26o Hominoxious Arthropods 



it. Integumentwithrounded tubercles or granules; body without stifl 



bristles Omithodoros Koch. 



g. Two pairs of eyes; tarsi IV with a prominent subterminal 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 



andman O. turicata 



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

 O. moubata 





pAoam. 



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



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

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

 spurs ; pulvilli present in the adults ; sexual dimorphism pronounced 



IXODID.ffi; 



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, Tnexa- 

 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 



Hcemaphysalis Koch. 



