118 
Psyche 
[December 
ilar results were obtained. On one occasion, the two were 
tipped over so that the writer could observe, under the 
microscope, the protruded genitalia, attempting to open the 
copulatory slit situated between the fourth and fifth ab- 
dominal sternites of the dead female. 
The question will arise as to whether the dead female bed 
bug had some odor emanating from her which stimulated 
the male. It might, also, be suggested that the odor of the 
glandular secretion, if there is such, may be preserved in 
the female a long time after she is dead. Attempting to 
clarify this matter, one female was chosen which had been 
preserved in 70% alcohol for sixteen weeks. After she had 
been blotted and dried, she was placed in front of the male 
and was then moved slowly with the brush, imitating the 
crawling of the live bug. The male reacted to this dead 
female in the same manner as described heretofore. How- 
ever, a still better proof that the sight of the crawling 
female, rather than the odor emanating from her, brings 
the male to her, may be derived from the following experi- 
ment. 
A piece of cork was carved out into the size and approxi- 
mate shape of a bed bug. After it was painted with ink and 
dried, it was placed in front of a male and moved slowly 
with the brush, again imitating the crawling of a bug. The 
male suddenly jumped upon it in the same manner as if it 
were a live female bed bug, but soon dismounted. A few 
other males reacted in like manner. 
It is clear, therefore, that not the odor, but the sight of 
a moving female, awakens in the male when he is under 
proper physiologic conditions, the desire to come in direct 
contact with her. It is also a noteworthy fact that the 
males lack the faculty of distinguishing between the two 
sexes, or even a lifeless object of the same size and shape. 
Recognition of the female occurs through the sense of touch 
when the male is in direct contact with her. It is then that 
the male orients himself in a different manner with refer- 
ence to the surface of the body of the female. 
Such reactions were observed by the writer in some 
beetles. In the potato beetle, L. 10~lineata, the male is of the 
same hemispherical shape as the female ; consequently males 
