 



11. Tarsi I five times as long as broad H. concinna. 



Tarsi I three times as long as broad (Asia) H. hirudo. 



\2. A simple tuberosity on coxse IV 13 



A sharp spine on every coxa (Madagascar) H. elongata. 



13. Scutum much longer than broad (Africa) Leachi. 



Scutum scarcely or not longer than broad 14 



14. Second palpal article with retrograde prolongation (Asia) H. spinigera. 



Second palpal article without retrograde j^rolongation (Singapore, Borneo, 



Sumatra) H. cornigera. 



B.—Male. 



15. Third palpal articles not forming pincers together 16 



Third palpal articles prolonged toward median line and meeting to form 



pincers H- concinna. 



16. Coxse I provided with a spine 17 



Coxse I without spine erinacei. 



17. External angle of second palpal article without dorsal retrograde prolon- 



gation 18 



External angle of second palpal article tvith dorsal retrograde prolongation 24 



18. External angle of second palpal article without ventral retrograde prolon- 



gation 19 



External angle of second palpal article with ventral retrograde prolongation 



(Asia) H- spinigera. 



19. Spine of coxse I feeble or nil 20 



Spine of coxse I strong (Singapore, Borneo, Sumatra) H. cornigera. 



^This key does not contain the species Birmanise, histrids, cuscobia, Canestrinii^ 

 asiatica, and Gestroi. 



