38 |July, 
Re-oecwrrence of Triplax Lacordairti at Darenth Wood.—I have, in the early part 
of this summer, again taken Triplax Lacordairii at Darenth Wood in fungus, as 
before.—G. C. Cuamrion, 274, Walworth Road, S.H. 
[This insect has also occurred to Dr. Power and Mr. O. Janson, at the same 
place.—Eads. | 
Occurrence of Cordulia metallica, Van der Lind., a Dragon-fly new to Britain.— 
No sooner is the “‘ Catalogue of British Newroptera”’ published, than I have to 
record an important addition, and which, but for an oversight, would have been 
inserted in its proper place. It is Cordulia metallica, of which a series of males 
were taken by Dr. F. Buchanan White in Strathglass, Inverness-shire, last year. 
Wanting duplicates of C. arctica for a continental friend, I asked Dr. White to 
obtain some for me. He did not visit Rannoch, the locality in Scotland for that 
species, but sent up several insects from Strathglass, which he imagined to be the 
same species, and as such they remained with me for some time without examina- 
tion. In fact, I had sent over all but one example before becoming aware of the 
mistake. The species is allied to arctica, but more robust, the abdomen broader, 
the face with a broad transverse yellow band, the appendices of the male without 
internal teeth, and the wings of the female (of which I have not yet seen a native 
example) with a broad yellowish costal margin. It had already been considered as 
British, 1 believe by Van der Linden himself, but on the authority only of a bad 
figure in Harris’ “ Exposition of English Insects,” which is probably intended for 
our more common species, C. wnea. 
There is no reason why we should not possess in Britain all the European 
species of Cordulia. C. enea, L., is widely distributed throughout these islands, 
but local; C. metallica, V. d. L., is now recorded as Scottish (widely spread over 
Europe) ; C. alpestris, Selys, occurs in Lapland, Austria, and the Alps, and ought 
to be found in Scotland; C. arctica, Zett., found at Rannoch, in Scotland, and Kil- 
larney, in Ireland, is like the last, an alpine or boreal insect; C. Curtisii, Dale, 
found in the New Forest and Dorsetshire, in a southern form, not occurring again 
till we reach the south of France, and the Iberian Peninsula; (C. flavomaculata, 
V.d. L., has not been seen here, but is widely distributed on the continent.—R. 
McLacuian, Lewisham, 8th June, 1870. 
Note on Dimorphism of American Cynipide, S’c.—The following extracts from 
a letter I have lately received from Mr. Homer F. Bassett, of Waterbury County, 
U.S.A, may present some interest. Mr. Bassett writes: 
“My own observations tend to confirm the theory of Dimorphism; and the day 
“is not far off when the unisexual species will be correctly referred to their bisexual 
“progenitors. The gall (on a species of oak) of which I send you a sketch was 
“‘ gathered a few days since (March, 1870), and I find it filled with perfect gall- 
‘insects, only their wings are not fully developed,though in them the peculiar venation 
“is plainly seen. But all I have cut out of these galls are females; their abdomens 
“are full of eggs, and they are, I have no doubt, the dimorphic form of an unde- 
“ scribed Cynips that was found in countless numbers in galls on the petioles of the 
“leaves of the same tree last June. I reared many hundred of them last summer, 
“and Iam waiting patiently till this spring generation shall appear, to learn —first, 
“Gf it will contain any males; secondly, to compare them carefully with the June 
