Terminology 



131 



bearing hairs. The parts, scutum, capitulum, etc., on which punctations 

 occur are referred to as finely or coarsely punctate, etc. 

 Ornamentation refers to enamel-like coloration which may be present on the 

 scutum, capitulum and legs, etc. Ticks on which such ornamentation 

 occurs are spoken of as ornate ; for instance, Amblyomma and Dermaeentor 

 are usually ornate. 



«£*i 





/ i 3 ♦ J 



Fig. 137, illustrating the spiracles of 15 species of Ixodidae to show the different forms 

 they may assume. (Original, G. H. F. N. del.) 



All the figures are orientated so as to show their positions on the tick's body : A pointing 

 anteriorly, V and D ventrally and dorsally respectively. 



Spiracle 1. 

 2. 

 3. 

 4. 

 5. 



6. 

 7—15. 



7. 

 8. 

 9. 



10. 



11—15. 

 11. 

 12. 

 13. 

 14. 

 15. 



long axis of spiracle transverse 

 to body axis. 



long axis normal, i.e. 

 directed forward. 



Round as in J. ricinus $ . 



Bluntly oval as in I. boliviensis ? ) 



Elongate sub-oval as in I. tasmani $ ) 



,, oval as in I. angustus ; 

 Ovoid, flattened posteriorly (or sub-triangular) as 



in I. angustus s 



With slight postero-dorsal protrusion as in Haemaphysalis hystricis s . 

 With distinct darkly ehitinized marginal frame "complete" in 7, incom- 

 plete postero-dorsally in the remaining spiracles, which are comma- 

 shaped ; or (10) sub-triangular, with rounded angles. 

 Bluntly ovoid as in Boophilus annulatus ? . 

 Short comma-shaped as in Dermacentor variabilis ? . 

 „ „ „ Amblyomma longirostrum ? , with frame broad- 



ened dorsally. 

 Sub-triangular, with rounded angles and with frame broadening much 



dorsally as in A mbly omnia geoemydae ? . 

 More or less elongate comma-shaped spiracles : 

 As in Rhipicentor nuttalli i . 



„ Dermacentor reticulalus £ , and Rhipicentor bicornis s • 

 „ Rhipicejihalus sanguineus s , and Amblyomma versicolor i . 

 ,, Dermacentor andersoni 3 . 

 ,, Hyalomma aegyptium S , and Rhipicephalus sp. S . 



The "macula" is central in (1), eccentric in the others, being situated ventrally and 

 anteriorly, and possessing a variable form. 



