Dcioiicctcs (lcpre3.su<^, Fuh.^ and clogaiis, Panzer. 303 



brock L. being tlic only other locb in tlie list which gave a 

 like result. 



Seeing that D. ilepn'ssus is a northern species, I certainly 

 oxpccteil to fuul it at higher altituiles than D. elejans, ami 

 yet, whereas the latter occurred in several lochs above the 

 1000-foot line, usually with the true " Arctic " species 

 D. griseo-sfriatuSy the former was in no loch above this 

 level — in fact, excepting L. Dungeon, which is about 1000 

 feet above the sea, all the other lochs in which it occurred are 

 at a much lower altitude. 



The halnts of the two species seem to bo identical. In 

 some places the beetles occur in shallow water at the side, so 

 that they can be caught without one having to take off shoes 

 and stocking.^, while in other places the only way to get them 

 is to strip and go in almost to the waist. In one part of 

 L. Doon, for instance, I got a few specimens in about 2 feet 

 of water, but none closer in, whereas in another part I failed 

 to get any until I .-^craped about in the shallowest places. In 

 Loch Dungeon I caught a single specimen in the shallows, 

 and then found them in abundance in a place where the gravel 

 suddenly sloped downwards into deep weedy water. In Loch 

 Narroch I got nothing until I stripp'-d and went in, and then 

 I found plenty of specimens in 3 to 4 feet of water. Again, 

 in Loch Ken, wading to the knees enabled me to obtain a 

 dozen and more specimens within five minutes. 



Possibly, of course, the beetles vary their depth at different 

 times, and the same plaeeina loch might yield quite different 

 results at different hours or on different days; but I have not 

 yet investigated this j)oiiit, and am merely recounting my 

 experiences in obtaining my material. 



With regard to the Britannic distribution of the two 

 species, I have already mentioned that aj)parently only 

 I), depressus occurs in Ireland, and I have in my collection 

 or have seen specimens from Antrim, Fermanagh, Cavan, 

 Sligo, ajid Cork West. In Britain the only counties in 

 which I have so far taken this species are Cumbeiland, 

 •Selkirk, Dumfries, Kirkcudbright, Ayr, and perhaps Dum- 

 barton (Loch Lomond) ; but in the latter case I have only a 

 female specimen, and, as I have said, I do not feel quite 

 certain as to the species in the absence of a male. 



Of the thirty-two lochs examined in which one or other of 

 the two species occurred, depressus was only found in eleven, 

 and the following is a list of these : — 



Tulkin Tarn. Cumberland. 



St. Miirv's Loch. I .. n • i 

 , - . • , \ .Selkirk. 



L. of the Lowes. 



