9264 Insects. 
-was quite wet and covered with drops when found. The prolegs were 
white; at the end of the, penultimate joint was a small black trans- . 
verse line, while the last joint was longitudinally striped with black. ’ 
The claws were black, the belly and legs entirely greenish white. 
The larger of my larvz was thirty-seven millimetres long. J cannot 
well remember whether these larve fed during the day time, or at 
night, and I have made no note of the circumstance; I think the 
former, in which they would agree with the large Cimbex of the alder, 
and not with Cimbex Betuleti. They fed voraciously. Their excre- 
ment was somewhat remarkable, for each particle had a small reddish 
spot on one side, the remainder being quite black (see fig. 6). 
At the beginning of August the larve were full grown. The one 
which I had found at Brummen began to spin up on the 10th of 
August. This one came out at Leyden on the 25th of April, 1861. 
The one from Velp had already spun up on the 2nd of August, and 
came out a few days before the other. They spun up between the 
leaves and the bottoms of the boxes in which I had placed them. 
The cocoon was brownish yellow, single, very hard, shining, strongly 
cemented, and very smooth inside (see fig. 7). 
The perfect insects are very handsome creatures, as may be seen by 
a glance at figs. 8 and 9. The first represents the male, the second 
the female. The external distinctions between the two sexes consists 
solely in the thickness of the femora and the appearance of the under 
side of the abdomen. 
The head is brown on the vertex, and the cheeks darker above the 
antenne; below them and on the clypeus shining yellow, and every- 
where covered with fine brown hairs. The antenne consist of five 
joints and a thick knob, which again appears to be composed of three 
joints, but this circumstance is not quite clear. The first joint is 
short, thicker than the following one, brown, hairy; the second is the 
smallest, also brown; the third is much longer, round, narrow, some- 
what expanded at the end, brown at the base, becoming obscure orange 
further up; the two following joints are also of this latter tint, they 
are of very nearly equal length; the thick round knob is also con- 
colorous with them. 
The compound eyes are dark purplish brown, oval, prominent; the 
three simple eyes of the colour of garnet. The upper jaws are 
bidentate, dark brown; palpi pale brown. Thorax brownish black, 
and thickly hirsute, the prothorax bright yellow, and the scutellum 
red; the sides below the wings are also more or less red. The tegule 
are shining black, the posterior margin being yellow. Wings shining, 
