66 THE ENTOMOLOGIST. 
Till I measured the Rosevear specimen the above was the largest 
‘high’ male or var. forcipata known to me. _ It is probable 
that Mr. Bright’s Freshwater specimen, on my method of 
measurement, has callipers slightly more than 10 mm., because 
they were apparently measured in situ. The latter method 
is quite unsatisfactory when a large series is being measured to 
ascertain the amount of variation, because the degree to which 
the bases of the callipers are telescoped into the last abdominal 
segment differs in a series of individuals. So I always extract 
the callipers to expose the small process, a kind of condyle, 
which is situated on the external margin of the calliper and is 
usually only just hidden by the last abdominal tergum. The 
callipers are then laid on squared mm. paper and measured in a 
straight line from the ‘‘condyle”’ to the distal extremity, the 
curvature being disregarded. This is permissible, because, though 
‘‘high’’ males possess straighter callipers than do the ‘‘low,” as 
the correlation is constant the curve of variation is not vitiated. 
Unfortunately the body of the Rosevear ‘“‘high” male was 
damaged either at capture or in subsequent transport in spirit, 
so that it could not be set symmetrically for photographing. 
I have not yet measured the other Rosevear males, but there 
are many which closely approach the example illustrated. Taken 
altogether they seem to possess in both body and callipers the 
largest average dimensions of any collection from one locality I 
have seen. 
Zoological Laboratory, Cambridge: December, 1913. 
THE NEUROPTERA OF NOTTINGHAMSHIRE. 
By J. We Care, M.A,de.s.; 2 .G.8: 
(Professor of Biology, University College, Nottingham.) 
THE distribution of these insects in Britain is still so in- 
sufficiently worked out that a list of the species recently taken 
in Nottinghamshire may be of some use. With few exceptions 
all have been collected during 1912-13 by myself, and every 
specimen recorded has been identified or confirmed by Mr. 
Kenneth J. Morton, to whom I am greatly indebted for much 
generous assistance with this and other groups of Neuropteroid 
insects. 
Srauip# (Alder-flies). 
Sialas lutarca, Linn.—By rivers, canals, and ponds everywhere. 
S. fuliginosa, Pict.—EHaton, near Retford, May 29th, 1901. 
RapuHipup# (Snake-flies). 
Raphidia notata, Fab.—Epperstone Park, May 12th and June 
