312 
pean countries and no doubt has ever arisen as to its 
identity. 
The following is the description of the genus: 
Antenne proportionally short, inserted on a level with 
a line through the lower third of eye, seven jointed, 
scape, pedicellus, 1 anellus, 1 funiculus, and three jointed 
club. Head short and broad, cordiform, almost round, 
eyes rather small, produced, ocelli placed in an obtuse 
angled triangle. Thorax of winged female half the length 
of abdomen, but not broader than abdomen, in the ap- 
terous forms the thorax is less powerfully built. Abdo- 
men sessile, pointed, conical, ovipositor strong, pro- 
‘ duced beyond apex of abdomen to a length equal to 
about two thirds of the entire abdomen. Penis quite 
short, hardly produced beyond apex of abdomen. Legs 
of winged female long and slender, in the apterous forms 
the legs are hardly as long; taken as a whole the apterous 
forms appears to be more powerfully and thicker built 
than the winged females. 
Most probably only one species is found, which ap- 
pears in winged, sub-apterous and apterous females and 
apterous males. 
Prestwichia aquatica Lubbock. 
1863. P. aquatica. Lubbock. Trans. Linn. Soc. Lond. (2) Zool. vol. XXIV. 
1879. — Westwood. Zool. (2) I. p. 587. 
1898. — Dalla Torre. Cat. Hym. V. p. 431. 
1904. _ Ashmead. Classification 1904. p. 359. 
1907. — Schmiedeknecht. Die Hymenopteren Mitteleuropas. 
1909. = Schmiedeknecht. Genera Insectorum. fasc. 97. Chalcid. 
1910. — Ussing. Internat. Rev. ges. Hybrob. u. Hydrol. III. 
120. 
1915. = Wolff. Zeits. f. Forst- und Jagdw. XLVII. p. 566. 
Winged female: Antenne light brown, scape long and 
narrow, almost rectangular, pedicellus long, slightly broa- 
der than, and half as long as scape, anellus small, funi- 
culus hardly half as long as pedicellus, clavus + funicu- 
