D. Keilin and G. H. F. Nuttall 319 
We have raised the progeny of both these males, crossing them with 
normal females, but the first generation only yielded normal specimens. 
On the other hand, among hundreds of the same stock as the foregoing, 
are found a d, similarly deformed, which, on dissection, revealed three normal 
testes, two on one side and one on the other. The three testes contained ripe 
spermatozoa. All the other organs appeared normal. 
Text-fig. 25. Pediculus humanus, cross between capitis and corporis, <$ (Bacot’s Lot 1.), showing 
leg abnormality. (A) Ventral aspect of whole specimen; (B) dorsal aspect in part. (N. del.) 
Abnormality of the legs. 
(Text-fig. 25.) 
A male specimen, contained in Lot I. of Bacot, the offspring of capitis <$ 
and corporis $ (see p. 316), presents a peculiar leg abnormality. The second 
and third legs of the left side are fused together to form a large mass which 
is curved posteriorly. Nevertheless it is possible to recognize the different 
parts composing the insect’s leg. These parts have lost their mobility, but 
Parasitology xi - * 
