TICKS OF THE BELGIAN CONGO. 



319 



Metastriata. 



With festoons, and with anal grooves contouring the anus behind, except in 

 Boophilus and Margaropus, wherein the festoons and anal grooves are absent. 



{a) BREVIROSTRATA. 



Group I. 



Genus 2. Haemaphysalis. 



Generic characters : Inornate, without eyes, festoons present, with usually short conical 

 palps whose second articles project laterally beyond the basis capitidi. With dorsal spur 

 on the first trochanter. Usually of small size. Sexual dimorphism slight, the male shows 

 no ventral plates or shields. Spiracles usually ovoid or short comma-shaped. 



Two species of Haemaphysalis are recorded from the Congo :■ — 



(1) H. leachi (Audouin, 1827) in which the palps protrude greatly at the sides in 

 the adult and immature stages (figs. 9 and 10). For the biology of this 

 species see p. 343. 



Fig. 9. Haemaphysalis leachi 

 (Audouin, 1827) <$ : dorsum, 

 capitulum in ventral aspect, 

 spiracle and tarsus iv. (NuttaU, 

 1913). 



Fig. 10. Haemaphysalis leachi (Audouin, 

 1827) $ : dorsum, part of venter, 

 spiracle and tarsus iv. (Nuttall 1913). 



