Abstract
It is a well-known fact among entomologists that when disturbed certain coccinellid and meloid beetles fold the antennæ and legs against the body, eject small drops of liquid from the femoro-tibial articulations and feign death. There has been quite a controversy as to how the liquid is expelled so quickly and as to whether the liquid is blood or is a glandular secretion. Those who believe that the liquid is blood fail to show how it passes through the articular membrane to the exterior, and those who think that the liquid is a glandular secretion do not conclusively prove their view and they fail to explain how such a large quantity of the secretion can be expelled so quickly.
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