260 
Hominoxious A rth ropods 
ff. Integument with rounded tubercles or granules; body without stiff 
bristles.Omithodoros 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. 
lih. 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 
dd. With scutum or shield (fig. 50); festoons usually present; coxa? 
usually armed with spurs, tarsi generally with one or two ventral 
spurs; pulvilli present in the adults; sexual dimorphism pronounced 
. IXODIDiE 
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. II. chordeilis 
and leporis-palustris from the United States . 
. Hmmaphysalis Koch. 
