318 

 Prostriata. 



GEORGE H. F. NUTTALL. 



Genus 1. Ixodes. 



Generic characters : Anal grooves surrounding the anus in front, scutum without 

 coloured design {inornate), eyes and festoons absent, spiracles round or oval. Sexual 

 dimorphism pronounced in respect to the capitulum. Males with ventral surface of the 

 body covered by hard non-salient plates. 



Fig. 7. Ixodes rasus, Neumann, 1899, ^ : ventral 



aspect ; digit and hypostome highly magnified 



(Neumann, 1899). 



This genus is poorly represented in Africa, and but two species have hitherto been 

 recorded from the Congo : (1) Ixodes rasus, Neumann 1899, is unique among African 

 Ixodes in possessing a small perfectly circular anal groove (figs. 7 and 8). (2) Ixodes 

 rubicundus var. limbatus, Neumann 1908, cJ unknown, the 5 somewhat resembles 

 I. ricinus (fig. 6) but the palps are longer and concave externally and coxae i., ii. and 

 lii. bear no spurs. Recorded once from Katanga. 



Fig. 8. Ixodes rasuSy Neumann, 1899, $ : dorsum, part of venter, 

 spiracle and tarsus iv. (Nuttall, 1911). 



