Browne: The Aquatic Coleoptera of the Isle of Man. 157 
present records are only for the northern half, 7.e., for most 
of the coast counties from Dublin to Mayo W. 
Paracymus nigro-eneus which is represented in Dr. Bailey’s 
collection by a sie specimen, probably also belongs to this 
group. Its English distribution is southern and _ western, 
although it extends along the south coast eastward as far as 
Kent.* In Ireland it is decidedly western, the only records 
being for Kerry S., Galway W., and Mayo W., and in Scotland, 
also, it is at present only known from Argyll Main, Mid. Ebudes, 
and North Ebudes. 
Several other Manx species have a distribution which in 
Britain is chiefly southern and eastern, but in Ireland is southern 
and western :—Copelatus agilis, for instance, has its ‘ centre’ 
in the south-eastern counties of England, spreading northward 
as far as Yorks. N.E. and Mid W. and westward to Lancs. S., 
Chester, Salop, Glamorgan, Devon S., and Cornwall (E. or W. ?) 
The only Scottish record is for Dumfries. In Ireland it has 
been taken in Wexford, Cork Mid (of Praeger), and Galway W. 
Similarly Helochares punctatus is chiefly eastern and south 
eastern in England, though there are records for Devon N., 
‘and Cornwall W., Chester and Derby, Yorks. Mid. W:, and 
Cumberland. In Scotland Dr. Sharp records it from Moncrieff 
Hill (Perth Mid),f and it is not uncommon in the Solway dis- 
trict. One specimen has also been taken in Midlothian. In 
Ireland the records are for Cork W. (of Praeger), Galway W., 
and Mayo W. 
Cymbiodyta ovalis, on the other hand, with an English dis- 
tribution somewhat similar to that of C. agilis, is recorded in 
Ireland, from Meath and Cork Mid. (of Praeger), having there- 
fore what might perhaps be called a south eastern range there. 
A few of the Manx species belong to Watson’s ‘ Scottish ’ 
and * Highland ’ types, e.g., Hydroporus morio, H. melanarius, 
H. obsoletus, etc., but with the possible exception of Ilybius: 
subeneus there are, apparently, none of his “ Germanic’ type 
species in the Manx fauna. This is an interesting fact as it is 
in agreement with what has been observed in other groups of 
the fauna and in the flora. 
Some interesting points are brought to light by comparing 
the water-beetle fauna with that of the surrounding districts 
of England, Scotland, and Ireland. The nearest point of Eng- 
land to the island is St. Bee’s Head, Cumberland, which is 
about thirty miles distant. Burrow Head, Wigtownshire, is 
only sixteen miles, the Mull of Galloway being rather more 
distant, while the county Down coast is about thirty miles 
away. 
* The record for Essex N.; refers to P. eneus, vide ‘EM: M,’, xxxv., 
7201990, and » Ent INeG.,, xt. 254.6 L607. 
t Col. of Scotland, ‘ Scottish Naturalist’, 1871-8. 
1gtt April 1. 
