218 tApiil. 
them and the description with the type of A. Scylla ; the two species 
are nearly allied, but I think quite distinct. 
One distinctive characteristic occurring in Scylla, and not men- 
tioned above, does not appear to exist in A. Werang, and I think it as 
well to notice it as additional evidence of their specific distinction, 
viz. : — the veins on the under-side of the hind-wings in Scylla are 
powdered with whitish scales. — A. G. Butlee, Brit. Mus.] 
Lepidoptera at Bannoch in 1867. — The well-known entomological locality of 
Rannoch is that part of N. W. Perthshire surrounding Loch Rannoch, a lake about 
eleven miles in length, and lying east and west. Immediately from its shores rise 
hills, whose slopes are covered with native thickets and woods of birch and alder, 
with an undergrowth of heath and heather (Erica cinerea, E. tetralix, and Calluna 
vulgaris), our four native Vaccinia, Myrica Gale, &c. 
In one part a large forest of pine (Pinus sylvestris) extends for about three 
miles along the southern shore of the loch, and is aptly termed, from its sorabi-e 
appearance, the " Black Wood."* 
Why Rannoch should be so much richer in insects than other places apparently 
as suitable is not altogether easily accounted for satisfactorily. I believe, however, 
that its elevation, its undistui'bed surface thickly but openly wooded, and its 
western situation, must all be taken into consideration. On consulting a map it 
will be seen that Rannoch lies decidedly in the western half of Scotland, and this is 
confirmed by the occurrence of insects and plants that are rarely, if ever, found in 
the eastern half. 
More especially I allude to Acidalia funiata, &c., and to Drosera intermedia and 
Hypnum fiagellare. 
Perhaps another reason for Rannoch's superiority may be owing to the great 
extent to which it has been "worked." Every year some species are added to its 
Fauna, and not always are these Boreal insects, but sometimes, species that seem 
(at least in Britain) to affect a more southern range, e. g., Stilbia anomalaf and 
Sterrha sacraria, discovered as Rannoch iiisects by the Messrs. Blackburn this 
season. 
No one who has studied the " Manual" can have failed to have noticed a great 
similarity between the Fauna of the Lake District in England and that of Rannoch 
in Scotland. In the Lake District we have a similar elevated region of lakes and 
mountains, with a like western situation. The Lake District, however, far out- 
numbers Rannoch in the variety of the species it produces ; but this may be 
accounted for by its far greater extent (two counties and part of a third), its more 
southerly situation, its climate, and its larger Flora. 
Rannoch, as far as my observations have gone, does not possess many more 
than 280 flowering plants, while the Lake District has nearly three times that 
number (721). 
• Not " Black Forest," as often stated. A " forest" in tlie Highlands is often entirely destitute of 
trees, and simply means a tract of country set apart for the red deer. — F. B. W. 
t Has this not been taken at Kiinnoch before ? — Hoa. 
