Figvires 60 and 61, dorsal and ventral views 



CRNITHCDCROS MOUBATA CAPITUUM 



PLATE XXII 



When preparing to engorge, the tick inserts the chelicerae 

 and hypostome (not the palpi) into the host skin as far as the 

 dorsal conical prolongation of the basis capitulx. 



During feeding (according to Bertram), the dilatation and 

 constriction of the pharynx by certain muscles cause the fluid 

 contents of a closed chamber just posterior of the tonguelike 

 process to be forced into and sucked out of this process through 

 a vertical septum. Furthermore, relaxation of hypostomal muscles 

 obliterates the hypostomal gutter as the dilated pharynx constricts 

 to force ingested blood into the esophagus. The effect of this 

 swelling of the tonguelike process and closure of the hypostomal 



- 16^ _ 



