al 
Ixii 
more, most of the rather garish figures of cardwi vars. in 8. L. 
Mosley’s “ Varieties of British Lepidoptera ” (1878-1885) were 
clearly forms of elymi. 
Comparing the examples it became obvious that elymi was 
itself extremely variable. The two Oxford specimens exhibited 
to the meeting were very different, and that from Porto Santo 
remarkable in the straight-cut outer margin of the hind-wing. 
But, in spite of much individual difference, the pattern as a 
whole was the same and the same markings became dyslegnic 
which were eulegnic in cardut. 
Whether by reversion, which seems to offer the more prob- 
able hypothesis, or by. spontaneous variation following some 
line of genetic least resistance, it was obvious that isolated 
communities of cardui tended to produce from time to time 
individuals transitional towards elymi, or elymi itself. 
ASCLEPIAS CURASSAVICA L., SOUGHT BY THE IMAGO OF 
Papitio HomMERUS F.—Prof. Poutron exhibited examples of 
this Asclepiad, well known in the tropics of both hemispheres, 
collected by Mr. Scoresby Routledge in April 1921, at about 
800 ft., from open grassy meadow-land on the John Crow 
Mountains, Jamaica. The interest of the exhibit lay in the 
following note sent with the specimens :— 
‘ Papilio homerus sucks the nectar from the blossom, sway- 
ing down the plant by its size and weight. One was observed 
going to twenty plants in immediate succession, 7. e. to all 
the plants in bloom on the spot.” 
LIBYTHEA PROBABLY L,. LAIUS TRIM., CONGREGATING, PER- 
HAPS BEFORE OR DURING MIGRATION.—Prof. POULTON said 
that he had received the following note from Mr. C. F. M. 
Swynnerton. The observation was made on the Miombo- 
Kilossa Road, Tanganyika Territory. The facts recorded 
and referred to in Trans. Ent. Soc., 1921, pp. 404, 405, made it 
probable that the habit described was associated with migra- 
tion. The late Mr. Farquharson’s observation that the 
migrating W. African Libythea labdaca Westw., settled in 
culverts (ibid., p. 405) supported Mr. Swynnerton’s suggestion 
that some inorganic substance was sought by butterflies of 
this genus, as it is believed to be by many Hesperidae. 
“ Dec. 24, 1920.—Libythea, apparently laius, is here some- 
Ae 
