THE ENTOMOLOGIST. 253 
Larva undescribed. 
Nematus niger, palpis pallidis, aydominis medio et femorum 
posticorum parte inferiori rufis, tarsorum posticorum 
articulo primo dilatato. 
Two species of Nematus, having the first joint of the 
posterior tarsi dilated, have already been described in this 
journal, namely, Septentrionalis, Z., in the second volume, 
and Varus, De Villar., in the sixth, and I had no expectation 
of being able to add a third species, as I regarded the two 
others, mentioned by Villaret, as restricted to the south of 
Europe. When I first saw the imago of this new species, 
running about in a confectioners glass, in which some 
Nematus larve had been placed, I thought that a larva of 
Septentrionalis, which also lives on the birch, had, by some 
mistake, got among them; but I soon saw, to my delight, 
that I had before me a species with which I was hitherto 
unacquainted in the free state. I am again indebted for this 
discovery to the kindness of Mr. de Roo van Westmaas. I 
had, indeed, myself met with the larva in the wood near 
Zeist, and had taken it home and made a drawing of it, but I 
had failed in rearing it. Afterwards, in 1861, I received 
some larve from my friend De Roo, with which I was 
equally unfortunate; but at the end of September, last year, 
he sent me a large number of larve, which [ at last succeeded 
in rearing, so that I have both sexes of the imago. I am, 
however, still unacquainted with the egg. The youngest 
larve which I saw had the appearance represented at fig. 1, 
pl. 8,—very dark brown, almost black, with shining brown 
head and yellow legs. In my earliest notes on this species 
(written at least twenty-two years ago) I make the observation 
that the smallest larve were entirely shining dark brown, 
with yellow anal legs or claspers, and that the yellow colour 
of the anterior and intermediate legs was only acquired after 
the larve had moulted on the 29th of August. The nearly 
full-grown Jarve are of the size and appearance of figs. 2 
and 8. The head was depressed anteriorly, shining, of a dark 
brown colour, approaching black, and covered with very 
short gray hairs; the parts of the mouth were yellow. ‘The 
four anterior abdominal segments yellow underneath; the 
body strongly wrinkled, black, with a shade of brown; the 
