84 THE ENTOMOLOGIST. 
division of which (f, + ,) soon forks again, forming a very long cell, 
the apex of lower side of which is not far from tip of wing. Discal 
cross-vein at base of discal cell; first posterior cell not much shorter 
than second submarginal; discal cell six-sided, narrowed to the 
squarely truncate base, which is shorter than its side on the second 
basal; its upper apical face distinctly shorter than its lower; upper 
branch of fourth vein (MZ) with a broad fork forming a cell which is 
about twice as long as its stem. Apex of second basal cell forming a 
right angle and projected beyond first basal nearly half length of 
discal cell. Anal vein running close to the fifth for a considerable 
distance, then diverging somewhat from it. Axillary vein with a 
double curve, the second only moderately strong. End of axillary 
vein some distance basal of origin of preefurca. 
Hooley Collection, 1898. Resembles 4. cayuga, Alex., but has 
first branch of media forked as in A. americana, .Alex., and is 
peculiar for the failure of Ri to reach the costal margin. The 
discal cell is unusually short and high. 
(To be continued.) 
EFFECT OF THE EARLY SPRING OF 1920 ON 
BRITISH LEPIDOPTERA. 
By A. W. Mera. 
Prruars it would be as well before touching the Lepidoptera 
of the season to give a few details respecting the dates on which 
one or two of our common trees put forth their foliage in 1920 
as compared with the three years before. These dates refer 
to the Epping Forest district. 
Oaxs.—(1) 1917: On May 6th the Forest was bare; by the 
13th it had burst into leaf. (2) 1918: On April 28th were just 
bursting into leaf. (8) 1919: On May 2nd still bare, by the 15th 
were out, summer weather. (4) 1920: On April 14th a few trees 
in leaf. 
Brercurs.—(1) 1917: On May 6th, on high ground only, a 
few trees in young leaf. (2) 1918: April 28th, just breaking 
into leaf. (3) 1919: May 1st, slightly leafy in places. (4) 1920: 
April 14th, in leaf. 
BuacktHorn.—(1) 1917: May 6th, just coming into bloom, 
and in full bloom by May 18th. (2) 1918: March 31st, some 
bushes out; in perfection by April 7th. (8) 1919: May 2nd, 
just out; by May 15th still out, but getting over. (4) 1920: 
March 11th, several bushes in blossom, and fully out on 
March 30th. 
The Whitethorns were out particularly early, as I saw a few 
sprays of blossom as early as April 14th, although the bushes 
were not in full beauty until May 9th; but with this tree I had 
made no previous notes for reliable comparison. 
By these dates it will be seen that this year was a particularly 
early season as regards vegetation, and it would appear that the 
