260 Hominoxious Arthropods 



ff. Integument with rounded tubercles or granules; body without stiff 



bristles Ornithodoros Koch. 



g. Two pairs of eyes; tarsi IV with a prominent sub terminal spur 

 above; leg I strongly roughened. On cattle and man. 



O. coriaceus 



gg. No eyes; no such spur on the hind tarsi. 



h. Tarsi I without humps above O. talaje. 



hh. Tarsi I with humps above. 



i. Tarsi IV without distinct humps above. On hogs, cattle 



and man O. turicata 



ii. Tarsi IV with humps nearly equidistant (fig. 142). Africa. 



. .O. moubata 



149. Haemaphysalis wellingtoni. Note short palpi. After Nuttall and Warburton. 



dd. With scutum or shield (fig. 50); festoons usually present; coxae 

 usually armed with spurs, tarsi generally with one or two ventral 

 spurs ; pulvilli present in the adults ; sexual dimorphism pronounced 



IXODIDyE 



e. With anal grooves surrounding anus in front ; inornate; without eyes; 

 no posterior marginal festoons; venter of the male with non- 

 salient plates. Numerous species, 14 from the United States, 

 among them I. ricinus (fig. 49 and 50), scapularis, cookei, hexa- 

 gonus, bicornis. Ixodes Latr. (including Ceratixodes). 



ee. With anal groove contouring anus behind, or groove faint or obsolete. 

 f. With short palpi (fig. 149). 



g. Without eyes, inornate, with posterior marginal festoons; male 

 without ventral plates. Numerous species. H. chordeilis 



and leporis-palustris from the United States 



H&maphysalis Koch. 



