26 Mr. J. W. Tutt on recent Experiments in 
IT. Hybrids between $ T. ab. delamerensis x 9 T bistor- 
tata.—No. 2a above. One batch of eggs hatched April 
6th; some larve full-fed by May 9th; larve mostly like that 
of the ? parent (bistortata) only a few having the apex of 
the A open like the larva of 7. crepuscularia. Most of the 
larvee pupated about the middle of May. Imagines com- 
menced to emerge early in June, at first rapidly and after- 
wards more slowly until the end of June; there was then 
a break until July 16th, when they again commenced to 
emerge and continued to do so at intervals until the first 
week in September; one specimen emerged during the 
last week in October. 58 specimens examined all males— 
29 pale and 29 dark specimens. 
18 f —? Of a cold grey colour, near (but whiter 
than) the normal second brood of 7’. bistortata, 
just showing the dull grey suffusion so charac- 
teristicof Yorkshire 7’.crepuscularia; the trans- 
verse markings and shades well developed. 
ti¢ —?¢ Having the same well-marked characters as 
the last, but strongly suffused with ochreous. 
29 f The ground-colour of an uniformly cold 
steely grey, only two showing a suspicion of a 
_ warmer brown tone, otherwise uniformly dark 
like ab. delamerensis; the darker transverse 
_ lines and shades obsolete, the whitish sub- 
_ terminal line moderately developed but not 
conspicuous; irregular grey patches and 
_ streaks on all the wings. 
58g —? al pupa unemerged on November 16th. 
This brood is most uniform in size, rather larger than 
is usual in second-brooded 7. bistortata. There is a very 
strong, albeit almost indefinable, suspicion of both parents 
in every specimen, due perhaps to the general tendency 
towards a slight lengthening of the wings, a tendency to 
ochreous in some, the running of the markings into trans- 
verse bands, all characters of 7. bistortata; whilst the 
whiter ground colour, the defined character of the square 
spots (one at the lower end of the discoidal cell, the other 
on the submarginal line) tend towards 7. crepuscularia, 
and taking the brood as a whole it distinctly leans towards 
the latter. Few of these emerged late, but these are the 
