KEY TO FAMILIES AND GENERA OF ADULTS* 



MALES AND FEMAIES 



A. Dorsum covered by leathery integiiment 

 lacking scutum. Mouthparts ventral. Eyes 

 absent, or present in lateral folds. Spi- 

 racular plates small, anterior of coxa IV. 



CSof t ticks'" )..... . FAIRLY ARGASIDAE 



Tigures 8 to 63 



Body periphery flattened and usually 

 structurally different from dorsiim; 

 lateral suture usually present**. 

 (From birds, bats, or their resting 

 places; only A. brumpti from mammals 



or lizards ). .7 .ARGAS 



Figures 13 to 38 



Body periphery undifferentiated; 

 lateral suture absent, (Thick, 

 leathery ticks from houses, corrals, 



burrows , or retreats ) . aRNITHCDaROS 



Figures 8 to 12, 39 to 63 



B. Dorsum completely covered by scutum (cS:?) 

 or anteriorly covered by scutxam ($9). Mouth- 

 parts anterior. Eyes absent, or present near 

 lateral margin of scutiim. Spiracular plates 



large, posterior of coxa IV. ("Hard ticks'") . FAI^HIZ LCCDIDAE 



Figures U to 7, 6'^I^T5 



^Characters in this key do not necessarily apply to species within 

 the same genera from areas outside of the Sudan. Two other genera, 

 Otobius (Argasidae) and Rhipicentor (ixodidae), occiu* in the Ethiopian 

 Faunal Region outside of the Sudan and are not listed in this key, 

 A few other genera occur in other faunal regions. Another family, 

 Nuttalliellidae , is known only from Southwest Africa. 



**The peripheral differentiation of A. boixeti and A. confusus is 

 only slight and these species lack a''lateral suture. 



- 39- 



