38 CORRESPONDENCE. 



legged Warblers (Sylvia loquaxj, Blackcapt Fauvets, and Willow Warblers, 

 arrive at the first, or perhaps at the first and second comings ; tor a few of one 

 or two of these generally precede the appearance of all these kinds. At the next 

 batch come the rest of the species enumerated, together with most of the 

 Locustells, Cuckoos, Redstarts, and Nightingales, many of the Chimney, and 

 some of the Window, Swallows, the earlier Whitethroated and Whitebreasted 

 Fauvets, Sedge and Marsh Reedlings, Whin Chats, and perhaps, an early Garden 

 Fauvet or two. Then at the following coming, along with the remainder of the 

 above, arrive the Wood Warbler, the Grey Flycatcher, and the Swift; and 

 another period intervenes ere the Nightjar arrives. There indeed appear to be 

 alternate fortnights of arrival and non-arrival, corresponding with the age of the 

 moon, the migration being also secondarily subordinate to the state of the weather, 

 being promoted by a southerly breeze, and much retarded by gales from the 

 opposite direction. These will be found to be about the usual periods, selecting 

 the medium week, which may form the fortnight, according to circumstances, 

 with the week preceding, or following it ; namely, first week in April, Blackcapt 

 Fauvet, Darklegged Warbler, Fallow Chat, Bank Swallow, Willow Warbler, 

 Wryneck ; second week, to the 15th : — Cuckoo, Nightingale; third week, to the 

 29th : — Garden Fauvet, Wood Warbler ; 13th of May : — remainder of the small 

 birds. 



Tooting, Surrey, April 21, 1836. 



CORRESPONDENCE. 



PAPILIO PODALIRIUS A BRITISH INSECT. 



To the Editor of the Naturalist. 

 Respected Friend, — Having noticed a good deal of dissension respecting the 

 genuineness of Papilio podalirius as a British insect, I take this opportunity of 

 announcing, through the medium of your Journal, that I myself possess a pair 

 which I believe to be British. I met with them under the following circum- 

 stances:— Happening to be at Portsmouth, the summer before last, for the first 

 time, I enquired, as is my usual practice on going to a town before unvisited by 

 me, for .collectors of Natural History specimens. I soon found one, and among 

 the collection was a pair of the above-named species. The owner assured me 

 they were British, that they were caught by a person she employed in the neigh- 

 bourhood, and that she set them up herself. As it would not be worth her while 

 to have imposed upon me in this instance, and especially as she did not seem 

 aware of the value of the specimens, I feel no doubt but they were really British. 



