44 HYGROMIA REVELATA. 
Geographical Distribution.—Under the names of H. revelatu and 
H. occidentalis this species has been reported from almost the entire extent 
of the European Atlantic littoral, to which regions it was formerly. believed 
to be restricted, but it has now been reported from other and inland districts, 
and, according to Mr. Gude, its known range, which was formerly the fifth 
parallel of east longitude is now extended to the fifteenth degree. 
It has, however, been also recorded not only from Central but from 
Eastern Europe, and if these occurrences prove trustworthy they will 
strengthen the grounds of belief in the decadent character of the species 
and in the evidences of its expulsion from the chief evolutionary area. 
M. Michand cites the Alpine valleys as habitats, while M. Bourguignat 
gives its range as central France, Switzerland, Lombardy, and the 'T'yrol. 
Dr. Kobelt believes it to be a southern and comparatively modern 
species, as no traces of it have ever been found in pre-glacial deposits. 
Fria. 65.—Geographical Distribution of //. reveluta + H. occidentalis Moq. 
Probable Range WHEM Recorded Distribution 
ENGLAND AND WALES. 
Channel Isles—In Guernsey it is locally plentiful on the downs of the south 
coast, and south of Doyle’s Monument. Mr. Tomlin records that it extends to the 
Gouffre, and occurs over the flat ground near Cobo. It was found at St. Peter’s Port 
by Mr. Dodd; and at Moulin Huet by Mr. E. Collier. Numerous specimens 
collected on the adjacent island of Lihou by Dr. Lukis are in the British Museum. 
In Jersey Mr. Benson in 1847 recorded it from the downs on the cliff near Rozel 
harbour; Mr. Dodd found it on the walls of Port Regent; and Mr. F. H. Sikes at 
Corbiére, Plémont, and La More on the west coast and in July 1905 on Green Island. 
In Sark it is locally plentiful on the south downs. Mr. Sikes found specimens in 
Creux Valley, July 1905; and Mr. Wyndham at Dixeart Bay in June 1904. 
In Herm Messrs. Cooke and Gwatkin record it as local but abundant. 
In Alderney Mr. Tomlin records it as rather common on the cliffs. 
Cornwall W.—The southern coast of this extreme westerly section of England 
would seem to be the present metropolis of the species in this country. Mr. W. P. 
Cocks in 1846 found specimens on the Pendennis peninsula and at Falmouth. Mr. 
J. R. le B. Tomlin reported its presence in Sept. 1884 at the Lands End, at Kynance 
Cove, and the Lizard. Mr. J. P. Johnson discovered it on rock ledges ‘‘ high up” 
on St. Michael’s Mount; Rev. Canon Horsley found it at Gwithian, near Portleven, 
in August 1900. Mr. C. E. Wright collected it in January 1905 from the moss- 
covered granite walls by Williams’ farm, Rosekestal; and Messrs. Wright and 
