434 Rev. F. D. Morice on Saws of 2 Dolerids.. 
inwards! In Plate XXIV, 10, on the contrary, this 
margin is sinuated distinctly though not very conspicuously 
outwards. And in other cases, as a rule, it is practically 
a simple straight line. Plate XXV, 4 again (the common 
species aeneus, Htg. = elongatus, Thoms. Cam., etc.) I 
can always recognise by the evidently concave curvature 
of each of the cutting edges and their consequently 
small and acute-looking actual apices. In other cases, 
on the contrary (e.g. Plate XXIV, 9, XXV, 3, etc.), these 
cutting edges are either practically straight or slightly 
convex, and this makes their apices appear less prominent. 
But on the whole, though I can generally recognise a saw 
at once as either belonging or not belonging to this group, 
I should have to look to other characters, puncturation, 
sculpture of head and thorax, etc., before venturing to 
name the insect possessing it. 
Picipes = leucopterus, Zadd. (Plate XXV, 5), is a saw 
which I can always identify by its curiously lumpy apex, 
combined with its convex, much denticulated (though the 
denticulations are very small), and very slightly projecting 
“teeth.” This and the two next species (gonager and 
niger) seem to me more or less transitional between the 
last group (aeneus, etc.), and another which includes all 
my remaining figures (Plate XXV, 8 to 12 inclusive). 
This appears to me a very distinct group, characterised 
by (a) the very broad and blunt apex of the saw, (b) the 
very slight and inconspicuous separation of the cutting 
edges, (c) the fact that these cutting edges form an almost 
continuous line and are not placed as usual more or less 
en échelon, (d) the very close and regular denticulation 
of these cutting edges, even those quite near the apex of 
the instrument, (e) the straightness of these edges—neither 
concave nor convex. 
Most of these peculiarities are to be found also in gonager 
and niger, but those species have 4 much less broad and 
more pointed apex than in gibbosus, megapterus, etc. (Plate 
XXV, 8 to 12), and on that account I do not actually 
include them in the gibbosus group, but prefer to treat 
them rather as forming a transition towards it. 
or 
