(xg) 
A COLLECTION OF LARENTIA CITRATA, L. (IMMANATA, Haw.), 
FROM IcELAND.—Mr. L. B. Prout exhibited a series of L. cvtrata, 
L., from Iceland, and read the following explanatory notes :— 
The comparative fewness of Lepidoptera and their generally 
extreme variability in regions where they are subjected to 
rigorous and unstable climatic conditions is a matter of pretty 
general observation, but is perhaps nowhere better exhibited 
than in the fauna of Iceland. The remarkable range of 
variation in that country of the Geometrid moth Larentia 
citrata, L.,* attracted the attention of Staudinger on the 
occasion of his historic voyage, and he published ¢ an analysis 
of the forms met with, recognising eleven as worthy of 
diagnosis. Thirty-three years later the Rev. F. A. Walker { 
discussed his own experiences, although—not being a special- 
isthe made some questionable and even misleading 
comparisons of his material with certain British forms. 
In 1908 § I gave a very full account of the variation of 
this species and its nearest allies. Just recently, through 
the courtesy of Prof. Poulton, I have had the opportunity of 
examining an exceedingly variable Iceland series of L. citrata, 
which furnish the subject of my exhibit this evening, and of 
the present note. 
One of the most interesting facts about them is that they 
were all taken at the same time and place, so that there can 
be no question of local or seasonal variation such as enters 
into the study of the British forms of this species and L. trun- 
cata. They were collected by Mrs. Agnes W. Thomson on 
August 16, 1911, at Hvalfjord, Hals. (S.W. Iceland), 0-50 feet 
elevation, flying in hay. There are 32 examples—21 J, 11 9?— 
varying in condition from perfect to quite worn. 
One ¢ may be regarded as typical, the median area being 
white, rather lightly dusted over with fuscous scales—recalling 
English truncata more than the sharply white-banded citrata 
forms of Britain and Central Kurope. In one other ¢ there | 
may be said to be a pale central area, but this belongs to the 
group I have named ab. imsolida—only a central band of the 
* Vide Trans. City Lond. Ent. Soc., xviii, 39, 40, for the synonymy. 
+ Stett. Ent. Zeit., xviii, 252. { Ent. xxiii, 66. 
§ Trans. City Lond. Ent. Soc., xviii, 33-60. 
