32 Mr. J. W. Tutt on recent Experiments in 
Overt S 
9¢ 
122 102 
The brood from which the parents were 
selected was remarkably free from any ochre- 
ous tint, the two selected as parents for this 
brood being absolutely without a trace. These 
12 f and 1 § are of the same well-marked 
type as the parent form ; the males, however, 
ochreous, more suffused in colour, and rather 
smaller. The later emerging males are darker 
than those which emerged first. The female 
is white, with distinct transverse lines and 
bands, and the shape of the wings is parti- 
cularly bistortata-like. 
These bear no resemblance to either parent, 
nor to either species from which derived. Five 
of the specimens are of a clear white ground- 
colour, and five are tinged with ochreous. The 
former have the base and centre of the wings 
with only the faintest traces of the transverse 
markings; theseare rather more evident (though 
still inconspicuous) in the others. The speci- 
mens all agree in having the inner part of the 
normally pale submarginal line of the fore- 
and hind-wings conspicuously white (as in 
well marked ab. delamerensis), edged internally 
with a very dark, blackish-fuscous line, which 
develops a conspicuous costal blotch and a very 
distinct, dark, square spot (about a third down 
from the apex) on the forewing, reaching to 
the fringe. This gives the specimens a distinct 
resemblance to 9 7. consonaria, but, in the 
latter, the square spot is most strikingly 
developed in the elbowed, and not on the 
submarginal, line. The same spots are clearly 
traceable in 7’. bistortata and T. crepuscularia, 
but never show up conspicuously as in these 
specimens. The hindwing is similarly marked 
with a conspicuous antemarginal band. One 
is much reminded of the dark band of Acidalia 
trigeminata, but in that species it is the 
elbowed, and not the antemarginal, line that 
is affected. 
