40 



Genus Ornithodoros 



adult. Discs 1 present or absent ; but when present, not arranged radially. 

 Certain fairly constant grooves and folds on the venter, namely a coxal 

 fold internal to the coxae, a supra-coxal fold external to the coxae, a 



TARSI I AND IV OF SPECIES OF ORNITHODOROS 

 Tarsus I. Tarsus IV. 



turicata 



talaje 



T 



talaje 



lahorensis 



3T 



Lakorerisis 



megruru 



^u 



meg mm 



V 



jD 



fumaai furcosus 



Fig. 58. Original, N. and W. 



' Structures analogous to the " discs " of Argas are probably to be found in all species 

 of Ornithodoros under sufficient magnification, but in some species they are not visible as 

 such to the naked eye, or by the aid of a simple lens. In such cases the species is said in 

 the subsequent diagnoses to be without obvious discs. 



