Cooley & Kohls: Argasidae of N. America, etc. 



71 



creased by feeding but the mammillae become much flattened and in some 

 species, including O. tuncata and O. parkeri, are visible only as shining 

 sclerites not agreeing with their descriptions. Similarly, the folds and grooves 

 may disappear almost completely and be visible only as faint remnants. As 

 specimens in Ormthodoros, the 'best ticks are those that have been depleted 

 until the dorsal and ventral body walls are about parallel. 



i m. . 



A 



C 



Si- 



B 



D 



Fig. 29. A. Omilhodoros turicata (Duges), fourth nymphal stage, dorsal view. 

 B, Same, ventral view. C, 0. par^eri Cooley, fourth nymphal stage, dorsal view. 

 D, Same, ventral view. 



