98 THE ENTOMOLOGIST. 
in fresh examples, so I hope it may be possible, once the range of 
distribution of athalia and pseudathalia is ascertained, to separate 
them also one from the other. Dr. Reverdin states that he has no 
record of the two species occurring together ; further, that the black 
markings of athalia appear to be much more accentuated and 
dominant than in pseudathalia. Collectors abroad this year, or those 
who have accumulated duplicates on the Continent to any extent, 
will greatly assist Dr. Reverdin by providing him with additional 
material for his researches. Examples already examined from 
localities east of the central European Alps to the Amur and Japan 
are so far identified with the true and original athalaa.—H. Rowtanp- 
Brown; Harrow Weald, February 5th, 1921. 
DISAPPEARANCE OF AGRIADES CORYDON AB. SYNGRAPHA FROM THE 
CuiLTEerRNs.— May I express my appreciation of Mr. Rowland-Brown’s 
remarks under the above heading in your February issue. It is 
unfortunately true that the gentleman with the ‘coal sack” has 
been too much in evidence during the past few years. It is almost 
unnecessary to refer to the extinction of Chrysophanus dispar and 
the sadly diminished numbers of Papilio machaon, but it would 
appear that unless something can be done many other species are 
likely to disappear from their favourite localities. A few instances 
from my own little experience may not be out of place in this connec- 
tion. Some years ago I, in company with two other enthusiasts, 
made an attempt to establish P. machaon in a certain locality in the 
Kssex marshes. A number of pup were ‘“ planted ”’ in a spot where 
food-plant was abundant, and the whole surroundings approximating 
to machaon’s habitat in Fenland. That many imagines did emerge 
is certain, for in one week a farm-hand brought two males to me 
which he had knocked down with his hat. The following week several 
more were taken in the district. The matter was noised abroad, and 
despite our appeals that machaon might be respected for at least one 
season, in a short time the neighbourhood was over-run by every 
‘collector’? within reach. The project was, possibly, a little 
ambitious, but I feel convinced that, given a sporting chance, 
machaon might have established a colony in a new locality. Again, 
when on leave from France in the summer of 1916 I was fortunate 
enough to discover T'hecla w-album in considerable numbers in a 
hitherto unsuspected locality in Kent. In this case history repeated 
itself. Last summer, when roaming around in the county last 
referred to, I was much surprised to see a fine specimen of Aporia 
crategi, which I duly netted. Two more were seen within half-a- 
mile of the spot. From general observation in this district I am 
sanguine that crat@gz is making a determined effort to extend inland, 
and in this case I am emulating Brer Rabbit.—F. Howarp Lancuny ; 
‘‘Rernside,”’ Shepherds’ Lane, Dartford. 
A New Non-CorrosivE Pin.—There is no need to emphasise the 
advantages of a pin which will not corrode or ‘ verdigris”’ in use or 
when in contact with cork carpet, sour paste and the various sub- 
stances now used to preserve our collections. The necessity for such 
a pin is felt more by micro-lepidopterists than by collectors of other 
orders, because of the small size of the pins they use and the short 
