Xi 
Amorpha populi Linn. (1) $ and 3. Right dg, left 9. 
Bexley, Kent. (2) 4 and }. Right 9, left g. Kéepenick, 
Berlin. 
Cosmotriche potatoria Linn. Almost $ and 4. Right 9, 
left g with shght 9 coloration. Great Britain. 
Dendrolimus pint Linn, Sand}. Right 2, left g. Lichter- 
feld, Berlin. 
Dendrolimus excellens Butl. } and 3. Right gy, left 9. 
Bred Berlin, ex Japonia. 
Lasiocampa quercus Linn. } and 4. Right 9, left ¢. 
sreat Britain ex Webb coll. 
Orgyia antiqua Linn. 4 and 3. Right 3, left 9. Larva 
Silesia, bred Berlin. 
Saturnia pavonia Linn. (1) $ and 3. Right Q, left ¢. 
Wiesbaden. (2) } and}. Right 3, left 9. North Germany. 
Telea polyphemus Cram. 4 and }. Right dg, left 92. 
Baltimore. 
Rothschildia orizaba Westw. 
Bred Elberfield, ex Mexico. 
Actias artemis Brem, 43 and 3. 
Amurland. 
Brahmaea ledereri Rog. 
Dicranura vinula Linn. 
Prussia. 
Sciapleron dispar Stdgr. Sand 3. Right 3, left 2. Guelt- 
es-Stel, C. Algeria. 
Notes oN THE MiGraTion OF LEPIDOPTERA, WITH A SUG- 
GESTION AS TO THE CAUSE OF THE BACKWARD AND FORWARD 
FLIGHT OCCASIONALLY OBSERVED.—Prof. PouLron said that 
ever since the receipt of Mr. A. R. Sanderson’s observations 
on the morning and evening flight of Delias and the associated 
moths at Bukit Kutu (Proc. Ent. Soc. Lond., 1920, p. Ixin; 
1921, p. v) he had been thinking about the curious facts, 
and had at last hit upon a probable explanation. It was 
briefly this—(1) that the direction of the migratory flight of 
certain species and in certain localities was determined and 
kept up by a sensitive relationship to the wind-current; and 
(2) that, if such a migrating stream reached a locality where the 
morning and evening wind blew in opposite directions, this 
oe 
and 3. Right 4, left 9. 
nie 
Right 9, left g. Sidemi, 
and 3. Right 3, left 9. Cilicia. 
and $. Right 3, left 9. . Posen, 
oe woe 
