Deronectes depressus, Fab., and elegans, Panzer. 297 
characters, taken in conjunction with the thorax-characters, 
generally enable one to separate the males with comparative 
ease, and so far, with one exception, I have always been 
able to determine the species on these characters, a subse- 
quent examination of the edeagus confirming my previous 
determination. 
3. The Aideagus.—In the northern species this organ, 
viewed from above, has a broad apex, while in the common 
form it has a pointed one, and until my recent visit to Gallo- 
way I regarded this character as definitely proving that we 
have two distinct species. On looking through my additional 
material from eighteen more lochs, I had no difficulty in 
separating the males of the two forms on the thoracic and 
i 
Apices of sdeagi of specimens of D. depressus (“the northern species ”) 
and D. elegans (‘the common species”), chosen to show the range 
of variation.—Figs, 1-9. D. depressus (1, Talkin Tarn ; 2, L. of the 
Lowes; 3, L. Urr; 4, L. Doon; 5-9, L. Dungeon). Figs. 10-18. 
D. elegans (10, 11, KR. Spey; 12, 18, Long L. of the Dungeon ; 
14, L. Stroan-; 15, L. Aber; 16, L. Skene; 17, Broadford River, 
Skye; 18, Moorlinch, N. Somerset). 
tarsal claw-characters except in one case—Loch Dungeon, 
the specimens from which I put down as ‘‘ uncertain.” On 
examliuing the edeagus of these specimens I found a range of 
width in the apex from that of typical ‘‘ northern” specimens 
to a comparatively narrow and bluntly pointed form (vide 
figs. 5-9 infra). 
Now I had previously noticed that there was a variation in 
