G. H. F. Nutt ALL 
899 
Fig. 8. Chart recording the movements of a Phtkiriis $ in the same way as described for 
the male in Fig. 7. To make the day-numbers synchronize, the female having hatched 
two days after the male, her day of emergence as a first stage larva is charted as 
Day 3 (instead of Day 1), and the day of her death is given as Day 33 (instead of 
Day 31). The numbers therefore correspond in point of date in both charts and the 
relative positions of the sexes can be compared on any given date. The open circles (°) 
along the track of the female denote where eggs were laid at the bases of hairs. 
26—5 
