200 (February, | 
Many of the insects that I have mentioned belong to large genera of 
closely allied species (Mamestra, Agrotis, Gelechia), genera such as 
have been pointed out as the most likely to produce new species by — 
natural selection. These species, however, in spite of their isolation | 
and alteration of condition, are as true, and as clearly defined, as those 
of our present coast. | 
It is also interesting to know that this same tract of sand is the | 
home and almost exclusive habitat of several species not known as — 
attached to sea sand-hills, and seldom or never met with in any other — 
part of the United Kingdom. Among these, I may mention Acidalia | 
rubricata, Lithostege griseata, Agrophila sulphuralis, Spilodes sticticalis, — 
Oxyptilus letus, Eupecilia anthemidana, and Tinea imella, all of which — 
figured conspicuously in the glorious day’s collecting mentioned in | 
the beginning of this paper. The food-plants seem to have nothing 
to do with this partiality, as Sisymbriwm Sophia, Convolvulus arvensis, 
and Erigeron acre, for instance, are common enough in most places. 
Norwich: 14th December, 1870. 
ADDITIONS AND CORRECTIONS TO THE LIST OF BRITISH SYRPHIDA, 
WITH A DESCRIPTION OF ONE SPECIES NEW TO SCIENCE. 
BY G@ H. VERRALL. 
In the January number of this Magazine for last year (vol. vi, pp. 
173—176), I published a list of our indigenous Syrphide, and then 
stated that I believed it very imperfect. During the past year I 
have added several species and two new genera, and have also noted a 
few corrections of synonymy. 
1. Pelecocera tricineta, Meigen : I have seen a female of this interesting 
species, belonging to Mr. J. C. Dale, which was captured near’ 
Bournemouth. The insect resembles a Spherophoria, but is easily 
distinguished by its remarkable antenne. 
2. Didea alneti, Fallen: the asterisk may be removed from this species 
in my list, as Mr. J. C. Dale possesses a specimen from Scotland. 
3. Syrphus seleniticus, Meigen: I have for a long time possessed an 
old specimen of this, probably British, but I know nothing of its’ 
history ; it should be common in England, being found all over the 
continent, extending even from Sweden to Gibraltar and Madeira, 
along with its close ally pyrastri. | 
