29 
together a very fine variable lot, by taking it in large numbers at the 
Hill of Scolty. The pretty, light-grey forms with distinct markings 
(infrequentata , Haw.), which generally turn up amongst a British 
series must, I think, be rarer on tbe Continent, though I have one or 
two from Simplon and Arolla running towards them. I have said 
that I do not consider this a thoroughly well-differentiated “ab.,” nor 
do I feel certain that Haworth’s “ subcinereis ” quite represents it, 
though his citation to his infrequentata of “? cyanata, Hb.” favours 
Guenee’s idea that he must have been dealing with a pale form, and 
as Guenee’s interpretation seems to have priority, it is best to follow 
it. Stephens (Cat. Brit, Ins., ii., p. 141 ; List Brit. Anim., v., p. 194) 
also cites infrequentata as a “ var.” of caesiata, but gives no diagnosis. 
On the whole, British examples average somewhat smaller than those 
from central Europe, the normal measurements, as taken from my 
series, being respectively 30-33mm. and 32-35mm. I have seen the very 
dark forms ( nigricans , mihi), from several localities, such as Shetland, 
Paisley, North Wales (Leech coll.), Yorkshire, etc. Possibly a better 
percentage are obtainable from the Shetlands than elsewhere, though 
Hoffmann (Stett. Ent. Zeit., xlv., p. 369), assumes that Shetland 
specimens do not differ from the rest of the Scotch, since Jenner Weir 
does not particularly mention the species; and he (Hoffmann) adds a 
foot note that he has seen caesiata from Arran with deep black-grey 
forewings, only shot with white on the nervures ( i.e ., ab. nigricans), thus 
forming a sharp contrast to the washed-out grey forms which he has 
seen from Iceland (? glaciata) and the north of Norway (norvegica). A 
few Shetland specimens which I have seen show the brownish colour 
of ab. (var. ?) glaciata, but it is difficult to judge of tbe exact status of 
this form without access to fresh bred specimens, as both wear and 
fading are apt to make them appear more brownish. Barrett mentions, 
in addition to various aberrations, what may possibly be a local race, 
but as I have not been able to study it, I can say nothing on the 
subject at first hand. His words are: “ Lastly, specimens from 
North Wales seem to show a faint tinge of green, and are otherwise 
dull and shaded off.” For the most part, as he says, the colour 
variations in this species “do not appear to be local” to an)' material 
extent. 
The general run of European forms (excluding the Arctic) may be 
treated together. They belong mainly to the type form and ab. 
annosata, with an occasional ab. nigricans. The British Museum 
collection has fairly definite examples of the latter from the Mutzell 
collection (one, ? locality), and the Zeller collection (one from Freyer, 
? locality, and another from Stelzing), but these are pretty uniformly 
dark, without such distinct white dots as are inclined to appear on our 
British ab. nigricans. There is also a curious dark specimen from the 
Frey collection (Engadine) which looks almost as if it might be a 
a melanic example of some other species of Entephria, perhaps on 
account of the distinct double row of white dots, the depth of the 
arches in the subterminal, and the darkened hind-wings, recalling those 
of caeruleata, Guen. (? flavicinctata, var.), but which I have decided is 
veritable caesiata; this is presumably the specimen recorded by Frey 
( Lep. Schweiz, p. 231) as taken in 1853. To the ill-defined ab. annosata 
may be referred two from the Zeller collection (one “ Schlucken-Alp,” 
from Freyer, the other Baibl), one from the Leech collection (Denmark) 
