* SPAN-WORMS. 189 
LARGE BLUE-STRIPED LOOPER. 
( Biston ypsilon Forbes). 
Early in August 1898 several nursery people complained 
about a large caterpillar that was causing some injury to 
young apple trees, many of which had been entirely 
defoliated. When visiting these nurseries on the following 
day the worms had all disappeared, and only a single 
specimen was found in the yround, very much contracted, as 
it was ready to pupate. As this insect is evidently capable 
to cause much injury the description given by Prof. Forbes 
is here repeated, ‘ The single male specimen bred is of a 
brownish gray color; head dusky gray; palpi black; antennz 
dusky, widely pectinate; thorax gray, with three transverse 
dark lines, the anterior and middle arcuate, the posterior 
straight. The front wings are brownish-gray, speckled 
with black on the basal and terminal thirds, marked with 
three transverse black lines with the space between the first 
and third pale gray, minutely speckled with black, these 
specks taking the form of transverse lineations on thecosta. 
The inner line is obliquely arcuate, its inner end being about 
half the distance of the outer from the base of the wing. 
The third line is sinuate, bending broadly forward around 
the end of the discal cell and then running nearly directly to 
the internal margin. The middle line is straight, and joins 
the inner end of the third before it reaches the internal 
margin. About one-half the distance from the third trans- 
verse line to the posterior margin is a jagged pale transverse 
line extending across the wing. The posterior wings are 
pale gray marked with two transverse lines, the inner of 
which is straight and the outer sinuous like that of the fore- 
wing. Beyond this is an obscure subterminal whitish band, 
upon the middle of the wing between these lines is a distinct 
black spot. The wing beyond the outer transverse line is 
more irroate with dusky, the fringe pale with blackened scales 
