370 THE ENTOMOLOGIST. 
of Teredo have been politicians, and not naturalists; and, 
although describing with accuracy and minuteness its struc- 
ture and habits, had regarded it from a political rather than 
a zoological point of view. It may also be observed, that it 
is possible, indeed almost probable, that the little marine 
wood-borer already mentioned may have caused much of 
the damage attributed to the Teredo, for it was the piles that 
suffered most, and especially at or about the level of high- 
water mark. It has been supposed that Teredo, formerly 
abundant on English coasts, had become extinct; but this is 
evidently a mistake, for it seems certain that the destruction 
of the bridge at Teignmouth was effected solely by its 
operations. Teredo is a long worm-shaped and worm-coloured 
animal, with two very manifest shells attached to one extre- 
mity. Five species are recorded as British, and have received 
the names of navalis, malleolus, nana, norvagica and palmu- 
lata; but these, supposing them to be distinct species, are 
indifferently alluded to under the Linnean name of navalis. 
The mode in which Teredo perforates wood has been fully, 
and I may say exuberantly, but not conclusively, discussed. 
Some assert that it can bore through copper, and even iron; 
and I was once subpoenaed as a witness to prove this 
capability ; but, not being cognizant of the existence of this 
power, I declined to express an opinion, and, therefore, 
was not called. 
Argynnis Valezina at Canterbury.—I have taken several 
of this beautiful variety near Canterbury, and have seen 
several others during the past week; also some fine Adippe ; 
both of which I have not taken here before.—G. Parry ; 
Church Street, St. Pauls, Canterbury. 
To me this is an interesting and unexpected discovery. I 
acknowledge I had heard of Valezina having been seen in 
Kent, but not taken; and I know we are so subject to errors 
of the imagination, that I have often taken leave to deduct 
one-half from the value of occurrences not verified by capture, 
on the principle that “a bird in the hand is worth two in the 
bush.” 
To set Hymenoptera.—\I shall be much obliged if you 
will inform me, in the ‘Entomologist, how Hymenoptera 
are set; whether pinned or carded; and whether the 
wings are extended or allowed to remain along the 
