BOARMIA ROBORARIA. 29 
interrupted, dull yellow central stripe, characteristic 
of the genus. Legs pointed and curved inwards, dull 
chocolate-brown, the first joint paler than the others. 
When at rest the larva greatly resembles a twig, 
the notched head being exactly similar to two oak-buds. 
The single larva went down on June 10th, and the 
imago, a female, appeared on the 5th of July, 1872. 
(George ‘Il. Porritt, December 11th, 1872; Hut., 
January, 1873, VI, 281.) 
_l am indebted to Mr. W. H. Harwood for repeated 
help in rearing this species, enabling me at length to 
offer an account of all its stages. With larvae sent in 
1868 I failed entirely, but succeeded much better with 
egos in 1871; and this past spring (of 1874) I have 
again been furnished with a larva after hibernation, 
in order to make sure of one or two points. 
The eggs reached me on the 5th of July; the larvee 
were hatched on the 15th, and I soon put them out- 
doors on a young oak; when about three-quarters of 
an inch in length they hibernate, taking up a position 
on a twig, and remaining motionless as if growing 
from it; about the end of January, 1872, I found them 
enawing the back of the twigs, and this they did at 
intervals till they had barked all the twigs of their 
oak-plant, and checked the development of the buds ; 
so that on looking at them about the end of March I 
found some dead from starvation, and the survivors 
looking shrunken ; | now put them on a fresh plant, 
the leaves of which had been forced, and on these, as 
well as on the tender green stems of the new shoots, 
they fed well, becoming full-grown towards the end of 
April or beginning of May; the moths appeared be- 
tween June oth and 12th. 
The egg, as is the case in this genus, is small in 
proportion to the moth, of flattened oblong figure, 
one end blunter than the other; the shell down the 
sides reticulated in regular rows of four-sided meshes, 
with knots or httle knobs at the angles, and generally 
one or two extra on one of the four sides, as though 
