The Vectors of Relapsing Fever 



Female Male 



503 



Ovum or nit Embryo 



Fig. 203. Pediculus capitis, or head-louse. X 10. a, Female; b, male; c, egg 

 cemented to a hair; d, nymph. (From Beattie and Dickson's "A Text-book of 

 General Pathology," by kind permission of William Heinemann, Publisher.). 



Male 



Female 



Embryo Ovum 



Fig. 204. Pediculus vestimenti, the clothes or body louse. X 10. a, Male, 

 b female; c, nymph; d, egg. (From Beattie and Dickson's " A Text-book of 

 General Pathology," by kind permission of William Heinemann, Publisher.) 



