E. HiNDLK 277 



Summary. 



1. Tho n\Hults of th«»Ho ox|)«Tiiiu«nt..s hHow that in /*. Iiumatniff viir. 

 corporis thnv typeH of fuinilioH may occur: 



(ci) FiMimle families, 

 (6) Male families, 



(c) Mixinl families, in which there is an indicAtion of some nitio 

 between the numbers of the two sexes. 



2. There is a strong suggestion of the existence of two kinds of 

 females, as well as two kinds of males. 



3. The attached chart gives the pedigree of two families carrie<i 

 through four generations. 



REFERENX'ES. 



Bacot, a. (1917.) " A coutribution to the bionomics of Pediculus humanu* {vetti- 

 menti) and Pedirulu* rtipiti's.'' Parasitology, Vol. IX. pp. 228 — 258. 



HiNDi.E, E. (1917.) " Notes on the Biology of Pedicidxu humanusy ParatUologyy 

 Vol. IX. pp. 259—265, 



Keilin, D. and Nuttall, G. H. F. (1919.) "Hermaphrfxliti.sm and other abnor- 

 malities in Pediculus hunianus." Parasitology ^ Vol. xi. 



Nuttall, G. H. F. (1917.) '' 'V\\e Biology oi Pediculus humanusy Parasitology^ 

 Vol IX. pp. 80—185. 



