5. Lateral grooves reaching scutal mid

length; scutum largely covered by
small and medium-size punctations.
(Medium-size; Near East; North, West,
and coastal East Africa).

.H. IMPELTATUM Figures 170 and 111

Lateral grooves confined to posterior
third of scutum; scutum smooth with
few, scattered, usually large puncta
tions; posterior grooves characteris
tically marked. (Large ticks of camels
wherever these animals now or recently
occurred).

.H. DROMIDARII Figures 162 and 163

6. Lateral grooves confined to posterior

third of scutum; scutum almost im
punctate except in caudal depressed
area. (Usually small ticks; Mediter.
ranean Basin, Near and Middle East;
East African coastal areas and northern
Sudan)....

.H. EXCAVATUM Figures 160 and 167

Lateral grooves reaching at least scutal
midlength (if specimen is heavily punc-
tate, grooves may be obscure).....

7

7. Scutum smooth, shiny with rare, scattered

large punctations; lateral grooves long
and usually very distinct; posterior
grooves well marked; legs usually not
ringed.

..H. DETRITUM* Figures 160 and 161

*A closely related "form" of uncertain taxonomic status, "H. scupense", with some biological and morphological characters differing from those of typical H. marginatum, occurs in parts of the Soviet Union and southeastern Europe.

*Exceptional specimens of H. turanicum may lack this aspect. Others of H. marginatum and H. impeltatum may approach this aspect.