( dive) 
a gradually increasing amount of black markings in both sexes, 
and in some the costal black spots are becoming linear.” 
In one or two the principal row of spots was a continuous 
black band, broken only by the nervures, and in several the 
costal spots met to form a continuous costal black line. 
Dr. Chapman also exhibited a brood of Acronycta psi, bred 
by Dr. Riding from a @ moth, sent from near Rochester, and 
illustrating well the permanence of varieties and races in this 
species. This dark form of 4. pst was not met with at 
Hereford. He had placed in another box three series of 
A, psi, one of continental origin, the other two selected Here- 
ford forms ; though the differences between them were slight, 
they were constant throughout the series, and in the other 
specimens of the broods which he had not brought. He also 
showed a single specimen of a curious form of A. psi, of 
which he had reared a brood from a captured parent ; 
its smooth aspect, rounded wings, white clouding, straight 
inner line, and almost entire absence of the central prong of 
both daggers, made it very distinct, especially in a series, 
and much resembling A. menyanthidis. This form he had 
called var. bidens. 
Dr. Riding’s series presented about thirty specimens very 
deep grey, like the parent, shading off in thirteen or fourteen 
specimens to about a dozen which were still dark, but not 
markedly so. 
The Continental series were nearly as dark as the lightest 
of Dr. Riding’s brood, but with a less grey tone. 
One brood, bred from Hereford parents, with a very distinct 
white inner border to the subterminal line, showed this line 
more or less marked in all specimens, none being without it, 
as were several in the next series. These were from a 2 
selected for the shortness of the dagger mark; this did not 
affect the whole brood, but was marked in several specimens. 
In further illustration he exhibited series of A. tridens ; 
the usual form at Hereford, where they were fairly 
common, he had divided into two sets—a pink and an 
ochreous. ‘These were not distinct races, so far as he knew. 
They might be so, as sufficient care was not taken to keep the 
broods separate, but he thought both forms were equally 
