330 
Mrs. T. Vernon Wollaston on 
Even amongst the comparatively few specimens which I 
possess, hardly any two are exactly similar. Some, for in¬ 
stance, are without the confluent postmedian lines, having only 
a very faint single one; others, again, have them very large 
and conspicuous and forming almost a band; whilst in others 
the ground-colour is quite white and not irrorated with dusky 
scales. 
Acidalia atlcintica. 
Acidalia atlantica, Walk., in Melliss’s Saint Ilel. 187 (1875). 
This pretty little Geometer is not uncommon in St. Helena, 
both at low and intermediate elevations, more especially per¬ 
haps the former, where it attracts the eye as a very pretty 
object, resting, with its wings horizontally expanded, on the 
rough stone walls which fringe the outskirts of the unprotit- 
able tracts of the prickly pear (Ojpunlia vulgaris , Mill.) above 
Jamestown. 
Genus 19. Sterrha, Iliibn. 
Sterrha sacraria , Linn. 
This extremely pretty and widely distributed Geometer is 
not uncommon in the intermediate districts of St. Helena; 
but I did not observe it so high as the central ridge. Indeed 
even Plantation is rather above its normal range, though 
during our residence there I obtained it sparingly. Put about 
Woodcot, which is distinctly lower, it was quite abundant 
(particularly on open grassy slopes) ; and at Cleugh’s Plain 
it was even commoner still. It therefore evidently prefers 
hot and sunny spots rather below what I have usually cited as 
strictly intermediate. My specimens are of a light pale 
delicate hue, and do not present that variety of colouring 
which characterizes this species in more northern climes, and 
which has been considered by some writers to be partly owing 
to this delicate tropical species adapting itself to a colder 
climate, when it has been observed that their texture is denser 
and their general form more robust. It occurs in Madeira 
and the Canary Islands, as also in Asia Minor, Cyprus, Syria, 
throughout Africa, and India; and specimens of it are con¬ 
stantly recorded as being found in the British Isles; indeed 
each year it seems to be becoming more plentiful. 
Fam. V. Pyralidse. 
Genus 20. Pyralis, Linn. 
Pyralis far inalis, Linn. 
The common European P. farinalis has completely esta- 
