* KEY TO SUDAN SPECIES OF ARGAS 

 MAIES AM) FEMAIES 



1, Pair of transverse, slitlike organs 

 situated just posterior of anvis. Body- 

 outline generally subcircular or wider 



than long. (Bat parasites) 2 



Ventral paired organs Isicking. Body- 

 outline oblong, considerably longer than 

 wide. (Not bat parasites) 4 



2, Legs as long as or longer than body. 

 Hood present, Periphersil differentia- 

 tion of integument and lateral suture 



lacking A. BOlffiTI 



Figures 2372^,33,34 



Legs shorter than body 3 



3, Body outline considerably wider than 

 long. Hood present. Peripheral dif- 

 ferentiation of integument and lateral 



suttire lacking A. CONFUSUS 



Figures ^5,26,35,36 



Body outline generally subcircular or 

 circular, never as wide as A. confusus . 

 Hood absent. Peripheral integument 



striated and lateral suture present A. VESPERTILIONIS 



Figures 21,^^, 37, 3a 



4, Dorsum with large, depressed polygonal 

 eireas. Size large (l5 mm. -to 22 ram. 



long). (Adults parasitic on mammals) A. ERUMPTI 



Figures 1^,20,31,32 



Dorsvua finely wrinkled. Size moderate 

 (10 mm, long, iisually less). (Fowl 

 parasites ). 5 



- 55 - 



