1. Anal groove distinct, extending 

 anteriorly around anus. Scutum 

 without eyes, festoons, or oma». 

 mentation, dt? with seven shields 

 adhering to ajid almost entirely 

 covering ventral surface. (Rare 



in the Sudan) IXODES 



Figures 212 to 235 



Anal groove distinct or indistinct 

 but never extending anteriorly around 

 anus, ct? with fewer (2 to 6) or no 

 ventral shields, these partially non- 

 adherent and only circumanal 2 



2. Without eyes. (Basis capituli rec- 

 tangular dorsally) 3 



With eyes k 



3. Palpi narrow, elongate; segment 2 at 

 least twice as long as wide. (Rep- 

 tile parasites ) APONOMMA 



Figures 9b to 103 



Palpi conical, short; segment 2 about 

 twice as wide as long. (Mammal or 



bird parasites) HAMAPHYS&LIS 



Figures 128 to 157 



4. Palpi as wide as or wider than long 5 



Palpi longer than wide (Common, 



usually large ticks ) 8 



5. Large ticks with colored ornamentation. 

 Basis capituli rectangular dorsally. 

 (Rare in Sudan, parasites of elephant 



and rhinoceros ; DERMACENTOR 



Figures 120 to 127 



Small or moderated-sized, imornamented , 



common ticks. Basis capituli usually 



hexagonal dorsally 6 



- AO- 



