3g 
22 
6¢ 3% 
28 Mr. J. W. Tutt on recent Experiments rm 
Normal size of second-brood 7. bistortata ; 
ground-colour distinctly ochreous in tint ; 
strongly developed transverse markings. Two 
of these were October emergences. 
Much suffused with fuscous; strongly 
marked,small,size of second-brood 7. bistortata ; 
one emerged July the other September 29th ; 
the only two of Bacot’s insects yet examined 
that approach the Scotch bistortata form. 
It may be well to mention here that these tiny speci- 
mens are not infrequent in inbred 7’ bistortata. Such a 
brood as this last is practically useless for comparative 
purposes. 
SPECIMENS BRED BY Mr. PRovt. 
Ill. Hybrid between f T. bistortata (Clevedon) x & 
T. crepuscularia (York).—One batch of eggs; 15 imagines 
examined, emerged from June—August, except one speci- 
men, which emerged September 26th; no pup going 
over the winter. 
ig 39 
3h 5g 
32 
ete 
Pale, differing but little from summer 
T. bistortata except that the females are 
poorly marked, the transverse bands being 
ill-developed. 
Pale, with the square spot (noted in Batch 
I of Dr. Riding’s crosses, and Batch VI @ and 
B of Mr. Bacot’s) well developed ; females 
paler than males. 
Suffused with the ochreous tint of 7’. bistor- 
tata early brood ; more strongly marked. These 
were the last to emerge, two in August, and 
one on September 26th. The last is the 
most strongly marked specimen of the brood. 
Complete brood ; no pupz going over. 
Dr. Ripine’s EXPERIMENTS (Continued). 
Besides obtaining reciprocal crossings of the parent 
species, pairings of the hybrids were obtained by Dr. 
Riding, between June 13th and 26th as follows :—(1) ¢ 
