318 
Hermaphroditism etc. in Pe die ulus 
tunities arise under natural conditions for both races of lice to intermingle, 
as will be found by reference to Appendix II which follows (p. 325). 
II. 
SOME OTHER ABNORMALITIES IN PBDICULUS HUMANUS . 
The abnormalities already described as occurring in hermaphrodites are 
(1) fragmented dorsal bands [Specimens 12, 19, 20, 22, etc.]; (2) distortion 
of the male or female genitalia [in numerous specimens]; (3) the presence 
of a supplementary gonopod [Specimen 47]; (4) double vesica penis [Specimen 
83]; (5) dilator not fusing to a point but ending in two rami [Specimens 53, 
83]; (6) various invaginations, etc. [numerous specimens]; (7) duplication of 
posterior abdominal lobes [Specimens 29, 31, etc]. 
A B 
Text-fig. 24. Pediculus humanus race corporis, <$$ (A) and (B). Lot N. 265, British, raised in 
Cambridge, with abnormality of dorsal bands. In (A) the dilator ( cLil .) is protruded and bent 
down upon the dorsal surface of the abdomen. (N. del.) 
Apart from the foregoing, we have observed other abnormalities, un¬ 
connected with hermaphroditism, which possess considerable interest: 
Abnormalities affecting the dorsal bands in the male. 
(Text-fig. 24.) 
In Lot N. 265, P. humanus race corporis of British origin, raised on black 
cloth in the Quick Laboratory, we found two males which presented a similar 
appearance in respect to the dorsal bands. In one specimen (A) the second, 
third and fourth pairs of bands are abnormal, the third pair appear reduced 
and pushed to the left by the obliquely displaced and deformed succeeding 
bands. The second specimen (B) differs from the foregoing as illustrated. 
