E. Y. Thomson, J. Bell and K. Pearson 
3 
the two were then reinvestigated. Now it will be noticed (see Tables II and III) 
that the character B is the sole one in which the relative or absolute variability 
of the autumn queens falls below that of the spring queens. We at first believed 
this to be due to the possibility that the present series had been determined with 
greater exactitude than was adopted in the earlier series, but a remeasurement of 
the cell b of the spring queens has not justified this hypothesis. 
Right Wing. Vespa Vulgaris. 
x I 
LETT WiNG. Vespa Vulgaris. 
X 
Y 
We reproduce the list of actual measurements made for reference. 
(A) Total length of wing reckoned from the tip of wing outside of cell i to 
the inside of the vein at the end of the cell b. Cf. Figs. I and II. 
(B) Greatest length of cell b taken inside thickened end of veins. 
(C) Length of cell /"from point to further inside point on vein fg. 
(D) Greatest breadth of wing from X to wherever found, i.e. X Y. 
(E) Distance apart of ,/ and H measured inside veins of cell /. 
(F) Greatest length of cell d, measured inside cell. 
(G) Distance apart of points P and Q measured inside cell I. 
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