132 Browne: The Aquatic Coleoptera of the Isle of Man, 
mixed up in other series, and I was able during my stay to 
collect eighty-two species. I did not find eight of the species 
of which I had records, and all are represented in Dr. Bailey’s 
collection, and there were two other species in that collection 
which I did not find during my stay in the island, so that the 
total list of water beetles is now ninety-two species. 
My visit was during the last week of June and the first week 
of July, by no means the best time of year, and there are pro- 
bably other species which w.ll be added to the list. Such 
species as Hyphydrus ovatus, Rhantus exoletus, and Acilius 
sulcatus have not yet been found in the island. 
The island seemed to me a very good collecting ground for 
water beetles. Dr. Bailey (l.c., p. 29) says, ‘ Ponds are scarce, 
except for a series of old marl pits on the edge of the old cliff 
line to the south of the Ayre.’ I did not find the ponds to- 
which he refers, but in the northern plain, especially in the 
neighbourhood of Andreas, small ponds occur in most of the 
fields. There are streams of all sizes in all parts of the island, 
and the only groups of water beetles in which the Isle of Man 
is really deficient are the lake fauna and the halophil fauna. 
Except for one or two reservoirs, which I did not visit, there 
are no lakes, and I could not find any salt marsh areas. 
With eleven exceptions (Snaefell, four, Point of Ayre, three, 
and Curragh, four), Dr. Bailey’s specimens were all taken in 
the south of the island, 7.e., south of the railway from Douglas 
to Peel, and the great majority of his records are for the. Port 
Erin district. My records are chiefly tor the north of the 
island ; I did not visit the Port Erin district, and only made 
one excursion to Castletown and Douglas. 
Amongst the species taken on the island one of the most 
interesting is Bidessus minutissimus, which I found in the Sulby 
river, the only place I searched for it. I only took two speci- 
mens, one on each occasion that I looked for it, but these are 
sufficient to establish the record. Now that this species has 
occurred in Devonshire, Isle of Man, and Solway districts, I 
have little doubt but that it will be found in suitable rivers along 
the west of England. 
Of other river and stream species Deronectes latus was com- 
mon in the Sulby river, accompaned by Hydroporus septen- 
trionalis, Deronectes depressus and WD. 12-pustulatus and 
Hydrena testacea. In my previous experience this last species 
has always occurred in stagnant ditches or ponds, but it was not 
uncommon in one part of the river in moss on stones. <Agabus 
guttatus Was common in the mountain streams, and I took a few 
specimens of Orectochilus villosus in the north of the island. 
Dr. Bailey took a number of specimens of this last species in 
th> south. 
Although I searched carefully for it, I failed to find Hydro- 
Naturalist, 
