120 
Psyche 
[December 
spect to the characteristic shape of their own species, they 
lacked the faculty to “recognize” the female even after they 
came in direct contact with the other individual. The .bed 
bug in this respect is more sensitive. It is true, by the 
sense of sight it does not distinguish a dead object from a 
live individual, but, upon coming in contact with it, it imme- 
diately recognizes the female. As mentioned above, the 
piece of cork was mounted and dismounted very quickly. 
The crude carving could not produce the natural shape of 
the bed bug and the male recognized the imitation very 
readily. When a male mounts another male, the lower one 
usually bends the tip of his abdomen upward; he thereby 
causes a change in his normal shape and form which, in 
turn, causes the upper male to dismount. Otherwise, the 
latter orients himself in the characteristic fashion as if he 
were a female. The shape of the latter stimulates the male 
to orient himself obliquely as described in the foregoing, 
rather than laterally. The sense organs of touch along the 
ventral sides of the last abdominal segments of the male 
are unequally distributed (Text figure 1). It seems that 
the shape of the female in this position is so stimulating 
that even a dead individual calls forth the final copulatory 
reactions. 
Literature Cited. 
Barber, H. S. 1929. Personal communications. 
Gragg, F. W. 1914. A Preliminary note on Fertilization 
in Cimex. Indian Journ. Med. Res. II No. 3, p. 698. 
1920. Observations on the Respiratory 
System of Cimex with Special Reference to the Be- 
haviour of Spermatozoa. Indian Journ. Med. Res. VIII 
No. 1, pp. 32-39. 
1925. Observations on the Respiratory 
System of Cimex. Indian Journ. Med. Res. XII, pp. 
451-455. 
Hase, A. 1918. Beobachtungen fiber den Kopulations- 
forgang bei der Bettwanze Cimex lectularius L. Sitz- 
ungsber. Ges. naturf. Freunde, Berlin. VIII, pp. 
311-321. 
Mayer, A. G. 1900. The Mating Instinct in Moths. Psyche, 
IX, pp. 15-20. 
