Order PARASITICA. 



Fig. 31 



Body louse ; 



greatly enlarged. 



This order, or sub-order as some prefer to con- 

 sider it, contains the sucking lice, parasitic upon 

 warm-blooded animals generally, other than birds. 

 They never become winged, have 

 practically no transformations, the 

 body is more or less flattened and 



€a? --P-* the feet are scansorial or fitted for 

 &^j&» climbing. The eggs are usually 

 attached to the hair among which 

 they feed. 



Three species attack man, the 

 "crab-louse," for which mercurial 

 ointment must be applied thor- 

 oughly in the infested regions, the 

 "body louse," for which mercurial 

 ointment must be applied in the 

 seams of the infested clothing if 

 that cannot be discarded or steamed, and the 

 "head louse" for which a fine-tooth comb and a 

 thorough rubbing with vaseline or some other 

 greasy pomade is the best remedy. 



On animals the methods suggested for the biting 

 lice may be employed. 



Family PEDICULIDJE. 



PHTHIRIUS Leach. 



P. inguinalis Leach. "The Crab Louse"; occurs 

 in the arm pits and pubic regions of man 

 and woman. 



P. 



PEDICULTJS Linn. 



capitis DeGeer. The common "head-louse " of 

 man. 



Fig 32. — Beak ot a louse, ex- 

 tended, showing blood glob- 

 ules passing between the 

 lancets and the anchor hooks 

 at base ; very much en- 

 larged. 



P. vestimenti Leach. The "body louse", "gray back" or "clothes louse." 



(79) 



