INFESTING THE DIFFERENT RACES OF MAN. 573 
cannot believe that the Australian is different from the Esquimaux because he has 
proportionally a much longer leg, neither can I believe that the Australian Pedi- 
culus is different from the Slave Lake Pediculus, because it has a longer and 
straighter penultimate joint to its tarsus. If the curved tibia of the African does 
not constitute him a different species from races with straight tibias, neither should 
the greater or less curvature of the joints of the tarsi in the Pediculi be considered 
to form specific distinctions in them. It happens, however, that not only are the 
differences, both between man and man, and Pediculus and Pediculus, very 
similar in degree, but they are also differences of the same kind. They are 
differences in colour and proportion of the very same, or, at all events, analogous 
parts in both. To attempt to draw any deductions from these differences in the 
Pediculi, would therefore, as it appears to me, be something very like begging 
the whole question. 
Unsatisfactory though the result of my inquiry may thus be deemed, | 
cannot look upon it as wholly thrown away. We now know what the truth of 
the matter really is, and no longer need to argue in the dark upon doubtful 
premises. 
Explanation of Terms. 
Fig. 1. Male. Fig. 2. Female. 

a. Claw. 0. Penultimate joint. c. Tibia. d. Femur. 
k e. Shoulder joint. : 
spine of thumb. h. Tassel. ¢. Lamina. Pilgae dis) THamb., e--capiesl 
j. Salient angle. &, Re-entering angle. 
Fig. 3. 
MMO 
a. Simple. 6. Rippled. ¢. Waved. d.Toothed. «¢. Serrated. 
