25 MARCH 1949, Page 20

Butterfly Migrants

We are all familiar with ringing birds with the object of tracing their migrations. The practice has now been extended to butterflies and moths. Many hundreds were marked last year, both in England and America, and it is now comparatively easy to set a mark on any insect of fair size such as bee or butterfly or moth. For the very first time one of these • marked butterflies has been found—in the United States—but alas! so far the finder has been quite unable to discover the marker or his near address. The English markers have, I believe, invented a sign that tells the finder to send his information to the Zoo.