Deronectes depressus, Fab., and elegans, Panzer.. 305 
I have records for depressus, Brit. auct., for 43 out of the 
70 English and for 21 out of the 41 Scottish county and vice- 
county divisions, and it is most probable that the majority of 
these refer to elegans, which is almost certainly a typical 
“ British” species in Watson’s sense of the term *. 
With regard to the distribution of this species in the 
southern Scottish counties, it occurred in the following 
twenty-one lochs :— 
L. Ettrick, Dumfries. 
L. Skene. fs 
Castle L. 
ae ‘ Lochmaben, Dumfries. 
Hightae L. 
L. Kinder. Kirkcudbright. 
Lochrutton L. FA 
Milton L. 
Auchenreoch L. 
L. Aber. ep 
L. Howie. 
L. Stroan. 
L. Skerrow. 
L. Dee. » 
Long L. of the Dungeon. » Kirkcudbright. 
Round L. ,, on; 
L. Narroch. Kirkcudbright. 
L. Valley. rr 
Round L. of Glenhead. Kirkcudbright. 
L. Harrow. 
” 
In Cumberland the only loch I examined other than Talkin 
Tarn was ‘Tindale Tarn, about 3 miles distant, and there this 
species occurred commonly. 
So far I have not found depressus in any British stream, 
but if it occurs in Irish rivers—a point not yet determined, 
as all my Irish specimens are from lochs and canals—it may 
perhaps also occur in Scottish ones. 
I have, or have seen, river specimens of elegans from the 
Nith, Dumfries; Spey, Easterness ; Broadford R., Skye; 
Almond R., Mid Perth; and the Water of Leith, Edin- 
burgh. These river specimens are always more brightly 
coloured than loch specimens, and I think I should not hesi- 
tate to determine female river specimens of elegans even in 
the absence of males. However, if depressus also occurs in 
some rivers it may have brightly coloured individuals also. 
Much remains to be done on the economy of these two 
* ‘Cybele Britannica, or British Plants and their Geographical Rela- 
tions,’ 1847. 
