242 REV. F. A. WALKER, D.D., F.L.S8., ETC., 
noctuz seem to luxuriate in the hot air in the neighbour- 
hood of the geysirs. Noctua conflua is the commonest 
species of thick-bodied moth, and its forewings are very 
variable in tint, reddish, brown, or greyish ; the reddish type 
being the most abundant, Three-fourths of the noctue that 
I saw at the geysir belonged to this one kind. 
Crimodes exulis, common in Iceland, is rare in Scotland, or 
else replaced there by a closely allied species, Hadena 
assimilis, “the northern arches.” Between the commoner 
British species and C. exulis there would appear to exist, 
however, some confusion. However, there are different 
types of Crimodes exulis as occurring in Iceland also, the 
ordinary type having been taken by me at Reykjavik, and 
a particularly melanic form having been brought me by a 
friend from Krisuvik. 
The total absence of large, or showy-coloured species is 
another noticeable fact. Most of the moths are dusky or 
marbled so as to be undistinguishable from the lichen on the 
boulder, or from the lava rock when settled, and so escaping 
detection. 
Points oF SIMILARITY AND DIVERSITY BETWEEN ICELAND AND 
THE E'AROES. 
Similarity. 
Absence of trees, 
Houses built of wood. 
Same common genera of Coleoptera, Nebria Calathus, &c. 
Helophilus pendulus among Diptera, common to both. 
Diversity. 
Oats and barley in Faroes, No cereal in Iceland. 
Tipula oleracea in Faroes. Not in Iceland. 
Mountain ash, small oaks, willows, sycamores, in gardens in Faroes. 
Only mountain ash in gardens in Iceland. 
Greater warmth of climate in Faroes and productiveness accordingly. 
Potato crops, currant bushes, &c., larger, more abundant and flourish- 
ing in Faroes than in Iceland. ‘ 
Caltha eu palustris, larger and more plentiful in Faroes than in 
Iceland. 
Larger size of blossoms of Euphrasia officinalis in Faroes than in 
Iceland. 
Forficula auricularia in Faroes, not in Iceland. 
Neater paths through fields, stiles, &c. ; signs of greater nearness to 
civilization in Faroes than in Iceland. 
Narthecium ossifragum, Polygala, Scabiosa, in Faroes, not occurring in 
Iceland so far as my observation goes. 
