A. Genital apron a wide triangle composed 

 of a protruding anterior ridge and a 

 deeply, abruptly depressed, narrower 



posterior button H. IMPRES3UM 



Figures-lVb and 177 



Genital apron a wide shield with a 



broad posterior margin and not 



divided as above 5 



5. Girc\imspiracular area hirsute. 

 Middle segments of two pairs of 

 hind legs lacking dorsal enamel- 

 ling H. RUFIPES 



Figures iS^ and 185 



Circumspiraciilar area glabrous, or 

 with few hairs. Middle segments of 

 two pairs of hind legs enamelled 



dorsally H. TURMICUM 



Figures'"206 and idU7 



6. Genital apron an elongate triangle 



or circiilar 7 



Genital apron distinctly wider than 



long, a transverse oval, triangle, 



or shield 10 



7. Genital apron a narrowly pointed 

 triangle with lateral margins 

 definitely longer than dorsal margin; 

 gradually depressed in profile. 

 Scut\im usually as wide as or wider 

 than long; with few, scattered large 

 punctations; uncommonly with scat- 

 tering of smaller punctations; 

 surface frequently rugose. Usually 



large ticks H. DROMEDARII 



FigTore's 164- and 165 



510 _ 



