18 
Hymenoptera 
Pimpla stigmatica n. sp. 
Of the 2 forms of Hymenoptera, of which impressions have been 
found in cement-stone, one belongs to the family Ichneumonidœ. 
Only one specimen of this latter has been procured; head and thorax 
are very badly preserved, abdomen a little better. The wing venation 
and the long ovipositor, however, make it quite clear that we have 
to do with a representative of the subfamily Pimplinae , and with the 
very genus Pimpla. 
A small number of Tertiary Pimpla species (all from Oligocène 
deposits) has been described, it is, however, to be observed that these 
species do not all belong to the genus Pimpla in the present sense 
of the word, and no Pimpla has till now been recorded from the 
Eocene deposits. 
The present species is characterized by its bicoloured stigma 
which is basally pale, distally dark. It is true that many recent Pimpla 
species have the very base of stigma pale, but in the present case 
the pale colour covers about half the stigma. The 2nd cubital cell 
is triangular with a short peduncle, the basal vein (m-cu -f- the in¬ 
nermost part of M) almost straight. The radial cell of the hind wing 
is rather small, it issues proximally at about one third from the apex 
of the wing. The legs have been strong. Abdomen appears the 
broadest between the fourth and fifth segment. Ovipositor ca. half 
as long as abdomen. Length (ovipositor included) 11 mm. Length of 
anterior wing 7 mm. 
1 specimen. Thy (poss. Min. Museum). 
