TICKS OF THE BELGIAN CONGO. 



337 



<3) 



(i) 



A. cohaerens, Donitz, 1909. We have not as yet seen this tick in a living 

 condition. In dried and in alcohol specimens it closely resembles A. splen- 

 didum in colour and scutal markings. The only observable difference 

 consists in the absence of the orange spot. The species also appears to be 

 common. It would be of interest to determine the geographical distribution 

 of splendidum and cohaerens, as the slight difference points to their being 

 merely varieties of one species. 



Pig. 40. Amhlyomma rariegatum 

 (Fabricius, 1794), (^ : dorsum 

 (from drawing by J. Marx, published 

 by Neumann, 1899). 



Fig. 41. Amhlyomma 



splendidum Giebel 1877, 



o : dorsum (Original, 



G.H.F.N.), 



A. hebraeiini, Kocb, 1844. The festoons are whitish, the tw^o spots at the sides 

 yellowish, the greater part of the light areas are pale violet or pinkish and 

 the dark parts are black (fig. 43). When the tick dies and is allowed to dry, 

 the light areas turn pale yellow. Males that have been a long time upon 

 the host (70 days or more) turn reddish in the light areas about the eyes 

 and sides and the light portions of the back turn greenish. The light 

 areas in the female are yellowish and turn paler when they die. For 

 biology see p. 317. 



Fig. 42. Amblyonnua splendidum 



Oiebel 1877, 9: dorsum (Original, 



G.H.F.X.). 



Fig. 43. Amhlyomma hehraeum 



Koch 1844,. q: scutum 



(Robinson, 1915). 



