19H.] _ 237 



of the Dardanelles. Of the other European members of the same 

 Natural Order, Periploca grseca, L., extends throughout the Mediter- 

 ranean region as far west as the Rock of Gibraltar, and Vincetoxicum 

 officinale, Moench, is found throughout the warmer parts of the 

 Continent, reaching as far north as Denmark and Sweden. As, more- 

 over, according to Saunders (Scudder, I.e. p. 737), the larva has been 

 discovered on Apocynum androssemifolium, L., it is quite possible that 

 the well-known Nerium oleander, and the "periwinkles," Vinca major 

 and V. minor, also members of the Natural Order Apocynacese, would 

 not be refused. In captivity at any rate the larva appears to adapt 

 itself to an even more unlikely pabulum. Dr. Seitz states (Macro- 

 Lep. Pal. Eegion, I, p. 76), "I have always found the larva at large 

 on Asclepias, but young caught caterpillars accept as food also lettuce, 

 thriving very well on such food." It is in the highest degree im- 

 probable, though, that the insect would take to this food of its own 

 free will. Although both the above-mentioned species of Vinca are 

 common enough in the South of England, I greatly fear that the 

 capricious nature of our climate, especially as regards summer tempera- 

 ture, will effectually prevent the establishment of Danaida plexippus 

 as a resident in our Islands. 



In the accompanying sketch-map I have endeavoured to mark the 

 progress of Danaida plexippus across the oceans, by means of the 

 dates on which it was first recorded from the stations (marked with 

 a small cross) mentioned in the preceding pages of this paper. The 

 figures indicating the century are omitted, and the approximate 

 limits of the range of the butterfly in North and South America are 

 shown by dotted lines. 



Aorangi, Lonsdale Koad, 



Summertown, Oxford : 

 August, 1914. 



A NOTE ON OREOPSYCHE PYRENAELLA, H.-S. 



BY T. A. CHAPMAN, M.D., F.Z.S. 



Plate XI. 



I had the pleasure of renewing my acquaintance with this 



species last July (1914) at Gavarnie. I had previously found it there 



in 1907. In that year the cases were abundant in a small and defined 



area near the entrance of the Val d'Ossoue. In 1914 I looked over 



this area carefully and could find only one or two examples, but not 



