PARASITE OF HUMAN LICE 



55 



thus becoming the pre-flagellate form in the new 

 host. From a rather small chromatophile area in 

 each, near the blepharoplast, a thread forms, extends 

 forwards, and reaches the surface, from which it 



FIG. 12 HERPETOMONAS PEDICULI : PRE-FLAGELLATE TO 

 FLAGELLATE STAGES 



A-F show gradual lengthening of the body and elongation of 

 the flagellum. G shows a pre-flagellate organism dividing 



protrudes abruptly as a free flagellum (Fig. 12, B-F), 

 often as long as the body of the parasite. In some 

 other species of Herpetomonas the flagellum may 

 even exceed the body in length. The non-flagellar 

 end lengthens also (Fig. 12, D), and finally the long 



