LIFE-HISTORIES OF SAWFLIES. Lis 
feeding in the evening, and probably also during the night. 
They feed on birch leaves, and one of them on being touched 
ejected a fluid from some little glands on the side of the body 
above the spiracles. The larve have a smooth round head, 
almost entirely white; the eyes are black, and the jaws brown at 
the top; the body is thick and round, but in appearance some- 
what angular in consequence of the colouring on the back; 
the general tint is yellowish green, the yellow being more pre- 
dominant about the neck, on the ventral surface, and on the 
last segment. The full-grown larve have a blue line running 
along the dorsum ; this line is very fine at either extremity, and 
begins at the second segment of the body, and ends before 
the last, thus not extending from the head to the anus, as in 
Cunbex connata and lutea. On either side of this blue line 
the colour of the skin is yellow, either sharply defined, as in 
fig. 2, or gradually shading off, as in fig. 5. Hach segment 
has seven dermal folds (see fig. 3), four of which bear small 
spines or prickles, very irregularly distributed. The spiracles 
have more or less the form of the sole of a stag’s hoof, and 
- are of a black tint (see fig. 4). The legs, which are twenty-two 
in number, are all white, the six thoracic legs being armed with 
brown claws. 
I had not fed my larve long before they spun up, forming a 
very strong cocoon, almost oval in form, and consisting more of 
threads of a gummy secretion than of silk. The cocoon of the 
greener larva was pale brown, that of the other shining yellow ; 
this latter is shown at fig. 6. In the case of the larva taken 
at Noordwijk, the change into the perfect insect took place within 
ten months; the other, however, took a longer time, and 
remained over the summer, appearing on the 15th of May, 1874. 
This circumstance, coupled with the rarity of the larva in this 
country, was the reason of my not opening the cocoon in order 
to observe the pupa, as I feared that by doing so I might inter- 
fere with the progress of the metamorphosis. 
I obtained both sexes from the larva; from fig. 5 I reared 
fig. 7, and from figs. 1 and 2 I obtained fig. 8. Fig. 9 is drawn 
from an individual captured on the wing. ‘The present species is 
a little smaller than the nearly-allied Cimbex connata and lutea, 
and is distinguished by having the back of the thorax less 
pubescent, and by the colour of the abdomen; moreover, the 
